You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to start new topics, reply to conversations, privately message other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Chevrolet forum today!
my celebrity runs very rough when it has reached operating temp, then turned off for a short period of time, it starts up idleing rough and eratic until engine is raced then it seems to clear up. it starts up with NO problem when its cold ( not ran overnight) A mechanic ruled out the computer is not putting out a rpm signal, he replaced with new one and no change he also replaced crankshaft sensor, I have replaced coolanttemp, oxygen, map , tps sensors and no improvement, all this is costing me more than what the car is worth but I cannot afford to buy another car at this point, any ideas would be a big help, Thanks ....John
Register today for free or log-in if already registered to remove this ad!
well funny thing happened that convined me it is the ignition module , I disconnected the 3 harness connections one night, then next day I cleaned the contacts ( they weren't really dirty ) and reconnected them and car ran better for a day or 2, I don't understand why but I read that same thing happened to someone else wrote in a simular formum,Does this make any sense? the 3 connections were all tight and not corroded at all.
well now i'm thinking my Eprom may be bad so I ordered a stock one for my specific ecm, so I have question , what should I try first or should I say if my ICM is bad will it kill the new EPROM and vise versa? so Should I install both the new parts at same time, or is there a risk of one damaging another? (possiblby bad ICM with new EPROM or new ICM with possibly bad EPROM) another reason I got a new Eprom is because I'm not sure if former owner did a speed densidy conversion and didn't put any id or stickers saying it was done, I assume it was converted because The maf relay had been removed and when My mechanic scanned my ecm , he got eratic readings which is descriibed in a article I read on a speed densidy conversion. so with stock EPROM the system would use the maf and its relay, and also a stock IAC which I have bought already. This car has me confused but I think I'm on the right track, I hope
88 celebrity warm engine issue
