Buick Stalls – Changed IAC and MAF Sensors

1998 3800 stalls when you let up on the accelerator. I changed the IAC valve, still does it.Do I need to drive it for a while for the computer to reset.If not, maybe the MAF???

ProTech: Is the check engine light on?

Check engine light has come on a few times in the past week , but then goes back off. It has NOT come on since this started. When the light did come on it wasn’t stalling.

It might be a good idea to get it scanned. The code would still be in there even if the light isn’t on at this time. MAF sensors have been known to go out on the 3800 engines and cause very strange driveability problems. It could be that, but it would be best to know if there’s a code first.

OK, I can take it to a friends shop and he can scan it. Just trying to fix it before monday, but I can wait. Guess I probably should?Thanks!

Yeah, it is better than guessing at parts. You’re welcome!


Buick Park Avenue Stalls

When the car is just started it runs great. After it reaches 196 degrees the tachometer jumps up and down along with the voltage then the car stalls. Also stalls when decelerating and i have to feather the gas pedal. I have replaced the fuel filter and i have also tried using an obd2 on the data port it doesn’t work and the fuses are ok.

You need to get the fuel pressure checked. You may have a pump going bad. But, with the scanner not working, what makes me think the PCM is bad, although you need to be sure the scanner works with another car because it could be a wiring problem with yours.

Also have the MAF sensor checked. This ill also cause the engine to stall.


Buick Lesabre Dies

Hi there, the other day i drove my Buick to town without any warning signs. I did my shopping, got into car started it and then it just dies? It didnt want to start anymore after that. Now the engine is just turning over but nothing more. What could have caused this sudden problem?

Answer: Many things can cause your Buick to die and not start. You would need to check for spark and fuel pressure. A common cause for this problem on the 3800 V6 is a bad crank position sensor. It is behind the lower crank pulley.


2007 Buick Engine RPM

What rpm’s should my 2007 Buick be running at when driving? Not sure if it is accurate.

ProTech:
Like at what speed is the car going? Is this around town or highway driving?

Highway driving.

Well at 55mph – 65mph your engine should be running around 1800-2000 RPM’s if it is in overdrive. If the engine is running too high you could have a transmission problem.

Thanks.


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