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Unread 08-24-2011, 04:59 PM   #1
midnight_f150
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89 4cyl YJ no spark

I have a buddy who owns a 89 YJ with 4cyl motor he is getting fuel but no spark to any of the spark plugs. He is looking for some troubleshooting ideas?

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Unread 08-25-2011, 08:31 AM   #2
nembudonna
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Check the spark control module. It's on the passenger side firewall.
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Unread 08-25-2011, 09:04 AM   #3
Que89YJ
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Check the Ignition control module. The ICM. Make sure it has power. It's a high fail part. The fact it has fuel would mean the crank sensor is probably good, but the pickup sensor inthe distributor could be a possibility. I have an 89 and with no diagnostics like the OBDI systems its a little more difficult to nail down. Do you have a meter to do some readings?
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Unread 08-25-2011, 10:47 AM   #4
Quags
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FWIW: Have the auto parts store check the module before spending cash on a new one. From many threads and personal experience, the Crank Position Sensor has been the culprit many many times. I had absolutely zero spark after a transmission change in June. Went through the entire system and ended up being the sensor. They seem to go bad without reason and has happened to a lot of folks here. Replaced it and the jeep cranked up immediately. good luck!!!!
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Unread 08-25-2011, 03:12 PM   #5
midnight_f150
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Thanks guys for the help I will pass this info on to him.
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Unread 08-25-2011, 05:15 PM   #6
Mark05059
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even though the fuel pump may be working make sure that the injector itself is squirting fuel. if it isnt and it has no spark its generally the crank sensor.
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Unread 08-26-2011, 04:00 PM   #7
midnight_f150
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Quote:
Originally Posted by nembudonna View Post
Check the spark control module. It's on the passenger side firewall.
I talk to him today and he said that he has already replaced the spark control module. He is going to work on it this weekend and check out the crank sensor. He said thanks for the help and info.
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Unread 08-26-2011, 09:46 PM   #8
Que89YJ
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I agree. No fuel from the injector is a bad pick up in the distributor. no spark is usually it bad crank sensor.
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Unread 08-27-2011, 04:16 AM   #9
Mark05059
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Q when my crank sensor went out I didnt have either spark or fuel at the injector (the fuel pump would run) The pickup in the distributor was fine... changed the crank sensor and all was good again.
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/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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Unread 08-27-2011, 06:39 AM   #10
Que89YJ
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Yes. Crank sensor ostensibly both injector and spark. Cam is injector. X2 Doing this from my cell is a pita.
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Unread 08-27-2011, 08:40 AM   #11
Mark05059
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Quote:
Originally Posted by Que89YJ View Post
Yes. Crank sensor ostensibly both injector and spark. Cam is injector. X2 Doing this from my cell is a pita.
ditto
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/l , [____],
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Unread 09-07-2011, 05:33 PM   #12
midnight_f150
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Charlie got it fixed it was the Crank sensor wire. Something chewed the wire to the sensor into. He wanted me to tell all of you thanks for the help and info. He said it started right up and I pulled the clutch in and it went to the floor. He checked the clutch master cylinder and it was bone dry. He is going to work on that saturday but was wonder if yall had any tips for him.
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Unread 09-08-2011, 05:43 AM   #13
Quags
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CPS every time!!! LOL
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[url]http://s1196.photobucket.com/albums/aa409/Quags1/1992%20Jeep%20Wrangler%20Project/[/url]
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