09-26-2009, 01:34 AM
Join Date: Jun 2006
Location: Springfield, NJ
Total Cats: 0
Rough running and bucking :(
Big problem with my car.
A week ago it suddenly began to drive very rough and lost some power. It also sounded very drone-y. These were the exact same symptoms I had a year ago (two separate times) when I had fuel injectors die. So, I figured I have yet another bad injector. Paul sold me one of his extras (I use 460cc). I never installed an injector before, but I observed the procedure several times (Paul), so I had a decent idea of what to do.
But first, I thought maybe the problem was my coil wiring, because of my previous unsuccessful COPS attempt (a few months ago I ran out of time and went back to stock coils and wiring.) So rather than diving into the injector installation, and rather than trying to diagnosis possibly fault stock coil wiring, I figured it made more sense to go back and finish the COPS. Did that, COPS now works fine, but the current problem remained. Guess it wasn't the coil wiring; at least I got the COPS done though.
So .... next I changed one injector. I listened to all four with a long screwdriver, and decided #1 sounded quieter than other three. Reassembled everything. The car started, but immediately jumped to 2500 rpm. Called up Paul; he said I must have a vacuum leak. I disassembled everything, reseated all four injectors, rebuilt it again, and this time the idle was back to normal. (Miraculously, despite this being my first hands-on injector change, I didn't lose any spacers!)
However the current problem STILL remains. Maybe it wasn't #1, but a different injector .... maybe it's some other problem entirely ....
At that point I had to go home (was at my parent's house to use their garage all day.) Went for the 20-minute trip up the highway and found a NEW problem that I never experienced before: the car now has severe bucking from approx. 2,700 rpm and up. Great ......
Bottom line is, I fixed nothing this weekend despite two days of working on my car, and now there's a much worse problem.
This is very, very bad, as I nee my car running because I don't have another one, have to drive my mom to chemo next week, etc.
What could it be, at least re: the bucking ????
Many MSM owners had problems with their stock fuel pumps, but the car seems to start strong, so I don't think the fuel pump is bad.