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Jeep Wrangler YJ
YJ General Discussion
Do ECM's "Break Down"?
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<blockquote data-quote="T-Rex Jeepster" data-source="post: 440012" data-attributes="member: 19821"><p>Having a nightmare issue. When I set this motor up I was advised to set the timing advanced 8 degrees BTDC and she ran for 8,000 mile with no issues...Then she started doing this herky-jerky staggering when you would level out the throttle and try to cruise level speed. Pulled the distributor and she was in BAD shape so I replaced it and set the timing back to TDC and noticed right away that while she idled/ran smooth, She just wasn't as responsive and seemed to have lost power while accelerating and the "Herky-Jerky" Problem got worse. So I went back and reset the timing 8 degrees BTDC and she cranked right up and purred like a kitten at idle...But give it any throttle and it would snap-crackle-pop and just wasn't happy. So I went and checked the crank position sensor and it looked really rough to the point I think it's a possible original from the factory, So I changed it. And she was just a joy to start and drive. No "Herky-Jerky" Great acceleration for a 4.0 and seemed to have all it's "Balls" Back. And then I got seven miles down the road and the bottom fell out, Backfiring, Missing, No power and just died. Called a Buddy got it home in about an hour, Got it off the trailer, Fired it up to get it out of the drive...And the M'Fer acted like a brand new ride! I drove it back and forth on my country road dogging it to the red line and it took it like a champ. I'm at a loss...Could it be that the ECM is "Breaking Down" Like a worn out coil? Could it be the coil? It is after market and I bought it with a "High out put" Package that had a distributor cap and button that didn't last 6,000 miles....Any input on this would be GREATLY appreciated</p></blockquote><p></p>
[QUOTE="T-Rex Jeepster, post: 440012, member: 19821"] Having a nightmare issue. When I set this motor up I was advised to set the timing advanced 8 degrees BTDC and she ran for 8,000 mile with no issues...Then she started doing this herky-jerky staggering when you would level out the throttle and try to cruise level speed. Pulled the distributor and she was in BAD shape so I replaced it and set the timing back to TDC and noticed right away that while she idled/ran smooth, She just wasn't as responsive and seemed to have lost power while accelerating and the "Herky-Jerky" Problem got worse. So I went back and reset the timing 8 degrees BTDC and she cranked right up and purred like a kitten at idle...But give it any throttle and it would snap-crackle-pop and just wasn't happy. So I went and checked the crank position sensor and it looked really rough to the point I think it's a possible original from the factory, So I changed it. And she was just a joy to start and drive. No "Herky-Jerky" Great acceleration for a 4.0 and seemed to have all it's "Balls" Back. And then I got seven miles down the road and the bottom fell out, Backfiring, Missing, No power and just died. Called a Buddy got it home in about an hour, Got it off the trailer, Fired it up to get it out of the drive...And the M'Fer acted like a brand new ride! I drove it back and forth on my country road dogging it to the red line and it took it like a champ. I'm at a loss...Could it be that the ECM is "Breaking Down" Like a worn out coil? Could it be the coil? It is after market and I bought it with a "High out put" Package that had a distributor cap and button that didn't last 6,000 miles....Any input on this would be GREATLY appreciated [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Do ECM's "Break Down"?
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