88 4.2 YJ Ignition Module questions - Page 2 - JeepForum.com
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Unread 11-08-2011, 10:00 AM   #16
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1990 YJ Wrangler 
Join Date: Jan 2008
Location: Mazomanie, Wisconsin
Posts: 53
Got a pretty similar thing going on jeepjon. Im going to start working on it tommow. Ill post here the results

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Unread 11-08-2011, 10:30 AM   #17
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1990 YJ Wrangler 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 14,440
Originally Posted by JeepJon15 View Post
But is the HEI alone gunna help if i dont upgrade everything else right away?
Yes, because you're getting rid of the failure prone ICM, you can update everything else later.....

Here's some help.... http://www.jeepforum.com/forum/f12/n...today-1217045/
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
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Unread 11-08-2011, 12:08 PM   #18
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1990 YJ Wrangler 
Join Date: Jun 2008
Location: st. louis
Posts: 1,751
Originally Posted by JeepJon15 View Post
One more thing i thought of that may or may not be connected. Sometimes when i turn the key to start the jeep it seems like theres a power surge where it turns very slowly then speeds up and fires up. As its struggling my lights typically dim a bit then get full power back between engine turns. The starter is only about a year old, maybe a little less. Battery i think is from 04, but can a battery cause shut off problems? It does seem to die rather quickly when trying to get her started on bad days.
That is the classic symptom of bad battery cables. Either replace them or at least replace the ends. If they look original or over 10 years old, just replace them.

Grounding the ignition module like 4x said made a big difference in how mine ran.

I put a new cap, rotor and plug wires on mine when I bought it so put off the Team Rush upgrade for a long time, but it made a big difference too when I finally did it.
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Unread 11-08-2011, 10:27 PM   #19
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Join Date: Nov 2011
Location: Port Orchard, WA
Posts: 27
I once had very similar symptoms on a 76 CJ5. After the engine was warmed up if I hit a bump in the road it would die and not restart for 20 to 30 minutes. Took me forever to figure that one out but it turned out to be a bad connection in the wiring coming out of the distributor at the connection to the wiring harness. If it is nuttered, check all of your connections and especially connections affected by heat from the engine getting hot.

Just my 2 pennies.
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4.2 , ignition module , shut off , starting problems , YJ

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