1992 3.8 Bonnie dies when switching to "Closed Loop". HELP - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-17-2009, 08:49 PM   #1
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Default 1992 3.8 Bonnie dies when switching to "Closed Loop". HELP

I have a 1992 SE 3.8 that starts and runs great for about 10 minutes then it instantly dies. Seems to be when it switches to closed loop and if I let it cool down it will start again. Seems to stumble as it'* switching from open to closed loop too.

I still have good spark when it dies and fuel pressure at the rail. Appears that the injectors are shutting off?!

Just installed a new fuel pump, screen and filter. New alternator and battery. Hoping it was a bad fuel pump. Nope. Still stalls when warmed up.

HELP.
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Old 09-17-2009, 08:53 PM   #2
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The car switches from open to closed in about 20 seconds, not 10 mins. I would start with checking the coils. Put a fuel pressure gauge on and watch the pressure, does it change before it dies? If not it'* not the fuel system.
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Old 09-17-2009, 08:57 PM   #3
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Seems to die right at 120-125 degrees. Still have strong spark at the plugs though. Injectors are not firing till the temp gets below 115.

Strange.
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Old 09-17-2009, 09:01 PM   #4
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Could be the engine coolant temp sensor.
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Old 09-17-2009, 09:25 PM   #5
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Ohh yeah.. Had that on another vehicle too. Wouldn't run at all till I tossed a new one in. Heading to the parts store right now. Whee.. $25 fix I hope.

Thanks for the idea!
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Old 09-17-2009, 09:26 PM   #6
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Thank me if it fixes the problem
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Old 09-18-2009, 12:00 AM   #7
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AUGH. According to the folks at the parts store, someone changed my wiring harness at some point. They keep selling me a 2 wire temp sensor and mine is a single wire. No other sender is listed other than the 2 wire one. Mine only has one green/yellow wire in the loom going to it AND it has a different layout of the pins. Gotta wait till tomorrow and try the (*)tealership I guess. Lame.
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Old 09-18-2009, 07:58 AM   #8
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Not necessarily on the wiring harness. Check your drivers door sticker for the production date of your car. You might have one of the first 92'*. If so you may need 91 sensors.

If you know it'* an open/closed loop problem, the pcm may be the issue. I've seen a couple 92'* exhibit very odd problems that caused hair to be pulled out and as a final try the pcm was swapped, cured the issues.


Dan.. take a look in your HPT and see what temp we switch between open and closed loop. It can't be 20 seconds because it'* somewhere around 120 degrees. My car doesn't heat up quite that fast.
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Old 09-18-2009, 08:21 AM   #9
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That'* about 75* Bill
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Old 09-18-2009, 09:51 AM   #10
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Doesn't sound right.
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