digitaloutsider Posted May 19, 2005 Report Share Posted May 19, 2005 Well, I'm posting this here because it also applies to 3800 Regals. At first, this was a sporadic problem, but it's definitely gotten worse. On idle, the engine will stumble a little bit, and when you rev it up, it stumbles and surges BAD. The car is nearing an undrivable state. There's no power at all at any speed. The plugs are about 4k old. Numerous tanks of gas. What the hell could be the problem? ICM/Coilpacks? Quote Link to comment Share on other sites More sharing options...
maybe2fast Posted May 19, 2005 Report Share Posted May 19, 2005 ICM/Coilpacks? I think you are barking up the right tree Quote Link to comment Share on other sites More sharing options...
glock19 Posted May 19, 2005 Report Share Posted May 19, 2005 I've seen bad plug wires cause this as well. Maybe one was damaged when you replaced the plugs 4k ago. Glock Quote Link to comment Share on other sites More sharing options...
3pt1lumina Posted May 19, 2005 Report Share Posted May 19, 2005 Lazy O2 sensor or bad plug wire, maybe ICM. If it was coilpacks would it act up all of the time?? Sorry, I'm new to DIS ignitions. Quote Link to comment Share on other sites More sharing options...
DiscoStudd Posted May 19, 2005 Report Share Posted May 19, 2005 I'd suspect the crank sensor, as they're known to go out fairly often on the L27 (and it won't throw a code when its bad, either.) You'll have to yank the crank pulley to replace it, and get a special tool to align the new sensor properly on the timing cover. Have you changed the fuel filter lately? They're in a really "fun" spot on the H-Bodies (up under the exhaust tunnel close to the engine...) Quote Link to comment Share on other sites More sharing options...
jdcutty Posted May 19, 2005 Report Share Posted May 19, 2005 I second the crank sensor. I had a mid 80s 3.0 that had a badly aligned crank sensor and it ran like shit. jumping, hisitating, you name it. It eventually slung the belt at about 70mph. No joy in that ride Quote Link to comment Share on other sites More sharing options...
Brian P Posted May 19, 2005 Report Share Posted May 19, 2005 I'm going to 2nd an ignition problem. Check the wires first (my moms car had a problem like that, wires were arcing at the coils) Quote Link to comment Share on other sites More sharing options...
dsgrntld187 Posted May 19, 2005 Report Share Posted May 19, 2005 Definately check the wires. This happened to my Cutlass, and it ended up just being one wire. Quote Link to comment Share on other sites More sharing options...
94CutlassSLCoupe Posted May 19, 2005 Report Share Posted May 19, 2005 I agree sounds like coil packs or plug wires Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted May 19, 2005 Author Report Share Posted May 19, 2005 Okay, it isn't the wires. Still could be the coils/ICM. I haven't changed those yet. It's running so rich, the exhaust smells like just gasoline, nothing else. Quote Link to comment Share on other sites More sharing options...
dsgrntld187 Posted May 19, 2005 Report Share Posted May 19, 2005 Really sounds like the coils/ICM to me Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted May 20, 2005 Author Report Share Posted May 20, 2005 The Bonneville is back in comission. I swapped the coilpacks from my GP and voila! Thanks, guys! Quote Link to comment Share on other sites More sharing options...
99RegalGS Posted May 20, 2005 Report Share Posted May 20, 2005 Glad to hear you got your car running better again Shaun. and get a special tool to align the new sensor properly on the timing cover. Actually the newer 3800 crank sensors do not need that alignment tool. Not sure when they switched to it, but I'm assuing when GM went to the fast start C3 ignition on the 3800's. IIRC that was in 88' for the LN3 I wish I had a pic of the newer Crank sensors, but there is a dowel pin in the front cover and the sensor simply get's put onto the dowl pin, no alighnment nessary. Quote Link to comment Share on other sites More sharing options...
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