Calling all engine gurus-Help w/rough idle, misfire, knock
#12
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Location: Watertown, Wisconsin
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I'm hoping to swap one with a friend who has a 99 GS and see if that makes a difference.
I guess I don't understand misfiring and knocking enough to understand what would be causing so much KR, so many misfires, yet the PCM isn't storing any codes, yet the car is acting funny...
Are any other ICMs compatible other then ones from 3.8s?
I guess I don't understand misfiring and knocking enough to understand what would be causing so much KR, so many misfires, yet the PCM isn't storing any codes, yet the car is acting funny...
Are any other ICMs compatible other then ones from 3.8s?
#16
DINOSAURUS BOOSTUS
Expert Gearhead
Originally Posted by vital49
Don't take this as insult, but have you verified that your plug wires are connected properly? Makes me wonder if you have one crossed.
#17
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Replaced Coil Packs
Practically whenever I am accelerating, I'm getting at least 5' KR, it does frequently hit 9'
These are scans from my morning and afternoon drives to and from work, about 20 miles
Cyl 1 Cyl 2 Cyl 3 Cyl 4 Cyl 5 Cyl 6
530 226 1339 401 68 631
180 0 192 214 0 60
296 27 726 193 90 59
191 0 373 204 91 108
Injectors Swapped
5 6 4 1 3 2
357 102 514 82 0 789
195 6 302 128 59 0
Coil Pack 3/6 Swapped w/ old 1/4 Coil Pack
506 87 543 289 16 102
Practically whenever I am accelerating, I'm getting at least 5' KR, it does frequently hit 9'
These are scans from my morning and afternoon drives to and from work, about 20 miles
Cyl 1 Cyl 2 Cyl 3 Cyl 4 Cyl 5 Cyl 6
530 226 1339 401 68 631
180 0 192 214 0 60
296 27 726 193 90 59
191 0 373 204 91 108
Injectors Swapped
5 6 4 1 3 2
357 102 514 82 0 789
195 6 302 128 59 0
Coil Pack 3/6 Swapped w/ old 1/4 Coil Pack
506 87 543 289 16 102
#18
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And I'm not offended, I'm greatful for the help!
I don't think I have my wires wrong:
Engine:
Back
2--4--6
1--3--5
Front
Coil Packs:
3/6
2/5
1/4
I don't think I have my wires wrong:
Engine:
Back
2--4--6
1--3--5
Front
Coil Packs:
3/6
2/5
1/4
#19
I had a similar problem with my '96 Bonneville SE. Intermittant stalling, surging and sometimes hardstarts but no engine codes!! .
Finally I check my fuel presure regulator by looking at the vacuum line attached to it and saw fuel leaking. Check your Fuel pressure reg. It'* easy and the part is only about $50.
Finally I check my fuel presure regulator by looking at the vacuum line attached to it and saw fuel leaking. Check your Fuel pressure reg. It'* easy and the part is only about $50.
#20
Senior Member
Certified GM nut
misfire
Maybe its not electrical.
could be a dirty maf, IAC, or vacume leak. did you put your O-ring on the PCV?
Water in the fuel was my culprit on the 96 when it wouldn't idle.
Added isopropal gas dryer and it was fixed in 5 min.
could be a dirty maf, IAC, or vacume leak. did you put your O-ring on the PCV?
Water in the fuel was my culprit on the 96 when it wouldn't idle.
Added isopropal gas dryer and it was fixed in 5 min.