1985 Porsche 944 vibration in engine

need to know what year make and model and what engine it has in it first thought comes to mind is that you are getting to much gas into the cylinders going past the rings

while the belt is off, engine off, check for a frozen pulley-except for the crankshaft, one is probably locked up or makies a lot of noise/wobbles when turned by hand.. Also, look at the pulleys and see if they 'line up' by looking at them from the side.

sounds like it could be "knocking from the cam". i would throw a thing of SeaFoam or Marvel Mystery Oil in the oil slot. my knocking went away in 100 miles. the stuff works wonders. Good luck. My knocking used to be very loud the higher the rpms.

definitely use a high mileage, synthetic oil for foreign made cars appropriate for a 4 cylinder engine.

we will usually check fuses and relays first. then put power directly to the fans and see if they power on. this will narrow down your problem

blown head gasket or intake manifold gasket will cause your problem

Sounds like a warped head.

YES THIS IS THE FRONT MAIN BEARING SEAL, IF YOU HAVEN'T DONE THIS BEFORE I SUGGUST YOU TAKE IT TO A DEAL.. THEY CAN BE TRICKY..PROBLAY A COSTLY FIX.. GOOD LUCK KEITH..

I would Check/Replace the Transmission Mounts. That would be the Only Reason that the Shifter would Vibrate this Bad. Please Rate My Response! Thanks!

You will not be able to hear the fuel pump on that model. First you have to determine if you get fuel and have spark. If it is a fuel problem, replace the DME relay first. Very common. They act up and fail without warning. Part is cheap and located in the fuse box. Next would be the fuel pump.
If it is spark related it may be the Flywheel Reference Sensors. There are two and the cost about $100 each.

Good Luck.