EPA-AA-TAEB-80-3
Results of Inspection/Maintenance Catalyst
Tests on a 1975 Dodge Dart
December 1979
by
Edward Anthony Earth
Technology Assessment and Evaluation Branch
Emission Control Technology Division
Office of Mobile Source Air Pollution Control
Environmental Protection Agency
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-2-
Abstract
The purpose of the test program was to determine whether or not a car
with an inactive catalyst could be made to pass I/M short tests through
maladjustment of the engine idle mixture, idle speed, and initial
timing. Exhaust emissions and temperatures were both measured for each
maladjustment. The Federal Three Mode and Two Speed Idle Test were run
for each vehicle test condition.
In addition, the potential of catalyst diagnostic tests was investi-
gated. For these tests the effect of disconnecting the air pump or a
spark plug on exhaust emissions and temperatures was determined. These
tests were performed in conjunction with the above emission and temper-
ature mapping.
This report presents the measured data of a short program designed to
determine the ability of existing I/M scenarios to detect an inactive
catalyst.
Background
As the Inspection/Maintenance effort is expanded, it becomes more im-
portant that the test procedures be able to reliably and quickly detect
failed vehicle catalysts.
Because of the relatively high cost of replacing a catalyst, there is
the possibility that, rather than replacing the catalyst, attempts will
be made to fool the I/M short tests through judicious maladjustments of
the engine. Idle mixture, idle speed, and initial timing changes can
easily be made on many vehicles. Adjusting these engine parameters
could potentially allow a failed vehicle to pass I/M short tests even
though the vehicle's actual emissions would cause it to fail the Federal
Test Procedure.
In order to gain some experience with these problems prior to under-
taking any larger efforts, this small test program was undertaken. This
report presents the data on one vehicle.
Test Vehicle Description
A 1975 Dodge Dart, with a California emissions control system, was
adjusted to manufacturer's specifications. This vehicle is an inline 6
cylinder with air pump, catalyst, and EGR for emission control. A more
complete description of the vehicle is given in the test vehicle des-
cription in the Appendix.
Thermocouples were installed before and after the catalyst to measure
exhaust pipe skin temperature. Several thermocouples were installed.
The data presented here are for the thermocouples installed 1 1/2 inches
from the junction of the catalyst cone with the exhaust pipe.
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-3-
Raw exhaust taps were also installed immediately before and after the
catalyst.
Test Procedures
The vehicle was tested using the Federal Three Mode (F3M) and Two Speed
idle test procedures. Also, there was one hot LA-4 to evaluate the
overall emission control of the baseline vehicle. Except for the LA-4,
all tests were raw vehicle exhaust samples. The F3M consisted of high
speed (52 mph, at 16.0 actual horsepower), low speed (25 mph at 7.5
actual horsepower), idle drive, and idle neutral test. The vehicle hood
was open and the auxiliary fan was on for these tests.
The Two Speed idle consisted of a 2500 rpm neutral and an idle neutral
test. The vehicle hood was closed and the auxiliary fan was off for
these tests.
The vehicle was tested in stock configuration, with one sparkplug dis-
connected, with the air pump disconnected, and with a combination of
these. The complete test sequence matrix was:
Vehicle Configuration
1 Plug Air Pump 1 Plug and Air Pump
Stock Disconnected Disconnected Disconnected
F3M X X
2 Speed XX X X
(A sample test data sheet is contained in the Appendix)i
The vehicle was initially tested with the idle mixture, idle speed, and
timing set to the manufacturers specifications. The engine CO was also
measured by taking CO values before the catalyst with the air pump
disconnected while the engine idled.
To avoid confusion with the other CO measurements, the before the cata-
lyst engine CO measurements taken with the air pump disconnected and the
engine at idle, will be called "reference CO" values.
While maintaining idle speed, the mixture screw was leaned out until
engine misfire occurred. (Misfire was defined as the point at which a
rapid increase in HC emissions occurred with little increase in CO
emissions). The engine was then adjusted rich until misfire just
ceased. This was the lean reference CO setting.
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-4-
Tests were then run at two intermediate reference CO values between the
stock reference CO and lean reference CO values. The vehicle was also
tested at the lean reference CO setting.
Idle rpm Changes
The preceding mixture procedure was repeated with the idle rpm set to
stock idle rpm +100 rpm and then stock idle rpm +200 rpm.
Timing Changes
The preceding mixture procedure was repeated with the timing retarded
both 5° and 10° from stock.
For all before and after catalyst measurements, the HC and CO concen-
trations were measured with a Sun Analyzer Model EPA-75.
Test Results
The test results are tabulated in the six tables following. The data is
presented with no attempts made to analyze the data. A few test obser-
vations are noted below:
The before and after catalyst skin temperatures were very sensitive
to thermocouple location. Skin temperatures typically increased
6-8° per inch for each inch upstream of the catalyst. Similarily,
skin temperatures typically decreased 6-8° per inch for each inch
downstream of the catalyst. Also, upstream and downstream tempera-
tures were nearly identical under most test conditions.
The vehicle was equipped with a ported spark advance. Therefore,
the 100 and 200 rpm idle speed changes would cause changes in idle
timing for some conditions as the throttle plate was opened for
higher idle speeds.
The Federal Three Mode idle in neutral test many times gave dif-
ferent emission values than the Two Speed idle in neutral test.
This difference is attributable to the hood being open, fan on, for
the Federal Three Mode and the hood being closed, fan off, for the
Two Speed Idle Tests
The Federal Three Mode idle neutral test with the air pump dis-
connected should have given results identical to the reference CO
value for the given test. Often this did not happen and is attri-
butable to the vehicle engine compartment temperature increasing
throughout a given test sequence.
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-5-
TEST VEHICLE DESCRIPTION
Chassis model year/make - 1975 Dodge Dart
Emission control system - Air Pump, Catalyst EGR
Engine
type Inline 6, 4 cycle
bore x stroke 3.40 X 4.125 in.
displacement 225 CID/3687 cc
compression ratio 8.4:1
fuel metering 1 Venturi, carburetor
fuel requirement ..... unleaded, tested with
Indolene HO unleaded
Drive Train
transmission type 3 speed automatic
Chassis
type 4 door sedan
tire size D78 X 14
inertia weight 3500 Ibs.
passenger capacity 6
Emission Control System
basic type air pump
catalyst
EGR
calibrated to 1975
California standards
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-6-
I/M CATALYST TESTING: RAW EXHAUST HC, CO, TEMPERATURE DATA SHEET
Technicians:
Test No.
Dyno 004 Baseline
Timing
Set 1750 Ibs. IW
FEDERAL THREE MODE
hood OPEN fan ON,
set IHP (d 52 mph
52 mph - max. 3 min.
set IHP(d 25 mph
25 mph — max. 3 min.
Idle (drive)
Idle (N)
TWO SPEED IDLE:
hood CLOSED, fan OFF
2500 + 100 rpm
Idle (N>
Disconnect plus wire
TWO SPEED IDLE
2500 + 100 rpm
Idle (N)
Disconnect air pump and
plug supply line
TWO SPEED IDLE
2500 + 100 rpm
Idle (N)
Connect plug wire
FEDERAL THREE MODE
hood OPEN, fan ON
set IHP @ 52 mph
52 mph - max. 3 min.
set IHP @ 25 mph
25 mph - max. 3 min.
Idle (drive)
Idle (N)
TWO SPEED
hood CLOSED, fan OFF
2500 + 100 rpm (N)
Idle (N)
unplug supply line and
connect air prmp
Other
Date
Idle Mixture
Idle RPM
Before Catalyst
HC CO Temt
After Catalyst
HC CO Ternr
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock + 100 RPM
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 RPM
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
15A 10° Retard (3)
Percent
CO
1.9%
1.10%
.4%
.25%
.35%
1.10%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
750 (N)
750 (N)
750(N)
750(N)
850(N)
850 (N)
850 (N)
850 (N)
950(N)
950 (N)
950(N)
950 (N)
750(N)
750 (N)
640 (N)
750(N)
590(N)
750(N)
750(N)
750(N)
Table I
I/M Catalyst Testing
HC Before Catalyst ppm
Federal Three Mode
52 mph
55
50
50
42
50
50
50
60
50
50
52
45
60
42
40
30
40
40
50
18
25 mph
60
50
60
50
50
50
50
55
50
55
60
50
65
50
55
50
40
48
65
60
Idle
Drive
52
35
40
30
38
40
40
60
40
45
49
40
58
25
30
35
20
30
55
35
Idle
Neutral
28
20
25
20-80
30
60
120
175
20
30
30
30
30
20' /
50
125
35
30
150
75
Two Speed Idle
Idle
Drive
60
80
80
60-90
80
70
75
70
70
70
75
55
80
50
60
75
60
60
70
100
Idle
Neutral
33
20
30
25
35
80
60
120
20
25
30
40
35
20
30
90
15
25
120
40
Two Speed Idle
Plug Disconnected
Idle
Drive
1360
1340
1380
1360
1380
1380
1380
1350
1370
1390
1360
1330
1420
1390
1400
1480
1440
1380
1430
1440
Idle
Neutral
1580
1580
1530
1460
1490
1510
1440
1430
1400
1440
1420
1400
1730
1630
1630
1680
1650
1540
1410
1650
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno H? set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock + 100 RPM
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Intermediate
9 Stock + 200 RPM
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10" Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A. 5° Retard (2)
15A 10° Retard (3)
Percent
CO
1.0%
.75%
.60%
.48%
1.9%
1.1%
.4%
.25%
.35
1.1%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
750(N)
750 (N)
750(N)
750 (N)
850 (N)
850 (N)
850 (N)
850(N)
950(N)
950 (N)
950 (N)
950 (N)
750(N)
750 (N)
640(N)
750(N)
590(N)
750 (N)
750(N)
750 (N)
Table I (cont)
I/M Catalyst Testing
HC Before Catalyst ppm
Two Speed Idle
Plug & Air Pump Disconnected
Federal Three Mode
Idle
Drive
1800
1970
1900
1940
2000
1950
2000
2000
1970
1910
1940
1900
2000
2000
2000
2000
2000
2000
2000
2000
Idle
Neutral
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
2000
Air Pump Disconnected
52 mph
100
90
100
85
100
115
115
90
85
90
82
85
125
90
80
100
70
80
95
85
25 mph
90
80
88
85
90
90
90
80
75
85
72
80
90
75
70
75
70
75
82
80
Idle
Drive
145
100
110
68
88
85
100
75
100
95
100
100
140
85
70
100
65
90
—
90
Idle
Neutral
120
75
80
60
180
175
130
250
80
100
70
225
110
125
80
150
150
90
—
150
Two Speed Idle
• Pump D]
Idle
Drive
140
140
75
130
120
120
130
140
90
100
100
110
150
100
110
100
100
100
100
120
Lsconnectei
Idle
Neutral
125
85
90
50
110
80
140
210
75/70
120
75
175
115
100
150
70
120
80
150
120
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
i 5 Stock + 100 RPM
i 8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Intermediate
9 Stock + 200 RPM
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
Percent
CO
1.9%
1.1%
.25%
.35
1.1%
.25%
1.15%
RPM
750(N)
750(N)
640(N)
750(N)
590(N)
750(N)
750(N)
750 (N)
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
Table II
I/M Catalyst Testing
CO Before Catalyst in %
Federal Three Mode
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
750(N)
750(N)
750 (N)
750 (N)
850 (N)
850 (N)
850 (N)
850 (N)
950(N)
950(N)
950(N)
950 (N)
.1
.1
.09
.09
.09
.09
.09
.08
.07
.08
.09
.08
52 mph
.1
.1
.09
.09
.09
.09
.09
.08
.07
.08
.09
.08
.09
.1
.1
.13
.10
.11
.10
.12
25 mph
.08
.09
.08
.09
.08
.08
.08
.08
.07
.07
.OS
.08
.09
.09
.09
.12
.10
.09
.10
.10
Idle
Drive
.87
.30
.22
.10
.28
.20
.12
.10
.29
.21
.20
.13
.62
.45
.16
.38
.15
.37
.11
.43
Idle
Neutral
.48
.20
.17
.12
.19
.17
.14
.15
.18
.16
.17
.13
.36
.30
.13
.30
.12
.23
.13
.32
Two Speed Idle
Idle Idle
Drive Neutral
12
13
12
13
13
12
12
13
12
11
13
11
.61
.27
.24
.12
.27
.20
.18
.16
.20
.17
.20
.14
.13
.12
.13
.17
.13
.13
.15
.16
.42
.38
.15
.25
.18
.28
.15
.40
Two Speed Idle
Plug Di
Idle
Drive
.12
.10
.10
.11
.10
.10
.11
.11
.10
.09
.11
.10
.11
.11
.10
.14
.12
.13
.12
.13
sconnecte
Idle
Neutral
.47
.22
.21
.10
.21
.19
.17
.11
.20
.15
.18 '
.15
.39
.22
.13
.25
.15
.25
.12
.30
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock + 100 RPM
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Intermediate
9 Stock +200 RPM
12 -HLean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
15A 10° Retard (3)
Percent
CO
1.9%
1.1%
.4%
.25%
.35
1.1%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
750 (N)
750(N)
750(N)
750(N)
850 (N)
850(N)
850 (N)
850 (N)
950 (N)
950(N)
950(N)
950(N)
750 (N)
750(N)
640 (N)
750(N)
590(N)
750(N)
750(N)
750(N)
Table II (cont.)
I/M Catalyst Testing
CO Before Catalyst in %
Two Speed Idle
Air Pump
Idle
Drive
.20
.20
.20
.19
.20
.18
.21
.20
.17
.17
.19
.18
.20
.23
.23
.25
.20
.21
.21
.22
Disconne
Idle
Neutral
2.1
.69
1.0
.25
.55
.65
.35
.31
.90
.55
.90
.55
1.55
1.06
.31
.80
.33
.70
.23
1.10
Federal Three Mode
Air
52 mph
.14
.12
.15
.12'
.13
.12
.12
.12
.11
.11
.13
.12
.12
.14
.13
.20
.16
.15
.16
.18
Pump
25 m;
2.1
.12
.12
.12
.13
.11
.12
.12
.11
.11
.12
.12
.12
.14
.15
.17
.17
.15
.14
.16
Disconnected
Idle
>h Drive
2.1
1.0
.85
.16
.50
.30
.40
.14
.80
.50
.80
.28
2.00
.95
.21
1.18
.31
.70
1.00
Idle
Neutral
2.0
. .93
.92
.23
.70
.45
.50
.20
.90
.60
.90
.38
1.90
.95
.25
.80
.35
.75
1.05
Two Speed Idle
Air Pump Disconnected
Idle Idle
Drive Neutral
.24
.24
.25
.25
.22
.23
.22
.22
.23
.22
.22
.28
.25
.25
.25
.26
2.6
1.4
1.3
.38
.80
.60
.75
.40
.22 1.25/.70
.20 .80
.20 1.25
.21 .50
2.30
1.25
.30
1.05
.48
1.0
.45
1.10
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
Percent
CO
1.9%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
..75%
.60
.48%
750 (N)
750 (N)
750 (N)
750 (N)
850 (N)
850 (N)
850 (N)
850 (N)
950(N)
950 (N)
950(N)
950 (N)
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate.
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
15A 10° Retard (3)
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
750(N)
1.10%
.4%
.25%
.35%
1.10
.25%
1.15%
750 (N)
640(N)
750(N)
590(N)
750 (N)
750(N)
750(N)
Table III
I/M Catalyst Testing
Temperature Before Catalyst in °F
Federal Three Mode
Idle
Drive
Idle
Neutral
Two Speed Idle
Idle Idle
Drive Neutral
Two Speed Idle
610
600
650
685
630
660
635
640
625
643
658
740
640
630
625
640
640
650
640
625
610
620
600
660
580
590
565
585
570
565
575
570
560
570
540
560
512
500
510
510
500
505
500
500
500
520
490
478
580
550
540
570
590
570
560
580
600
580
560
560
570
550
555
550
550
535
535
535
570
560
520
525
630
615
557
485
565
510
675
748
815
805
695
635
791
650
649
820
735
640
612
650
568
569
740
627
550
553
609
510
487
576
545
500
496
s™
571
575
620
656
588
515
612
550
540
550
617
561
528
578
Plug Di
Idle
Drive
540
550
555
560
565
560
565
560
565
555
530
550
515
555
568
580
632
579
536
589
sconnecte
Idle
Neutral
515
520
525
520
505
500
545
515
500
520
472
500
479
491
530
502
552
525
485
528
-------
Test Number Test Configuration
Percent
CO
RPM
Table III (cont.)
I/M Catalyst Testing
Temperature Before Catalyst In °F
Two Speed Idle
Plug & Air Pump Disconnected
Idle
Neutral
Federal Three Mode
Air Pump Disconnected
Idle Idle
Drive Neutral
Two Speed Idle
Air Pump Disconnected
Idle Idle
Drive Neutral
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60
.48%
750(N)
750(N)
750 (N)
750(N)
850 (N)
850 (N)
850 (N)
850(N)
950 (N)
950(N)
950 (N)
950(N)
1.9%
1.10%
.4%
.25%
.35%
1.10
.25%
1.15%
750(N)
750(N)
640 (N)
750(N)
590 (N)
750(N)
750 (N)
750(N)
520
520
515
550
550
520
530
520
530
530
500
510
507
520
535
550
590
535
505
560
505
510
520
510
540
535
525
500
500
490
500
499
511
489
515
540
525
470
510
620
620
600
660
670
630
630
630
630
655
645
605
640
719
730
740
633
450
757
640
650
630
630
650
650
640
625
650
620
615
642
647
671
749
755
669
420
700
580
600
550
580
560
550
590
540
540
532
530
499
515
602
620
637
610
582
495
480
480
500
490
510
500
515
480
500
482
465
435
455
482
512
542
510
500
545
570
550
540
575
560
580
590
628
562
540
566
558
590
610
595
550
588
600
540
540
540
540
530
530
530
525/480
530
527
500
522
507
509
575
570
549
537
520
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10" Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
15A 10° Retard (3)
Percent
CO
1.9%
1.10%
.4%
.25%
.35%
1.10%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60
.48%
750(N)
750 (N)
750(N)
750 (N)
850 (N)
850(N)
850 (N)
850 (N)
950(N)
950 (N)
950(N)
950(N)
750 (N)
750(N)
640(N)
750(N)
590(N)
750 (N)
750(N)
750 (N)
Table IV
I/M Catalyst
HC After Catalyst ppm
Federal Three Mode
52 mph
25
20
20
12
20
15
15
30
12
22
25
19
30
20
18
20
5
15
15
8
25 mph
28
15
20
12
15
12
12
15
15
20
25
15
30
10
20
20
20
12
20
20
Idle
Drive
22
10
15
10
10
10
10
20
10
20
20
12
25
10
15
22
15
10
20
18
Idle
Neutral
20
10
10
10
10
10
10
20
9
15
15
9
18
15
5
25
15
12
30
20
Two Speed Idle
Idle Idle
Drive Neutral
28
20
20
18
12
20
15
20
15
22
25
10
20
10
15
10
10
10
10
20
8
10
20
9
32
10
10
30
10
15
20
25
20
10
12
15
10
12
25
20
Two Speed Idle
Plug Di
Idle
Drive
190
190
200
90
180
190
180
170
180
180
190
180
200
200
200
220
200
180
180
220
sconnectei
Idle
Neutral
100
70
100
70
100
100
80
120
100
120
100
80
100
150
120
150
120
90
100
140
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
/
13A 5° Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
1.9%
1.10%
.4%
.25%
.35%
1.10%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60
.48%
750(N)
750 (N)
750(N)
750(N)
850 (N)
850 (N)
850(N)
850 (N)
950(N)
950 (N)
950(N)
950 (N)
750(N)
750(N)
640(N)
750(N)
590(N)
750 (N)
750(N)
750(N)
Table IV (cont.)
I/M Catalyst
HC After Catalyst ppm
Two Speed Idle
Plug & Air Pump Disconnected
Federal Three Mode
Idle
Drive
210
220
200
210
240
240
220
220
230
200
220
200
360
Idle
Neutral
1090
170
500
170
120
200
160
100
300
140
300
140
760
Air Pump Disconnected
Idle Idle
25 mph Drive Neutral
50
35
42
35
42
50
45
30
30
40
35
40
40
40
30
40
30
30
35
30
25
28
35
30
30
35
270
260
310
240
260
280
300
380
140
220
140
200
160
220
48
35
55
30
35
45
30
32
30
40
25
30
35
40
65
30
85
15
35
—
80
50
30
45
20
30
—
70
Two Speed Idle
• Pump
Idle
Drive
35
30
30
28
30
30
25
25
25
30
25
25
40
30
22
35
20
30
30
35
Disconne
Idle
Neutral
130
80
88
20
25
25
20
20
80/20
25
65
25
120
60
28
40
10
40
30
55
(iy Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
Percent
CO
1.9%
1.10%
.40%
.25%
.35%
1.10%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
750 (N)
750 (N)
750(N)
750 (N)
850 (N)
850 (N)
850(N)
850 (N)
950(N)
950 (N)
950(N)
950 (N)
750(N)
750(N)
640(N)
750(N)
590(N)
750(N)
75U(.N)
750 (N)
Table V
I/M Catalyst Testing
CO After Catalyst in %
Federal Three Mode
52 mph
.02
.01
.01
.01
.01
.01
.01
.01
.01
.01
.02
.005
.01
.01
.01
.02
.005
.01
.01
.02
25 mph
.01
.01
.01
.005
.005
.01
.01
.005
.005
.005
.02
.005
.01
.01
.01
.02
.005
.01
.01
.01
Idle
Drive
.02
.01
.01
.005
.01
.01
.01
.005
.01
.005
.02
.005
.01
.01
.01
.02
.005
.01
.01
.01
Idle
Neutral
.02
.01
.005
.005
.005
.01
.01
.005
.01
.005
.02
.005
.01
.005
.01
.02
.005
.01
.01
.01
Two Speed Idle
Idle Idle
Drive Neutral
,01
01
005
005
005
01
01
005
01
005
02
005
.02
.01
.005
.005
.005
.01
.01
.005
.005
.005
.02
.005
.01
.005
.01
.02
.005
.01
.01
.01
.01
.005
.01
.02
.005
.01
.01
.01
Two Speed Idle
Plug Di
Idle
Drive
.02
.01
.01
.02
.01
.01
.01
.01
.01
.005
.02
.01
.01
.01
.02
.02
.01
.02
.02
.02
sconnecte.
Idle
Neutral
.01
.01
.01
.01
.005
.01
.01
.005
.01
.005
.02
.01
.01
.01
.01
.02
.005
.01
.02
.02
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Table V (cont.)
I/M Catalyst Testing
CO After Catalyst in %
Test Number Test Configuration
1 Stock
4. +Lean Intermediate
3 +Lean Intermediate
2 +Lean.Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
15A 10° Retard (3)
Percent
CO
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
RPM
750 (N.)
750 (N)
750(N)
750(N)
850(N)
850(N)
850(N)
850(N)
950(N)
950 (N)
950 (N)
950 (N)
1.9%
1.10%
.40%
.25%
.35%
1.10%
.25%
1.15%
750(N)
750 (N)
640(N)
750(N)
590(N)
750(N)
750(N)
750(N)
Two Speed Idle
Plug 5,
Federal Three Mode
Air Pump
Idle
Drive
.02
.02
.01
.02
.02
.02
.02
.02
.02
.02
.03
.02
.02
.01
.02
.02
.01
.02
.02
.02
Disconne
Idle
Neutral
.37
.02
.10
.01
.01
.01
.01
.01
.18
.01
.12
.02
.23
.09
.02
.02
.01
.02
.02
.02
Air Pump Disconnected
52 mph
.02
.02
.01
.01
.01
.01
.01
.01
.01
.005
.02
.01
.01
.01
.02
.02
.01
.02
.02
.02
25 mph
.02
.02
.01
.01
.01
.01
.01
.01
.01
.005
.02
.01
.01
.01
.02
.02
.005
.02
.02
.02
Idle
Drive
1.8
.40
.25
.01
.01
.01
.01
.01
.27
.01
.22
.01
1.65
.31
.02
.61
.01
.03
.55
Idle
Neutral
1.6
.30
.38
.01
.01
.01
.01
.01
.50
.01
.32
.01
1.60
.30
.02
.02
.005
.02
.45
Two Speed Idle
1 Pump
Idle
Drive
.02
.02
.01
.01
.01
.01
.01
.01
.01
.005
.02
.01
.01
.01
.02
.02
.01
.02
.02
.02
Discpnnec
Idle
Neutral
1.8
.80
.71
.01
.01
.01
.01
.01
.60/.01
.01
.72
.or
1.90
.50
.0
.19
.005
.10
.02
.22
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5° Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
Percent
CO
1.9%
1.10%
.4%
.25%
.35%
1.10%
.25%
1.15%
RPM
1.8%
1.3%
.75%
.01%
1.0%
.75%
.55%
.35%
1.0%
.75%
.60%
.48%
750 (N)
750 (N)
750(N)
750 (N)
850(N)
850 (N)
850 (N)
850 (N)
950(N)
950 (N)
950 (N)
950(N)
750(N)
750 (N)
640(N)
750(N)
590(N)
750 (N)
750(N)
750(N)
Table VI
I/M Catalyst Test
Temperature After Catalyst in "F
Federal Three Mode
52 mph
590
620
630
670
665
660
650
660
640
652
648
712
652
657
720
732
762
660
630
810
25 mph
620
630
590
630
630
630
620
610
600
618
595
628
610
630
634
800
699
632
602
699
Idle
Drive
545
540
530
560
530
535
550
530
535
545
520
520
538
550
538
675
600
545
543
591
Idle
Neutral
538
590
4.95
490
475
590
480
485
485
515
480
467
502
510
479
572
530
509
492
518
Two Speed Idle
Idle Idle
Drive Neutral
612
600
570
600
610
590
600
590
600
606
542
550
579
605
595
620
651
592
570
621
552
555
550
540
540
525
520
540
540
530
500
500
532
555
549
550
585
568
508
568
Two Speed Idle
Plug D
Idle
Drive
786
790
750
800
780
790
800
800
745
780
730
760
760
782
763
816
812
789
771
793
isconnect
Idle
Neutral
735
700
690
480
710.
700
725
690
685
705
652
670
692
700
702
709
739
720
670
729
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
-------
c
O
Z
m
-4
5
z
o
Table VI (cont.)
I/M Catalyst Testing
Temperature After Catalyst In °F
vo
00
o
I
Test Number Test Configuration
1 Stock
4 +Lean Intermediate
3 +Lean Intermediate
2 +Lean Limit
5 Stock +100 rpm
8 +Lean Intermediate
7 ' +Lean Intermediate
6 +Lean Limit
9 Stock +200 rpm
12 +Lean Intermediate
11 +Lean Intermediate
10 +Lean Limit
12.5 Stock
13 5° Retard
14 +Lean Intermediate
15 10° Retard
16 +Lean Intermediate
13A 5e Retard (1)
14A 5° Retard (2)
ISA 10° Retard (3)
Two Speed Idle
Federal Three Mode
Percent
CO
1.8%
r.3%
.751
.01%
1.0%
.75%
.55%
.352
1.0%
.75%
.60%
.48%
RPM
750(N)
750 (N)
750 (N)
750(N)
850 (N)
850(N)
-850(N)
850 (N)
950 (N)
950 (N)
950(N)
950 (N)
1.9%
1.10%
.4%
.25%
.35%
1.10%
.25%
1.15%
750(N)
750 (N)
640(N)
750 (N)
590(N)
750 (N)
750(N)
750 (N)
Air Pump
Idle
Drive
845
845
825
800
860
630
860
840
835
838
815
820
825
820
837
861
865
837
798
851
Dlsconne
Idle
Neutral
750
770
760
760
795
_
780
775
755
780
750
760
735
752
775
770
758
773
725
758
Air Pump Disconnected
52 mph
600
700
670
685
700
—
700
680
660
692
660
668
678
700
715
740
748
690
550
749
25 mph
610
650
630
630
650
__
640
645
620
645
620
618
629
646
660
718
733
676
415
685
Idle
Drive
575
570
550
560
560
___
560
580
565
580
550
550
523
542
580
609
630
592
_— —
602
Idle
Neutral
510
500
510
500
525
540
520
510
540
530
510
510
470
' 499
497
540
552
555
__
520
Two Speed Idle
Air Pump Disconnected
Idle Idle
Drive Neutral
570
580
540
550
595
580
590
580
600
580
530
570
562
570
605
650
562
587
592
565
570
560
575
580
570
565
525/540
575
520
543
559
568
532
585
595
579
550
609
(1) Maintaining idle speed caused vacuum spark advance.
(2) Maintaining idle speed caused vacuum spark advance.
(3) Dyno hp set 2 hp high.
------- |