94'bonnie se non turbo running very erratic . - 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 08-19-2016, 01:41 PM   #1
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Default 94'bonnie se non turbo running very erratic .

166k mileage 3.8 L.when i first got the car back on the road again for the 2nd or 3rd time last summer and while i had the tranny problem it would stall when coming to a light from highway or street driving as if it just loses it'* signal.this doesn't happen anymore.i got codes :p1406-egr pintle position,p1561- cruise control vent solenoid(cruise never worked) and,p0300-misfire detected..the first and easiest thing to do was change the plugs and wires.this had no effect it still ran a little rough and the check engine light still came on.so i swapped them all back out and got my money back.when i start the car it starts right up but runs slightly rough and fluctuating a bit.when i put the car into drive and slightly put my foot on the gas to drive 5-10 mph it bucks and lunges.if i put my foot on pedal to take off it skips once and takes off.if i'm at highway speed and want to maintain that speed i feel it lunging a bit as if it'* missing slightly.same goes for street speed where it is more noticeable at missing.i know what a misfire feels like from not firing a plug, i had that happen weeks ago when one of the plug wires melted against the exhaust.this feels different.i checked with a dummy light tester the tps and the lights show a smooth slide up the scale.to me it feels like a bad tps but i'm not sure.the check engine light comes on more frequently now than it did in the past..it always comes on when it'* foggy or raining now. i cleaned the maf and the iac sensors weeks ago with the special cleaner,no change...any ideas?thanks
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Old 08-20-2016, 08:08 AM   #2
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Who in the world, puts in new plugs and wires, and then takes them back out?

Did you do a coil output check?

Check compression while you had the plugs out?

I believe for that year, a high end scan tool, like a Tech II, can detect which cylinder is misfiring.......

Can you make it misfire in the bay, in drive, under a load with brake on?
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Old 08-20-2016, 08:50 AM   #3
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Is the P1406 code still around? This can cause a whole world of issues (these included) if the EGR is stuck open. It'* essentially a massive vacuum leak that is sucking exhaust uncontrolled. If it is still popping that code, pull the EGR and have a look.

It doesn't take much to pull misfire data on this gen. I can view misfire data on my Actron CP9145. If you can scan live data, you can immediately rule out TPS issues, because the TPS data will show on the scanner. It'* how I spotted a bad TPS causing shifting issues on the PA, even before it started popping TPS related codes.
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