Module Question 1991 Chevrolet?

Question

I would like to know the exact function of a module in my car called a E.S.C. Electronic spark control. I know it isn't the ignition module in the distributer or the computer that controls the engine.I have a 1991 Caprice with a 5.0 and I have had bad ignition cutout when the car is warmed up. the entire ignition cuts in and out when the car is under any kind of load. I have replaced the cap, rotor, ignition module 4 times. Also I replaced the P.C.M. spark plug wires and plugs. and yet the problem persists. It is a open loop problem as the car doesnt miss a beat when its cold, it starts up great even in -0 temps but as soon as it reaches normal opp. temp the problem starts agan. it seems to happen when the engine needs to adjust timeing during acelaration. all other sensors check out good and there are no shorts or grounding problems.

I thought that the knock sensor on the block did that timeing retarding not the E.S.C.

I thought that the knock sensor on the block did that timeing retarding not the E.S.C.

I have only 5000 dollars left to buy parts with to fix this car

Answer 1

Right out of manual:
The Electronic Spark Control (ESC) system module sends a voltage signal (8 to 10 volts) to the ECM when no spark knocking is detected by the ESC knock sensor, and the ECM provides normal spark advance. When the knock sensor detects spark knock, the module turns "OFF" the circuit to the ECM (0 volts). The ECM then retards EST to reduce spark knock.

If you don't have testing equipement, replace the knock sensors and see if that doesn't solve the problem.

Answer 2

The electronic spark control ESC, is designed to RETARD the timing when the engine senses a spark nock or pinging. If you use a cheap grade of fuel and you are getting pinging, the ignition control will RETARD the timing to stop the pinging, this will also reduce your power. Any noise in the engine such as a lifter knock will make the ecm beleive there is a spark knock and RETARD timing.

Answer 3

This is a little " Rube Goldberg" but try after engine warms and the sucker is idling, and take a long extension or whatever you can find that's metal....place it on the engine block and hit it ( lightly) with a hammer....see what happens. If it acts up ? Knock sensor or related circuit. I have also seen knock sensors damaged or disconnected....car still runs....try that and see 2. Hope I helped.

Answer 4

get out your wallet/creditcard/checkbook and pay a professional.cut your losses and quit guessing its already cost you enough money