I have a 1993 Chevy G30 Van with a 6.2 liter diesel engine, it just crossed over its 100,000 mile mark. We have been travelling in this van quite a lot driving long distances often. We started experiencing a problem on a cold morning not to long ago, I had the similar problem in the summer and after adding additive it halted until recently (an additive didn't work this time).
The problem is: I start up my engine to warm it up I let it idle for 5-10 minutes, Its starts in a slightly high idle and when its ready it drops to a lower idle. Lately its starts up fine and runs at a high idle then it will jump to a very very high idle (don't have an RPM gauge) sometimes it will fluctuate up and down everyonce in a while stalling and shutting off, but usually dropping to a normal idle and I leave. As we drive and it gets warm the problem becomes less and we forget about it until the next morning. Also when I drive it will surge in speed somtimes when barely pressing the gas and others will barely give me any power at all. I do have a coolent leak and fill that up every once in a while, I don't know if that is related.
I have read other threads similar, you've listed IAC, MAF, idle speed motor, could those apply to a diesel, Air? I have taken it to a mechanic and since it was warm they couldn't figure anything out.
Thank you for the help sorry for the length of the post.
The problem is: I start up my engine to warm it up I let it idle for 5-10 minutes, Its starts in a slightly high idle and when its ready it drops to a lower idle. Lately its starts up fine and runs at a high idle then it will jump to a very very high idle (don't have an RPM gauge) sometimes it will fluctuate up and down everyonce in a while stalling and shutting off, but usually dropping to a normal idle and I leave. As we drive and it gets warm the problem becomes less and we forget about it until the next morning. Also when I drive it will surge in speed somtimes when barely pressing the gas and others will barely give me any power at all. I do have a coolent leak and fill that up every once in a while, I don't know if that is related.
I have read other threads similar, you've listed IAC, MAF, idle speed motor, could those apply to a diesel, Air? I have taken it to a mechanic and since it was warm they couldn't figure anything out.
Thank you for the help sorry for the length of the post.
Oct 19, 2007 at 10:54 PM