Question about 1992 GMC Sonoma

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Temp guage barely moves and runs rough just off idle

I have a 1992 Gmc Sonoma with a 2.8 engine with 179000 mi. Very gradually (couple of years) the temp guage has been reading a lower and lower temp. Now it barely moves after warmup. It also has been running progressively rougher just off idle (between 1000 and 2000 rpms) only after warm up. I just replaced the coolant temp sensor thinking that the computer was getting false readings but nothing changed. It accellerates fine, runs down the highway fine and up until lately idled very smooth. Any ideas?

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  • rprkelly Jan 20, 2009

    Thank you for the reply. I did change the thermostat and fuel filter a couple of months ago, plugs and wires about 6 months ago, the O2 sensor a couple of years ago and I've had a K&N filter for years. I've also run fuel injector cleaner through it regularly.

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Check thermostat it could hang open, first check temp. guage, pull off sender wire and ground it for 4 seconds and see if guage moves.

Posted on Jan 18, 2009

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Hi there... try replacing your thermostat if you haven't done so yet. It sounds as if the thermostat is stuck open therefore not allowing the engine to heat up properly. This could also cause your rough running because the O2 sensor is reading a warm engine thorugh the exhaust and sending the message to the computer that the engine is warm. the computer then leans out the system but because the engine isn't actually warm, it starts to run rough. It's just like a carburated vehicle thats cold and starts up without the choke on... it runs rough.

Hope this helps you out

Posted on Jan 18, 2009

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Try a full tune up.. get Bosch platnium+4 spark plugs and Acel wires, do the fuel filter and air filter(i suggest K&N) buy some fuel injector cleaner or use Marvel Mystery oil. The ECU could e gone but hard to diagnose if the car needs a tune up.

Posted on Jan 18, 2009

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