Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
basicaly think of it as a tapering sin wave.
Turn the key, pressure comes down engine starts and does the initial high idle pressure stays pretty constant. idle comes down to normal and engine runs briefly just like it should then rpms drop into the 200s or less and fuel pressure drops down into the high 40s during maybe before the drop. Engine revs on its own to above idle speeds and then comes back down fuel pressure goes back up at the same time to roughly 60psi then it goes through the same cycle each time the recovery time gets worse until the motor dies out. This lasts maybe 30 seconds from start to die. It reminds me of a cold started weed eater when you open the choke too early...
Yes it goes into drive and it will drive but you can feel the misfires like random little losses of power but only starting at about 45mph and the occur frequently. It starts fine and has a little shake while idling accelerates without any missing that I can feel. It just seems to do it when the load levels out (cruising at 45) or at idle.
Ok will do on my lunch
Ok so I have the report I put about 300 miles on it p0300 code still on.
Cylinder 1 18K misfires
Cylinder 2 6500
Cylinder 3 23k
Cylinder 4 32k
Cylinder 5 28k
Cylinder 6 10k
Cylinder 7 20k
Cylinder 8 27k
I have more data from the program I use if you need it but for the life of me I am lost here. Pulled the distributor this weekend there is some wear on the distributor gear but not more than I would expect with 120k miles on it.
So when it misses the worst and I can watch the misfires climb is on the flat at anything above 65mph when holding a constant speed and when going down hill in cruise or just keeping a constant speed. It does not miss at all when idling (so says the computer) or when pulling a load or going up hill or during acceleration.
lets see if we can get another opinion from another expert i am missing something here.hang on lets see if another expert can take a look and give you his opinion.hang on another expert will reply back to you