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#1
11-09-2004, 11:09 AM
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94 GS won't idle
I have a 94 GS 3.8. Runs fine except on occasion it cuts out when driving, and when I stop. On the occasions when stopped,it will surge as the tach needle goes up and down then it stalls. I can smell that it is running rich, and mileage is only 21 mpg, vs my Monte Carlo with the same 3.8 -27 mpg. I changed the thermostat, pump relay, plugs are ok. Car starts right back up, and will run fine for a while. Does it in winter, and summer. Won't throw a code. Any ideas? I don't want to get into hanging parts.
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#2
11-10-2004, 12:19 AM
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Re: 94 GS won't idle
remove the O2 sensor and check for carbon build-up, if there is it needs replaced
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#3
11-12-2004, 01:50 PM
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Thanks, I'll try that. Looks like there are two of them. Is it possible to clean them instead of replacing?
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#4
11-13-2004, 07:54 PM
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Re: 94 GS won't idle
no, they will work even worse, they would need replaced if that is the problem.
if they are good the next step is i would check the timing.
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#5
11-14-2004, 01:05 AM
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It is impossible to check or adjust the timing because this engine (Vin L 3800 V6) has an electronically controlled distributorless ignition system. I would check your Mass Air Flow Sensor to see if the filaments are dirty. I might also suspect a bad Coolant temp sensor.
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#6
11-14-2004, 01:12 AM
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Re: 94 GS won't idle
impossible to adjust? yes. impossible to test? no. if the timing is off it indicates a bad sensor input.
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