Jim Grant's Tech Tips
'95 Chevy S-10, Won't Run
Q: My daughter has a 95 Chevy S-10 with a 4.3 Vin(Z) TBI engine. It quit running the other day. I checked the timing, (perfect), fuel pressure was good with about 13lbs pressure. I checked the spark at the plugs, ouch got plenty. I installed a new control module, dist cap, rotor and plug wires. It still wont start. I then pulled the timing cover off and checked, it was perfect. It will pop and crack a little through the pipes and carburetor like it is out of time but it isnt. This motor doesnt have a cam position sensor or crank sensor. What the heck, is my problem?
- Tony S.
A: You stated that there was plenty of fuel pressure and volume, but is there any fuel getting to the engine? What I mean by that, are the fuel injectors spraying fuel when you crank the engine over? Even though the fuel injectors are computer controlled, they do have their own power supply. If the fuse has failed youll have great fuel pressure and volume to the injectors; they just dont deliver fuel to the engine. Another item you may want to check is the exhaust. Why the exhaust? If there is fuel, spark at the right time and the valve timing is correct then can the engine breathe? A failed catalytic converter can plug an exhaust right up. When this happens the engine cannot breathe. For the engine to pull in air it must be able to expel it as well. A quick check for this is with a vacuum gauge to check cranking vacuum or unbolt the exhaust pipe from the manifold. Youve more than covered the basis, youre just missing a piece to the puzzle to get your daughters S-10 running again.