Engine pick-up problem
Thread Starter
AutoX
Joined: Aug 2002
Posts: 11
Likes: 0
From: Decatur, AL
Engine pick-up problem
I have a 1985 928S with a 32 valve engine, I just finished putting new heads on this engine. The engine idles fine, but when you try to rev the engine up, the engine starts to stall. It's possible to slowly bring the rpms up alittle at a time. I had this problem before I took the engine apart. I have seen some black smoke come out of the tall pipe when it's running, maybe it's getting too much fuel. Any ideas what I should check? Thanks Mike
Addict
Rennlist Member
Rennlist Member
Joined: Jun 2001
Posts: 7,029
Likes: 49
Does your car have the flappy?
I'd begin with Greg Nichols' site for trouble shooting.
<a href="http://ourworld.compuserve.com/homepages/nichols/tips.htm" target="_blank">http://ourworld.compuserve.com/homepages/nichols/tips.htm</a>
Good luck.
Scott
I'd begin with Greg Nichols' site for trouble shooting.
<a href="http://ourworld.compuserve.com/homepages/nichols/tips.htm" target="_blank">http://ourworld.compuserve.com/homepages/nichols/tips.htm</a>
Good luck.
Scott
Thread Starter
AutoX
Joined: Aug 2002
Posts: 11
Likes: 0
From: Decatur, AL
The engine is most deffently leaning out. I checked the fuel pressure with a gauge and it's just fine. The vaccum seems to be good as well, couldn't find any leaks, I checked it with a gauge as well. My next guess is a sensor. Any ideas?
Addict
Rennlist Member
Rennlist Member
Joined: Jun 2001
Posts: 7,029
Likes: 49
After checking grounds and all electrical connections, I'd check your O2 sensor.
I don't know how long you have had the car, but some people replace them every 30k miles.
Once the O2 sensor is replaced, then check your mixture. This is easy to do with a digital volt meter.
With car warm, at idle, measure voltage output from O2 sensor. It should be about 0.7 volts. If it is lower, then make adjustments to your mixture to bring into spec.
A wrench told me that our cars are known for running rich... rarely lean. I had the same problem of lean running and found out the MAF was bad.
HTH,
Scott
I don't know how long you have had the car, but some people replace them every 30k miles.
Once the O2 sensor is replaced, then check your mixture. This is easy to do with a digital volt meter.
With car warm, at idle, measure voltage output from O2 sensor. It should be about 0.7 volts. If it is lower, then make adjustments to your mixture to bring into spec.
A wrench told me that our cars are known for running rich... rarely lean. I had the same problem of lean running and found out the MAF was bad.
HTH,
Scott
Thread Starter
AutoX
Joined: Aug 2002
Posts: 11
Likes: 0
From: Decatur, AL
Scott,
My first guess was the O2 sensor was bad. I did check the O2 sensor, with the car running it's at .5 volts. The ohm reading was right at 6.1 ohms. I might be wrong but everything I've read it's within spec. I did put some new fuel in the car and that seemed to help some. There is a fuel smell when the car runs a while, maybe I was wrong and it's running rich. Still studing and measuring.
Mike
My first guess was the O2 sensor was bad. I did check the O2 sensor, with the car running it's at .5 volts. The ohm reading was right at 6.1 ohms. I might be wrong but everything I've read it's within spec. I did put some new fuel in the car and that seemed to help some. There is a fuel smell when the car runs a while, maybe I was wrong and it's running rich. Still studing and measuring.
Mike