1998 Chevrolet S-10

Engine Performance problem
1998 Chevy S-10 4 cyl Two Wheel Drive Manual

I just rebuilt a 2.2l in my employees car. Engine timing marks were on the nose and dialed in for #1 top dead. When we fired up the engine it acts like the timing is advanced a tooth as the motor shudders/shakes heavily while it runs. I know that the timing gears and chain were dead on at assembly. I also now that if the timing was retarded a tooth we would get popping and sputtering out the pipe. We have none of that. There is no mechanical noise when she run but the shudder is very pronounced. There is no distributor on this, instead there is a cam position sensor. Also the check engine light flashes red. I can not find anywhere to adjust the timing on this engine. I am a seasoned mech and it feels like the timing is roughly 15-20 degrees advanced. Its like the engines fires on the upstroke and the combustions tries to stop the upstroke of the pistons. Not enough to stop it from running tho. Can anyone tell me how to adjust the timing on this vehicle. I also got the plug wires running 1, 3, 4, 2 with #1 being closest to radiator. Thanks for any advice you can give.
June 11, 2008.

Well we are buying one thats used from a used parts retailer that gives us a 2 year warrenty on any part sold by them for an additional fee. The standard warrenty is 90 days on anything sold. Even electrical parts such as this. And its coming out of a same year same model truck and has the same part number and vin code designation markings. So we should be fairly safe. The guy at our local dealership said if there was any issues with compatability or reprogramming was needed he would do it for 50$. We are getting the module for 25$. Considering a new one, out of the box, is 550$ this is our cheapest easiest way out on a tight budget.

Jun 19, 2008.
Sounds like a very good deal you got there! Just go with the warrenty!

Jun 20, 2008.