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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

1995 buick century 3100 wagon

  • cheryl hartkorn
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8 years 10 months ago #3271 by cheryl hartkorn
1995 buick century 3100 wagon was created by cheryl hartkorn
looking for a wiring diagram for the check engine light control. cranks but no start. no mil on during koeo customer said it worked yesterday

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  • Noah
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8 years 10 months ago #3273 by Noah
Replied by Noah on topic 1995 buick century 3100 wagon
"Ground cannot be checked with a 10mm socket"
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8 years 10 months ago #3278 by Tyler
Replied by Tyler on topic 1995 buick century 3100 wagon
Nice, Noah! I went looking for this last night, only found the instrument cluster side of it.

Also, I really appreciate GM OE diagrams like this B) Love seeing the internals, even if they're simplified.

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8 years 10 months ago #3281 by cheryl hartkorn
Replied by cheryl hartkorn on topic 1995 buick century 3100 wagon
customer put a lower intake gasket on. it was leaking. and he said it stalled out. we got spark and fuel pressure by pressing the Schrader valve. don't know how much it was on the side of the road. but has no check engine light on key on. he said it always worked before. thing looks brand new. how would it have spark and pressure if the computer really was dead? haven't checked for 5 volt ref yet ill do that monday

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8 years 10 months ago #3283 by Tyler
Replied by Tyler on topic 1995 buick century 3100 wagon

cheryl hartkorn wrote: how would it have spark and pressure if the computer really was dead?


Bypass ignition for the spark? The fuel pressure, not sure... Maybe it was still holding pressure from before the stall? Or, did you depress the valve during cranking?

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8 years 10 months ago #3285 by Noah
Replied by Noah on topic 1995 buick century 3100 wagon
I've seen a few obd1 cars where the cel is inoperative but the pcm isn't necisarily dead.
"Ground cannot be checked with a 10mm socket"

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