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Unread 01-08-2016, 06:37 AM   #1
Diverdown87
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1998 TJ Wrangler 
 
Join Date: Jun 2011
Location: Freakville, FL
Posts: 805
Resetting the ECM

I recently replaced the transmission in my 98 TJ. About 8 months before was the engine. Both are remanufactured and not junkyard specials or rebuilds. When I had the engine replaced I get the tech a distributor I bought from Rock Auto, the OEM was starting to squeal so I thought the bearings were going bad.

Now when I am driving and I give it gas it wants to back fire, bog down, surge then go. I am wondering if flashing the ECM will set it back into Adaptive Mode and relearn. I have been looking at these threads:
http://www.jeepforum.com/forum/f13/q...et-pcm-948495/

http://www.jeepforum.com/forum/f11/r...sed-xj-899735/

http://www.jeepforum.com/forum/f11/t...mputer-784485/

http://www.jeepforum.com/forum/f11/b...05/index2.html

but they all seem to be XJ related. I am not sure if this will work on my TJ. I don't want to fry the ECM and be totally screwed so I figured I better ask here. I have already replaced the plugs, wires, cap/rotor, MAP, TPS, and both O2 sensors.

Another thing I am wondering is if this reset does work while it is in adaptive mode will it relearn the manual shift points too? I have 4.56 gears, Truetrac f/r, 5spd, and 35" tires. Seems when I drive and hit 5th the shift light will stay on until I get to about 65/70 mph. All the shift points seem to be sooner now that I have the larger tires on it.

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98 TJ 4.0L, 5spd, 4.25 Zone lift, D-locked D30/D35 w/4.56 gears, MCE GEN I Flares, 33" Trxxus ATs, Engo 10K# winch, rear disc brake conversion.

My idea of help from the man above is a sniper on the roof.
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Unread 01-08-2016, 07:01 AM   #2
TheBoogieman
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2003 TJ Wrangler 
 
Join Date: Aug 2006
Location: Charlottesville, Va
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Quote:
Originally Posted by Diverdown87 View Post
Seems when I drive and hit 5th the shift light will stay on until I get to about 65/70 mph.
There's nowhere else to shift. My light doesn't come on in 5th gear.
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Unread 01-08-2016, 07:22 AM   #3
Diverdown87
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1998 TJ Wrangler 
 
Join Date: Jun 2011
Location: Freakville, FL
Posts: 805
Quote:
Originally Posted by TheBoogieman View Post
There's nowhere else to shift. My light doesn't come on in 5th gear.
Yeah...exactly....

Thats why I am thinking flashing the ECM will allow it to relearn the shift points with the bigger tires and gears. Unless it has something to do with the speedometer gear and I need to change it again.
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98 TJ 4.0L, 5spd, 4.25 Zone lift, D-locked D30/D35 w/4.56 gears, MCE GEN I Flares, 33" Trxxus ATs, Engo 10K# winch, rear disc brake conversion.

My idea of help from the man above is a sniper on the roof.
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Unread 01-08-2016, 09:35 AM   #4
JWebber
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1999 TJ Wrangler 
 
Join Date: Aug 2011
Location: Lewisville, Texas
Posts: 1,367
Check your fuel pressure. and or timing is off by one tooth at cam gear.
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