Fireing Problems(89 Jeep Cherokee)

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Nov 26, 2011 | 04:01 PM

Robert_7200

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Joined: Jan 2011

Posts: 82

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From: Twenty Nine Palms, Cali

Year: 1987

Model: Cherokee

Engine: AMC 242 I6 (4.0 L)

Fireing Problems(89 Jeep Cherokee)

I am having fireing problems. i am getting fuel to the rails and spark to the Plugs.. it wants to start But just wont.. Any ideas?

Nov 26, 2011 | 04:12 PM

Robert_7200

Thread Starter

Junior Member

Joined: Jan 2011

Posts: 82

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From: Twenty Nine Palms, Cali

Year: 1987

Model: Cherokee

Engine: AMC 242 I6 (4.0 L)

I checked the injectors with the Noid things and EVERY one of them work. i changed the Dis cap and Rotor.

HOw rare is it to Jump Timing?

Nov 26, 2011 | 05:34 PM

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Robert_7200

I checked the injectors with the Noid things and EVERY one of them work. i changed the Dis cap and Rotor.

HOw rare is it to Jump Timing?

Like just about never heard of.

What color is the spark? Blue or yellow?

Try this:

Renix Jeep ICU/Coil contact refreshing
　
　
The contacts between the coil and the ICU on your Renix Jeep can become corroded and loose causing a complete or intermittent no-start condition. I recommend the following procedure as a maintenance precaution to insure this is eliminated as a possible cause now and in the future.
The coil is attached to the ICU by two T20 Torx bolts. Remove these two bolts and lift the coil up off the ICU. You will see 2 pins and 2 sets of contacts. Clean both the pins and springy contact pieces with a good electronics cleaner.
Squeeze the springy contacts closer together with some needlenose pliers. Apply some dielectric grease to the contacts and bolt the coil back on to the ICU.
While you’re right there unplug the connectors from the ICU and inspect the pins in the harness connector. Make sure the pins are not retracted into the connector. Spray out the connector and the receptacle of the ICU with the same good electronics cleaner you used earlier. Apply dielectric grease to the connectors and plug them back in.
I feel this procedure should be performed at least once in the lifetime of a Renix Jeep.
　