1988 Jeep Wagoneer 1988 wagoneer starting problems

Hello,

If I am not mistaken that year does not have a Crank or a Cam Sensor.

With what you describe it sounds like the Ignition Control Module which is located on the passenger side wheel well.

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[quote:ac26eff57a]
Thanks for your quick reply. There is a crank sensor on the vehicle. I have replaced the ignition control module but have not stopped the problem.

Do you have any other suggestions?
[/quote:ac26eff57a]

Please Post responses here in forum and not by email.

Thanks

Ok, Mitchell1 doesn't show a Crank Sensor on that year. Howerver, yes it can cause the problem, the knock sensor can also cause the problem.

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Ok, Also when the vehicle wouldn't start did you check to see if you had spark going into the Cap and at the Plugs?

Also did you check for fuel if you have good spark?

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[quote:59adc298d4]Most of the time the starting issues happen while I’m away from home so it’s difficult to say. Tonight it stopped while idling then wouldn’t start right away. About the 4th attempt to start the everything was fine but a few minutes later the idle was rough, then would clear up and run okay.

I checked the fuel pressure when I got home. The fuel pressure is 27 – 28 psig, 36 psig steady when the vacuum line is disconnected from the pressure regulator. Is the fuel pressure too low?

Thanks for your help.
[/quote:59adc298d4]

Ok, according to specs the fuel pressure should be 31 psi and with vacuum line removed from regulator pressure should be 39 psi.

So, I would say you have a weak fuel pump.

Here is another test you can perform for comformation...

1.Remove cap from pressure test port in fuel rail. Connect Fuel Pressure Gauge (J-37730-1) to pressure fitting. Start vehicle. Pressure should be approximately 31 psi (2.7 kg/cm 2 ) with vacuum hose connected to pressure regulator.

2.Pressure should be 39 psi (2.74 kg/cm 2 ) with vacuum hose removed from regulator. If fuel pressure is not to specifications, check for kinks or restricting bends in fuel supply and return lines. Check fuel pump flow rate. Pump should deliver minimum of 1.06 quarts (one liter) of fuel per minute with fuel return line pinched off.

3.If flow is inadequate, check system for plugged fuel filter or filter sock. Fuel pump flow rate can be checked by connecting a hose to fuel test port on fuel rail and inserting other end in clean container.

4.To operate fuel pump, install a jumper wire into diagnostic connector terminals D1-5 and D1-6. Pinch off fuel return line to ensure that no fuel returns to fuel tank. If fuel pressure is still not to specifications and fuel flow is normal, replace regulator.

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[quote:d3cfca1f7b]I tested the fuel pump and got the following information:

Fuel pressure running is 27 – 28 psi.
Fuel pressure with vacuum line off regulator is 36 psig.
Fuel pressure while momentarily pinching return – 75 psig.
Volume is slightly more than 1 liter/minute.

Shortly after completing these tests the vehicle quit while idling and would not start. Checked for spark at spark plug using an in-line spark checking device and had none. Checked for spark at coil wire and initially had none for a couple of cranks, then had spark and engine started.

I replaced the coil and spark plug wires and started engine. I let the engine idle for about 5 minutes then the engine quit. The engine would start, rev up like it usually does after starting then quits. I connected my fuel pressure gauge and notice there was no fuel pressure. When you crank the engine the gauge goes to 30 psig but quickly bleeds down after starting which is why the engine quits.

If I hold in the 3rd relay from the front of the engine the fuel pressure holds and the engine will continue to run.

Thanks and please help direct my efforts.[/quote:d3cfca1f7b]

Ok, Check for loose or bad wires in relay harness.

If all appear tight and in good condition check numbers on relay then check other relays for matching numbers and swap them out. Then start vehicle and see what happens.

Also Please reply to this post and not by email.

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I could hear the EGR solenoid click when forcing the fuel pump relay to close so I tapped the EGR solenoid, fuel pump picked up and everything is working fine.

I replaced the crank sensor and the vehicle is running great! Much better than it has in several months.

Great!!! Good Job....

If need anything else just ask...

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