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Old 01-12-2011, 01:18 PM
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3800 Series II rough idle and dies

Hi, I have a 2001 Buick Lesabre with the 3800 Series II non-turboed motor. When you start it at both cold or hot operating temps it will immediately start to surge with the RPMs varing from about 300-800ish range and will die in about 10 seconds if you don't give it some gas. This will continue until the RPMs hit about the 1200 range and above that it smoothes out and will run just fine. But, at any time if the RPMs get below the 1200 range it will surge and die. So if you are at a stop light you have to keep 1 foot on the gas and 1 on the brake. It does have the check engine light on with the P131 code: O2 sensor bank 1 sensor 1. I did change it and reset the computer with no improvement and the trouble stayed the same. I have also changed the spark plugs, and the fuel filter.

Any ideas?

Thanks

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Old 01-12-2011, 01:38 PM
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Best engine GM ever made. I had one with 265,000 on it but sold the car because of a broken motor mount. When you reset the computer did you disconnect the battery and leave it disconnected for at least 20 minutes. I had a fuel gauge that would not resister correctly and had a guy try several different units with no luck. I disconnected the battery and let it sit for some time and haven't had a problem since.

I would also try adding some Seafoam to the gas. If it is an injector issue this usually helps.
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Old 01-12-2011, 01:43 PM
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I have only had the car about 2 months but I have run 2 cans of seafoam through it. 1 when I bought it and 1 last week. To reset the codes I took it to a parts store and they reset it using their handheld scanner.
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Old 01-12-2011, 02:04 PM
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Quote:
Originally Posted by sodak1192
I have only had the car about 2 months but I have run 2 cans of seafoam through it. 1 when I bought it and 1 last week. To reset the codes I took it to a parts store and they reset it using their handheld scanner.
What were the codes. Sounds like a vacuum leak
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Old 01-12-2011, 02:27 PM
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The code was P131 same as before changing the O2 sensor.

HO2S Circuit Low Voltage Bank 1 Sensor 1
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Old 01-12-2011, 04:33 PM
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Did you actually check the O2 sensor to see if it was working before you changed it. Could be bad wiring, a bad ECM, mising reference voltage or a missing ground. A graphing scanner will show what the ECM is seeing and if you had a scope you could look to see what the O2 sensor is actually doing.
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Old 01-12-2011, 04:52 PM
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I have to go with a vacuum leak or a bad MAF sensor. Both of them will cause this problem.
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Old 01-12-2011, 04:59 PM
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Did you change the CORRECT sensor? It sounds like a vacuum leak anyhow. Could be injector seals,intake manifold. Chances are it will be on the side of the engine with the affected sensor.Bank one is the side of the engine with cylinder number one in it. Bank one sensor one is the upstream sensor on the side with cylinder one in it.
Just because a oxygen sensor voltage registers as low doesnt mean it is bad, it is actually working if it is registering low, probably doing that to indicate a problem somewhere else.
I see this ALL THE TIME. people get the free code reading at autozone and throw on a part, and it doesnt fix anything.Any time you arent sure you should hire a diagnostic technician(like myself) to diagnose the problem.
A code doesnt mean a bad part necessarily, it is usually a good indication of where to look for the problem.The code description needs to be interpreted well and proper , oxygen sensor voltage allways low is just that, it is allways low.If it registers low it must be working.
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Old 01-13-2011, 06:26 AM
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I got a MAF and went to change it and I discovered a small vacuum line that was disconnected lying a few inches from the MAF. I connected it back up and it runs great. Thanks alot for all your help and suggestions. I guess I must have bumped it the other night when I changed the O2 Sensor.

Thanks,

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