Tom

Tom,

Q I have a ’79 Dodge van with 98,000 miles. When I start the engine it runs

a little rough, but when I put it in gear and try to move, it splutters, pops, and
stalls. I wondered whether I was just out of gas because I don’t use the
vehicle very often, and I suspected the gas gauge was lying. So I put a couple
of gallons in, but it didn’t seem to make any difference. Someone suggested
the timing chain sprocket (which I understand is nylon) is worn and needs
replacing. If it is the sprocket, can I replace it without having to reset the
timing? Any suggestions would be much appreciated. Thanks for your help.

Geoff—Fresno,   California

Geoff,

A If you need to replace the timing chain sprocket you will have to reset the

ignition timing. I suggest you check the number one cylinder in reference to
TDC (top dead center). This will verify if the cam sprocket (nylon gear) has
jumped a tooth in timing. If this sounds over your head, then take it to a shop
and have it diagnosed. This should cost you roughly one to one and a half
hours of diagnostic time at the shop’s labor rate. Good luck.