Lumina 3800 V6 issues

I have a 95 lumina 3800. Lately it stutters while driving like a missfire...gotten worse lately.. THEN today start it up and it idles like new for 1 min ...then idles up and down like an idiot from 200rpm to 1300 for about 10 seconds and idles out fine then starts back up in the idles surges.. What would cause this.. I replaced all the plugs, fuel filter, air filter oil etc as it was required. I tried the paper clip scan but this stupid thing has the weird OBD I scan plug that can't be doen with typical OBD I gm scanners ($19 at parts store) so I can't scan it to see what it's problem is. Thanx for your time

Reply to
Chevrolet
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Reply to
Shep

Reply to
Chevrolet

Chevrolet, I agree with Shep: have this puppy scanned. The 1994/95 3800 Series

1 engines are a bit weird in that they have OBD1 connectors but generate OBD2 codes AND don't have the "B" contact populated so the old "watch the blinking Check Engine Light" scan will NOT work. My 1994 Regal is this way too. These cars are sometimes referred to as "OBD 1.5" cars.

If I have to take an educated guess as to your problem, I'd rank in this order (AFTER checking the items Shep mentioned): Throttle Position Sensor, then Mass Airflow Sensor.

Regards, Bill Bowen Sacramento, CA

"Chevrolet" wrote:

Reply to
William H. Bowen

well.. had it scanned... O2 sensor. Seems to have made it better but number

4 cyl is not pulling like the rest adn it has a slight rough idle to it.. I changed the coil pack and plug/wire but thinking she has seen better days
Reply to
Chevrolet

Is that all you are worried about? That it idles slightly rough with no load? Personally, I wouldn't worry too much about that. Many of the vehicles that I drive in and out of my bay all day long do the exact same thing. Smooth right out as soon as you put a load on.

Ian

Reply to
shiden_kai

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