I have been trying to fix my car with my father’s help for the past month or so. Usually I go to a mechanic but the problems were with the engine and all local mechanics were charging way too much.
A little history:
My car lost its timing belt. I got the cat used so I did not know the belt was due. Upon opening the rocker cover, it was clear that all the valves were up when it blew (or at least we think it was clear. No damage was visible but we’re by no means mechanics) so we decided to try replacing the belts and seeing what happened. Now my father did moat of the disassembling and I helped putting the belts on. The car fires up! So excited! I tried driving a little (just running some small errands) and realised all was not well. I noticed jerking from shifting gears and vibrating at high rpm. “crap maybe a valve is bent”. So I did some research and found it could be that I need an oil change, need to put a proper gasket on the rocker head, or need a new motor Mount. Okay fine did all those (one Mount was broke) and it fixed the jerk! Go for a test drive and it drives normal until you get ~1000rpm from redline. At this Point the gas pedal vibrates violently.
Car drives fine until ~1000 rpm from redline. At this point the gas pedal vibrates violently, but the car will still increase rpm. There is no shaking at lower rpm. Speed does not effect the shaking, only rpm. Happens in first and second gear, I cannot test third and fourth as I don’t drive that fast on public roads. Idle seems fine. Doesn’t happen out of gear.
What I’ve come up with:
By researching and talking to friends I’ve found This couldn’t be a wheel alignment, or it would happen at all speeds and get worse as I go faster. There was a guy who had a Ford gt with similar symptoms and it was in need of a transmission alignment. I have no idea if this is a thing but I hope isn’t the problem. I don’t see how the transmission could have been misaligned Anyway. One of the timing gears is off by one tooth. This could be the problem but I don’t know if it would cause shaking at high rpm and we double and triple checked it. I wouldn’t love pulling it apart again to check again but I may have to. A valve could still be bent I suppose but again I don’t know if it would do this. The forum about the Ford gt also mentioned the engine could be getting starved of gas, but I don’t see why it would be now when it was fine before. Unless of course the timing is off by a tooth and it’s spitting gas at slightly the wrong time.
I’m pretty deep in this project now and really just want to drive my car. My father is fed up and wants me to just drive it but I don’t feel safe. I appreciate any help/input/ideas anyone could provide. Thank you.