Question about 1990 Jeep Comanche
I first thought this was a fuel system problem, but after changing out the pump, fuel filter and the pressure regulator, I still had the same issue. I stumbled on to this only because I held the key switch in the start position a little to long. The truck will run if The switch is held into the start position, but as soon as you let the key switch return to the run position it stops. I have since changed the Ignition Switch (tilt wheel), key lock cylinder and the Ignition control module. After doing each one I had the same result. I also had a spare control unit and swapped them out and had the same result.
One of the relays (black plug in boxes) beside the starter coil are defective or loose
Posted on Feb 02, 2009
This could be several things. Before you changed the fuel pump, you
should have checked to see if the problem is electrical, or mechanical
One of the first things you needed to do, was to check the fuel rail to see if you had the proper fuel pressure. This would have saved you a bunch if you had the proper pressure at the rail. You can purchase an inexpensive fuel pressure testor at Harbor Freight Tools.
The next thing you need to do is to find out if you have power at the spark plugs. If not, then you need to check out the distributor cap, rotor, plugs and plug wires. If these all are ok, then you need to check the ignition coil.
From there, if all seems ok, then you could have any one of several sensors bad, or a bad computer.
If you changed out the fuel pump yourself, then you must have some mehanical ability,
Posted on Nov 04, 2008
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Posted on Jan 02, 2017
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