Changed timing belt now car isnt running right

4n muscle · Dec 8, 2003

I replaced the timeing belt on my 95 gst. The car sat for a little while before i could get to the belt. When i changed the belt and tried to start the car only one cylinder had comppression. After tinkering with it i got the comppresion back in all but one cylinder. I can figure what the problen could be. I figured the ring might have gotten stuck, so i oured some oil in them and it made two of them free up. But the last one wont do anything.

the car idles rough up to about 2k rpm but once over that it feels normal. I drove it and it feels like its running on 3 cylinders until about 2k rpm, then it pulls just as hard as always. Im really confused. Please help.

thanks, josh

Sean485 · Dec 8, 2003

Ok, first did you replace the belt as preventative maitance or did you replace it because it broke?

If you replaced it and it wasn't broken then you most likely have the cam timing set incorrectly, if it was broken then you have bent valves...

4n muscle · Dec 8, 2003

sorry for leaving that part out. I replaced it because the water pump went out.

Sean485 · Dec 8, 2003

If thats the case then i'd check your cam timing again, if that is good then i'd try a leak down test to try and figure out why you have one cylinder with low compression.

You may have bent a valve when you were "tinkering" with it...

4n muscle · Dec 8, 2003

the tinkering i was talking about pretty much consisted of pouring a little synthetic oil in the cylinders. Timing is good all the way around.

vegabass15 · Dec 8, 2003

did you overheat when the waterpump went? maybe you warped your head or somthing

4n muscle · Dec 8, 2003

i never let it over heat...i fixed it when it started squeaking...

Sean485 · Dec 8, 2003

You said the pistons had zero compression after you changed the belt right?

Then you dumped in some oil and it jumped up?

If so that points to rings obviously but that doesn't make sense as I dont see how it could go from running to having no compression even if it did sit for a while.

How long did it sit?

V8s_are_slow · Dec 8, 2003

just throwing this out there.....but since it feels like it's running on 3 cylinders, have you checked your plugs or wires?

4n muscle · Dec 8, 2003

it sat for 3 months (its my second car). And i checked the plugs wires, and spark.

Changed timing belt now car isnt running right

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