Why does your service engine soon light comes on when going downhill 1993 grand prix?
There may be something worng with the main prossesor
1997 Z71 V8 When going up long grades and accelerating the engine feels like its sputtering and the service engine soon light comes on.?
There is an area west of Denver on I 70 where it looks like you are going downhill but the laboring of your cars engine and even my GPS indicates I am going uphill. Anyone else know about this?
In Scotland we call that an "electric brae". There are one or two famous examples, which have become (in a small way) tourist attractions. It is a kind of optical illusion, where the lie of the land tricks your brain into thinking you are going downhill, when the physical reality is the opposite. There you go!
454 engine in 91 Chevy motorhome starts and runs good until warms up then the injectors dump too much fuel and stalls engine?
I have a 1991 Chevy 30 foot motorhome chassis p-30 with a 454 engine tbi. Going up an extended grade, engine loses power, service engine lite comes on and stumbles and surges. Changed fuel filters twice, and problem seem to stop, but only to come back after approx 250 miles. Seems to happen only on a long up grade. On crest of hill and downhill, as load is decreased, lite goes off and truck seems…