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Old 11-22-2015, 10:04 PM   #1
Melissa45
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1997 buick century electrical issues

My nephew was driving down the road, car suddenly died. Went to take a look at it, gave it a jump, the car turned over, then backfired thru the EGR valve, plus seen the wires heat up, not completely sure if they melted or not.

Got the car back to the house, popped the hood, thinking it is a simple coil pack issue, and would get him rolling again. Since my diagnostics were measured by a multimeter, the results are normal. I pull a plug, hadn't been changed in over 20 years. I change the plugs, check spark, plenty, and no start. Ok, do I have gas, yes. Do I have compression, yes. Crank the car over, seems like it is missing on most cylinders, or wants to start, but doesn't.

Going back to the egr valve, when I pulled it out, it was wet, had some kind of yellowish sludge in it. Bought some break cleaner, cleaned out the ports, and installed a new egr. What the heck is the yellow sludge? Blown intake or this 3.1 engine? Anyone here know what the hell is wrong with it?
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Old 11-23-2015, 03:18 PM   #2
Tech II
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Re: 1997 buick century electrical issues

Sludge? In the EGR?

Is the car losing coolant?

When you pulled all the plugs, outside of being worn, were they wet?

Do you have fuel pressure? Spray carb cleaner into the intake while cranking to see if it starts?
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Old 11-25-2015, 09:55 AM   #3
Melissa45
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Re: 1997 buick century electrical issues

Is the car losing coolant? That was going to be my next guess.

Yes, all the plugs were wet, I presumed it was gas, not sure on coolant, did not see green on the plugs.

Small pool of coolant just above the starter. Not sure where that is coming from.

My last trick will be replacing the 7x crankshaft positioning sensor.

Thanks for the response
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