Originally Posted by blue_bonn_evil
Im having a misfire backfire prob with my bonneville. Its been doing this since I bought it and I havent been able to figure out what it is. I think it may be my fuel lines but im not sure i was also thinking about having the crank sensor replaced but if that was bad I dont think it would run. Its not the ignition modle or coil packs, I already replaced those. I found a NOS kit, Performance computer upgrade (programmable by laptop) and a new ignition system that will do nicely but I dont want to put any of that on till I find out what the problem is. The computer isnt throwing out and service codes either so I was hoping to get some suggestions. PLEASE HELP ME!!! I love this car to death and I want to deck it out but I wont do it till I figure out why its running like this. [b]As soon as you stomp on the gas it sputters and backfires. If its cold it runs a little smoother and if you take off like a sunday driver it does ok to. Any suggestions?
Well all you guys are missing the problem here! Remember MY 92 SE! Remember Im running on 5.5 cylinders & why! Remember the 92 3800 NA is EGRless!
Okay, here'* what you do to confirm my suspicions: Do a dry compression check on ALL the Cylinders. What I think you will find is that one cylinder will be considerably lower than the rest.
What this means is that you've got the EXACT SAME problem as me & all other EGRless 3800 owners do: A BURNT VALVE! It took me two months to figure out my miss BTW!