4.0 almost dies but instantly corrects

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11-12-2020, 02:42 AM

#16

Philippe L.

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Location: Lint, Antwerp, Belgium

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Year: 1992

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Canadiantech

I had similar issue with mine, but mine got worse over a year, i did a bunch of part swapping, nothing seemed to help. I tore into the wiring and found the main wire from the ASD relay just hanging in by a thread, repaired the harness and have had zero issues since.

What issues are you talking about?

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11-12-2020, 02:44 AM

#17

Philippe L.

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Year: 1992

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by doublechaz

As a test, you could pull the cat out and dump the chunks out and put it back. But long term you should replace it since the chunks you dump out are the part that makes it do it's job.

I'll be checking it out this weekend. I read that you can measure in- and outlet temperatures of the cat to confirm if it still works. Could be a nice thing tot try.

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11-12-2020, 04:32 AM

#18

doublechaz

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Year: 1988

Model: Cherokee (XJ)

Engine: 4.0

True, but temperature in and out works better when the cat is not plugged up. After you dump the chunks, if there looks to be stable matrix left in there, you can check if there is still more heat at the back indicating it is still doing some work. I think there is a decent chance of this.

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11-12-2020, 02:51 PM

#19

Idunno

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Model: Cherokee (XJ)

Quote:

Originally Posted by doublechaz

As a test, you could pull the cat out and dump the chunks out and put it back. But long term you should replace it since the chunks you dump out are the part that makes it do it's job.

Can be a major-major trying to separate the cat without sacrificing the in/out tubes. That's why I R&R'd the cat/muffler as assemblies. The total for them both was under $150.00, though a new aft O2 sensor may be needed.