no spark, need help bad

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chubbyhick

NAXJA Forum User

Location

Pennsylvania

• May 30, 2005

• #1

I have an 89 MJ, 4.0 5spd. My truck will not start. i have replaced the following: CPS,TPS,coil,o2sensor,dist cap,rotor,plugs,wires,and cleaned and checked the egr valve. I have fuel, and i have bypassed the ballast resistor. I have power going into the coil, but no spark. I have done a search and nothing helped, any help would be appreciated.

 

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chubbyhick

NAXJA Forum User

Location

Pennsylvania

• May 31, 2005

• #2

just to update it did for a couple seconds fire, backfired, blew the muffler apart, ran really rough and then shut off. i have completely changed the distributer, and redid the CPS harness. still to no avail. please somebody help. I have no idea where to turn next.

 

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badge714

NAXJA Forum User

Location

Youngstown, Ohio

• May 31, 2005

• #3

Did it backfire for you before you changed distributor. Did you check for spark both at coil wire and at plug wires. badge714 [email protected] Does your jeep have the ignition module mounted under coil

 

Last edited: May 31, 2005

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chubbyhick

NAXJA Forum User

Location

Pennsylvania

• May 31, 2005

• #4

it backfired before i changed the dist, and yes their is a ICM under ther coil. I was just wandering if anyone thought the computer under the dash went bad, or maybe the ICM.

 

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Runnin'OnEmpty

NAXJA Forum User

Location

Southeast USA

• May 31, 2005

• #5

My guess is that the ICM is bad. If you have power going to the + side of the coil, and no spark, it's probably the ICM......

 

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chubbyhick

NAXJA Forum User

Location

Pennsylvania

• May 31, 2005

• #6

would the computer from an 89 cherokee with an automatic be the same as an 89 commanche with a 5spd? i have access to on cheap.