michael Posted May 3, 2014 Share Posted May 3, 2014 hey guys i just put in a 96 grand Cherokee engine in my 88 comanche. i put a egr block on the intake. but when i start it and it idles down it runs smooth and sounds good. when i hit the gas and it gets to about 1500-2000 rpm it back fires out the exhaust and won't rev any higher. would any one have any ideas what this might be? also when i unplug the vac to the map sensor it runs really rough but will then rev up to about 3000 before it back fires/. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted May 4, 2014 Share Posted May 4, 2014 Did you swap distributors? They are different between the Renix and HO ones. But, assuming you did, make sure you set it down in the block correctly. I found this out the hard way. SAME symptoms you're describing. I was one tooth off on my timing and had to redo it. Referred to the following. Link to comment Share on other sites More sharing options...
Jeep Driver Posted May 4, 2014 Share Posted May 4, 2014 What fly wheel are you using? Link to comment Share on other sites More sharing options...
MuddFoot Posted May 4, 2014 Share Posted May 4, 2014 What fly wheel are you using? x2 Link to comment Share on other sites More sharing options...
JeepcoMJ Posted May 4, 2014 Share Posted May 4, 2014 Did you port match the renix manifolds and the high output head? Link to comment Share on other sites More sharing options...
michael Posted May 4, 2014 Author Share Posted May 4, 2014 great news!!! i was one tooth off, even with this post when put it in it didnt look right, but hey it runs now so THANK YOU so much!!!! i wouldnt have tried that i don't think because it looked dead on before. also I'm am running the 88 flywheel and distributor. i port matched the head some, i went about halve way on each runner, but as this was the first time doing anything like that and not having the proper tools i didnt wanna get into a water jacket or mess the head up. so i opened it some. thank you guys again, you have helped me before and now again!!!! i was so frustrated!!!! :doh: :???: :mad: :headpop: Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted May 4, 2014 Share Posted May 4, 2014 Glad you got it resolved. :cheers: Link to comment Share on other sites More sharing options...
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