1989 Cherokee cranks no start.

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08-30-2021, 07:35 PM

#16

JacobCanale

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Join Date: Oct 2019

Location: Langley BC

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Year: 1989

Model: Comanche (MJ)

Engine: 4.0 L

Quote:

Originally Posted by cruiser54

Good plan

Just got around to putting the used icm in, and we have spark! Sadly not starting still, but sounds very close to starting. Looked at every spark plug, and a few of em are sparking orange, so pretty weak. Side note, when starting, after a few cranks I hear a blowing noise? Like pressure from somewhere is being relieved. I’ll attach a sound clip in a little bit. Any ideas?

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08-31-2021, 05:38 AM

#17

Dave51

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Join Date: Jan 2017

Location: Connecticut

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Year: 2000

Model: Cherokee (XJ)

Engine: 4.0

Note from D51:

Check compression.

Quote:

Originally Posted by JacobCanale

The rotor is spinning when it cranks but not very fast.

Compared to what? What it's supposed to be? You could have a catastrophic failure.

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BlueRidgeMark (08-31-2021)

08-31-2021, 08:52 AM

#18

JacobCanale

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Year: 1989

Model: Comanche (MJ)

Engine: 4.0 L

Quote:

Originally Posted by Dave51

Note from D51:

Check compression.

Compared to what? What it's supposed to be? You could have a catastrophic failure.

At the time it seemed slow, but now that I have spark it is cranking to where it is almost starting. I believe the cause is weak spark. Gonna swap the injectors around to test

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09-05-2021, 07:15 AM

#19

PCO6

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Join Date: May 2010

Location: Newmarket, Ontario

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Year: 1989

Model: Cherokee (XJ)

Engine: 4.0 L

Quote:

Originally Posted by djgrayxj

Note from DJ

... If you are checking for spark this way you need something that has an insulating handle in your hand; if not your body may become the shortest distance for the electricity to travel. This is not a good feeling!
What I use a number two fillips screw driver.

I got shocked once about 40+ years ago and said "never again". I made this simple tool for testing plugs & wires.