96SE - PCM or Injector issue - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-16-2006, 07:00 PM   #11
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Or your voltage issues are causing the misfire.

When was the last time you checked your coolant and oil levels? While I agree with the diagnosis and ideas so far, it'* always wise to check that as well, considering you have the 'vulnerable' drivetrain (L36).
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Old 05-16-2006, 09:06 PM   #12
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ok guys,

Out in the garage to check this out. So far all looks good. I have checked the oil, coolant, battery connections, ground on back side of ecm, altenator, coil pack connections, and I also ohmed out coils. Pack 1-4 = 6.14K, Pack 2-5 = 6.08K, Pack 3-6 = 6.15K. I also have pulled the connector off the end of the ecm and it looks good as well. So far nothing standing out thats say'* it might be the cause. that'* ok...I still need to check connection'* at starter and ground on the engine block. I have the new fuel filter to install as well. thanks for chiming in Willwren. My oil and coolant is fine. Back at it to get the other stuff done. Thanks again guys !
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Old 05-16-2006, 10:29 PM   #13
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Ok guys

All connections checked. All are in very good to great condition. I did not see any corrosion at all. cleaned up battery connections anyway. Replaced fuel filter. All looks good......so the obvious question is.......what next? thanks in advance.

Beemer dude.
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Old 05-16-2006, 10:48 PM   #14
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Quote:
Originally Posted by BMWhound
Ok guys

All connections checked. All are in very good to great condition. I did not see any corrosion at all. cleaned up battery connections anyway. Replaced fuel filter. All looks good......so the obvious question is.......what next? thanks in advance.

Beemer dude.
Ignition wires and/or plugs. Make sure to use GM wires.

Whatever the issue, I think it'* something more conventional as opposed to a PCM problem.

Cheers,
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Old 05-16-2006, 11:14 PM   #15
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We need to get a scantool on the car.
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Old 05-16-2006, 11:24 PM   #16
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Are you talking about a ODB 2 scan tool ?
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Old 05-16-2006, 11:36 PM   #17
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Willwren,

Please advise. I don't have a scan device. In my previous post I have had it scanned twice. Once today when it popped the check engine light, and a week ago when the local mechanic had it. Today it displayed a P0306 code, which I was told by Autozone was a misfire on #6. Last week It showed P0301, and P0305. thanks, but can you lead me a little here. Thanks again everybody !
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Old 05-17-2006, 08:44 AM   #18
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Quote:
Originally Posted by BillBoost37
I'm wondering more along the lines of an ignition control module or bad connections.

From there pull the 3 coils off and check the connection of the ICM (Ignition control module), then clean the mounting plate it sits on and the ground under that mounting plate.

There is a good chance you have a poor connection. Our cars are known to be tempermental when they have dirty connections.
BMW, do this (above) if you would, just to eliminate this as a potential problem.

Then pull the plugs and report their condition to us.

It really doesn't have the symptoms of a plug problem, since your miss is moving cylinders, but it'* a good diagnosis step.
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Old 05-17-2006, 08:49 AM   #19
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Quote:
Originally Posted by willwren
We need to get a scantool on the car.
agreed....there are enough IL members around to help get this thing scanned

oh ya and the Bolts for the Coil packs are a 5.5 mm
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Old 05-17-2006, 09:12 AM   #20
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OK, so I've dug a little deeper to try and get this resolved. Here'* some diagnosis steps as recommended by the '97 FSM. These are basic and should not be any different for your '96. In order of listing:

Sensors/System:

- Check your Heated Oxygen (O2) Sensors. Since you don't have a scantool to check the response times, pull the rear manifold one and look for a white powdery coating (silicone contamination). This contamination can cause a false rich condition signal and cause the PCM to reduce fuel delivery, causing severe driveability problems.

- Check your TPS (Throttle Position Sensor) and related wiring

- Check the MAF Sensor and related wiring. Clean MAF sensor carefully with some alcohol and a cotton swab if dirty.

- Check the EGR valve for a sticking pintle.

Fuel System

- Check the fuel pressure

There'* more, but this is a bunch to do for now.
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