HT4100 4.1, 4.5, 4.9 Discussion, 1983 Eldorado engine running problem! in Cadillac Engine Technical Discussion; Hi guys!
I've recently bought an 1983 Eldorado ht4100. It ran great for a while. Then i decided to repair ...
I've recently bought an 1983 Eldorado ht4100. It ran great for a while. Then i decided to repair the leaking gasket on valve cover ( passenger side). Along with gasket repair I have removed spark plugs and replaced them with new ones ( all 8). When I have put everything together again car started to make problems. When I try to start it sometimes it hesitates to start. When it's running in Park position it runs quite OK, although engine shakes a bit from time to time, but when I put it in gear the RPM drops dramatically, shakes like crazy and when I add throttle it sometimes shuts down. When I try to drive it the car lacks of power it feels like its running on 7 cylinders (my guess). I have checked sparks, work fine, cables, work fine (i have even additional isolated them), the on board diagnostic computer shows no errors. Please help!
My bad is that I am from Europe and these cars are very rare here and i don't have a lot of spare parts nearby or mechanics that ever saw such a beautiful peace of engineering. So guys, you are my only hope.
I didn't replace them, but I have additional isolated them with isolating tape. The firing order is OK (double checked). Today I will get an electrician to check the wires and I'll post what happened. Thanks for reply!