cruiser54 Posted April 17, 2014 Author Share Posted April 17, 2014 Where is the ECU located? Up under the dash to the right of the steering column. Held in with three 10mm headed bolts. Link to comment Share on other sites More sharing options...
cruiser54 Posted August 18, 2014 Author Share Posted August 18, 2014 Anyone else done the ECU swap yet? Link to comment Share on other sites More sharing options...
91Pioneer Posted August 18, 2014 Share Posted August 18, 2014 Anyone else done the ECU swap yet? I thought about it but figured it's probably not worth it since I have a standard and really don't drive it hard, rarely rev or shift over 2,500. If I had an auto (read: stronger trans) I likely would do the swap. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 18, 2014 Share Posted August 18, 2014 I have the ecu , but until my back is a 100% I don't want to be twisted under the dash changing it . Link to comment Share on other sites More sharing options...
cruiser54 Posted August 18, 2014 Author Share Posted August 18, 2014 Actually, it's easier to remove the 3 nuts. I'll have a photo here soon to help. Image Not Found Link to comment Share on other sites More sharing options...
88ComancheMitch Posted August 19, 2014 Share Posted August 19, 2014 Hmmm...I believe, and correct me if this is impossible, I am running a 98' HO motor with a 88 ECU. Should I still be looking for a TCU from a 89+? Where is the TCU located? Where the auto shift lever meets the side of the trans? Thanks, Mitch Link to comment Share on other sites More sharing options...
88ComancheMitch Posted August 19, 2014 Share Posted August 19, 2014 Looks like pass side kick panel area in xj's, I'm assuming it's the same on a MJ....if it will make a difference I'll grab one ASAP and report back. Link to comment Share on other sites More sharing options...
conker Posted August 19, 2014 Share Posted August 19, 2014 I'll be doing this upgrade for sure, but my Chief won't be back on the road for a while. Link to comment Share on other sites More sharing options...
cruiser54 Posted August 19, 2014 Author Share Posted August 19, 2014 Hmmm...I believe, and correct me if this is impossible, I am running a 98' HO motor with a 88 ECU. Should I still be looking for a TCU from a 89+? Where is the TCU located? Where the auto shift lever meets the side of the trans? Thanks, Mitch 88 TCU is just fine. It was only 87 that had the morphodite TCU. Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted August 19, 2014 Share Posted August 19, 2014 Changed the ECU today ....kinda. Took out the old ecu and plugged in the 5428 ecu and left it sitting on the transmission tunnel . I do notice better throttle response / less hesitation . I changed the ECU's back and forth to confirm it wasn't in my head . It is a noticeable improvement , not a supercharger but a good plug and play upgrade . FWIW I have 88 with auto and a 4.7 stroker . I already have a polished stainless exhaust header and a 2.5 full stainless exhaust with no crush in the down pipe . Thanks Cruiser . Link to comment Share on other sites More sharing options...
cruiser54 Posted August 19, 2014 Author Share Posted August 19, 2014 Changed the ECU today ....kinda. Took out the old ecu and plugged in the 5428 ecu and left it sitting on the transmission tunnel . I do notice better throttle response / less hesitation . I changed the ECU's back and forth to confirm it wasn't in my head . It is a noticeable improvement , not a supercharger but a good plug and play upgrade . FWIW I have 88 with auto and a 4.7 stroker . I already have a polished stainless exhaust header and a 2.5 full stainless exhaust with no crush in the down pipe . Thanks Cruiser . Yeah man. Now we're talkin'. Link to comment Share on other sites More sharing options...
88mjblue Posted March 16, 2015 Share Posted March 16, 2015 88 with the BA 10/5 here, is it really worth the upgrade? Any difference in the upgrade on an auto vs. manual? Link to comment Share on other sites More sharing options...
Rockfrog Posted March 16, 2015 Share Posted March 16, 2015 I noticed the same results with my 88 4.0 5spd (Ba 10/5) ... Crisper throttle response, and smoother acceleration. I no longer have a bouncing throttle prior to warm up as well. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16, 2015 Author Share Posted March 16, 2015 I noticed the same results with my 88 4.0 5spd (Ba 10/5) ... Crisper throttle response, and smoother acceleration. I no longer have a bouncing throttle prior to warm up as well. So, was it worth it? LOL. Put a set of 746 injectors in it if you haven't already. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 16, 2015 Share Posted March 16, 2015 Gotta keep polishing that turd in the never ending quest toward HO perfection. :rotfl2: Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16, 2015 Author Share Posted March 16, 2015 Gotta keep polishing that turd in the never ending quest toward HO perfection. :rotfl2: Oh, we've surpassed that long ago. Link to comment Share on other sites More sharing options...
88mjblue Posted March 16, 2015 Share Posted March 16, 2015 I noticed the same results with my 88 4.0 5spd (Ba 10/5) ... Crisper throttle response, and smoother acceleration. I no longer have a bouncing throttle prior to warm up as well. Thanks for the response – exactly what I was looking for, just an extra bit of confirmation before I pull an ECM from the local pull and pay (they charge $30) Link to comment Share on other sites More sharing options...
Rockfrog Posted March 16, 2015 Share Posted March 16, 2015 Meh! I have Mustang injectors already. I find my Renix to be no more problematic than my HO ... And simple to fix when things go wrong. I had the choice to convert to OBD I when I picked up the 92 XJ for parts, chose not and just swapped the common parts between the two. I like my Renix. There I said it, commence the stoning already ya weenie buncha HObum's It's still rolling the stock D35, BA 10/5 and still uses the stock CPS. I may have adjusted things as they literally fell apart after 27yrs (rad crumbled in my hands prompting the rad swap to open cooling as that's what I had on hand). Most of the problems have always been wiring related ... an issue common to all three 4.0 engine management platforms (and the 2.5 and 2.8 for that matter, with the 2.8 being the only real problem in the lot). Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16, 2015 Author Share Posted March 16, 2015 Meh! I have Mustang injectors already. I find my Renix to be no more problematic than my HO ... And simple to fix when things go wrong. I had the choice to convert to OBD I when I picked up the 92 XJ for parts, chose not and just swapped the common parts between the two. I like my Renix. There I said it, commence the stoning already ya weenie buncha HObum's It's still rolling the stock D35, BA 10/5 and still uses the stock CPS. I may have adjusted things as they literally fell apart after 27yrs (rad crumbled in my hands prompting the rad swap to open cooling as that's what I had on hand). Most of the problems have always been wiring related ... an issue common to all three 4.0 engine management platforms (and the 2.5 and 2.8 for that matter, with the 2.8 being the only real problem in the lot). I probably have the same injectors as you on my 3 family Jeeps. I installed the 746s on my neighbor's 87 and they are really nice. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 16, 2015 Share Posted March 16, 2015 Mission accomplished. A slow night on the CC livened up with some justified Renix bashing. It's too easy. Link to comment Share on other sites More sharing options...
Rockfrog Posted March 16, 2015 Share Posted March 16, 2015 Troll! Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16, 2015 Author Share Posted March 16, 2015 Mission accomplished. A slow night on the CC livened up with some justified Renix bashing. It's too easy. LOL. You're just jealous you don't have something as simple and efficient as a rEnix. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 16, 2015 Share Posted March 16, 2015 LOL. You're just jealous you don't have something as simple and efficient as a rEnix. Yep, I'm jealous. But you do see the big picture. Controversy breeds knowledge. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16, 2015 Author Share Posted March 16, 2015 LOL. You're just jealous you don't have something as simple and efficient as a rEnix. Yep, I'm jealous. But you do see the big picture. Controversy breeds knowledge. Hell yes. I'm all over that!! I drink IPAs/microbrews and I'm guessing you're a Miller guy...Correct? Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 16, 2015 Share Posted March 16, 2015 Correct. I'm simple and efficient. Link to comment Share on other sites More sharing options...
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