94 Pontiac Missing - Engine Troubleshooting


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94 Pontiac Missing

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

CMQ
User

Feb 19, 2014, 9:01 AM

Post #1 of 3 (1136 views)

94 Pontiac Missing	Sign In

I have a 94 Pontiac with the 3.8L. Had some problems with the ignition control module and coil packs a few months back. Replaced both and fixed the problem for the most part. Plug wires and wiring were all good as well. Missed every once in a while but not constant like it was. Now it's starting to miss again. It's not as drastic as it was the first time. Very subtle almost like driving on a rough road. It doesn't miss if it's in park or neutral and idling or if you rev the motor up. It only does it from around 45mph and up and only if I'm accelerating. Possibly injector or spark plug related?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 19, 2014, 9:11 AM

Post #2 of 3 (1130 views)

Re: 94 Pontiac Missing	Sign In

Plugs and wiring: How did you know they are good? Yes take a look. Are you sure this is engine at all?

Try duplicating roughness/missing just in drive brakes on hard duplicating the load just a bit - don't go nuts and in a safe place. If nothing it may not be engine at all,

T

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 19, 2014, 9:35 AM

Post #3 of 3 (1122 views)

Re: 94 Pontiac Missing	Sign In

Yes, it could be either of those but the first step is identifying which cylinder is doing it and that won't be easy because OBD1 doesn't track misfires.

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