GMC Repair: 93 GMC JIMMY 4.3L CPI 4X4, ford crown vic, gmc jimmy


Question
Hello Sir,
The problem I have is the engine stalls after it has been running for a while (heat related I belive now),at first I thought it was the fuel pump, because it acts like it is running out of fuel when it dies. I changed the fuel pump and filter first but had the same results. Then I suspected the pickup coil, so I changed it along with new plugs, wires, cap, and rotor. That wasn't it either. Lastly was the coil... Still didn't fix the problem. It does not have any codes set that I can retrive by shorting the terminals, no lights or any indication of a problem. When it dies, it will start right up after about 20 minutes of cool time.
It has 183.5k miles on it now. The only problems I have had with it was a broke crank at 90k and a fuel pump at 93k.
Could it be the ECM? Is there a way to check it without having to buy one?
Any help is greatly appreciated.
Thank You,
Reese


Answer
There are so many possible items that can cause this that it would take hours to list them all.

The first thing you need to determine when it first stalls out and it won't immediately re-start is to determine if you have an IGNITION problem or a FUEL problem.

I noticed you did not change the ignition module. If you do so, Remember to coat the bottom of the module with the enclosed packet of heat disapent solution.

Start disconnecting any and all connectors located within the engine compartment that are always necessary to disconnect when removing the engine. In 99% of the cases these disconnected electrical connections are always left uncovered and the longer they remain uncovered they tend to start to corrode the electrical contacts within the connectors due to the dampness and water absorbtion.

In most cases this corrosion of the contacts gets progressively worse very slowly over time usually months later your type of problem starts to occur.

I have seen this many many times. In fact I bought back in 1998 a 1991 Ford Crown Vic that was in excellent condition and all it cost me what the outstanding repair bill of $1500. The vehicle was a one owner with 57,000 original miles on it.

It had the engine removed several months prior due to a leaking oil pan gasket. I suspected that the cause was most likely moisture absorbtion within one of the electrical connections and it acted exactly like your problem. I drove it home and started looking and I found the corroded terminals in one of the engine wiring harness connectors. I cleaned it and am still driving the vehicle to this day.

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