dustyniner

So I had all of these same issues. I switched ecms and now I have a new issue....wondering if anyone could point me in the right direction now.....the ECM I got is for a 87-88.....I have an 89. Now under load it fails on its face and backfires thru exhaust. By under load primarily going up hill. On flat ground and normal throttle it's fine.....last I checked I had a solid 40psi at the rail. Any help would be greatly appreciated.

Where are you located? What's cheap? Experiencing these same issues currently. Going to check more into all the different key points in this thread tomorrow

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Also I put renix injectors in and I still have a rough idle and a hesitation under 1/4 pedal, anything above that and it runs great shift smooth. I checked vacuum at idle I have about 16 (I think it's psi) on the throttle it's about 20, also checked fuel 40 psi holding nicely.

Got the spark thing figured out, got worked up and panicky cause my truck was sitting in a $#!&ty neighborhood. The metal tab on the rotor cap broke off.....I checked spark at the coil and got shocked and skipped over the distributor.

Put renix injectors in today, still no start, can smell fuel and have spark. Going to test fuel pressure tomorrow. Any ideas at all from anyone?

So I haven't had money to get injectors yet but the truck was running and driving, had a hesitation at anything under 1/4 pedal but above that it ran fantastic, does anyone have any ideas as to what this is. It backfired real bad a few times and stalled today, now it won't run at all

Previous owner had aftermarket 4 hole injectors and one went bad, I found the first set I could find that had the same pigtail connector and threw the in

Okay, I'll look into finding some renix injectors this week

Anyone ever lose brakes in a swap? Developed a super soft pedal, resouvor (sorry for the terrible spelling) is still full of fluid.

I'll check the plugs shortly.....the injectors I'm using are from a 1998 4.0 my block is a 99 4.0. I got the injectors from a junk yard a few months back, they were in the old.motor and I did have a high idle but not a rough idle.

Could using 98 injectors cause a running issue?

Okay, so after a few days of madness trying to find a 5/16 square socket I resorted to grinding an extension down. The CTS is in its correct home on the side of the block. That helped the start up but it's still not running 100% correct. Anymore ideas?

The threads are the same screwed right in

It's still in the coolant.

In my original post I stated that I moved it to the t stat housing and no one said anything. Why is it so crucial to be there? Would it truly affect the running of the truck if it's not there

Did the sensor ground test and got 00.32 ohm and it did not move from that as I was wiggling the wires

All grounds refreshed and 2 added.....no change.....I saw in one of your tips about the coolant temp sensor on the block......does it absolutely need to be down there? I wired mine to the thermostat housing. Does it need to move?

Yes but I'm going threw today after work and adding more and replacing eyelets for grounds after reading threw some of your tips again. Renix intake/exhaust gasket The vacuum line? I just replaced it.

so i indexed the dizzy and no change so i went and bought a new dizzy since part stores did not have the pick up module in stock. still no change in idle. any other tips i should try?

Or could I just replace the pick up in the dizzy?

I meant to out cruisers.....I don't have an extra cap at this second will grab another new one tonight and index the distributor. Does indexing it make that much of a difference?

Not sure what that means to be honest going to look at brusers tips now

So I'm going to tell a little story about my commanche. I'm going to try to remember to cover all the bases of every thing I've done recently and maybe you guys can help me figure out what's wrong. 2 weeks ago my renix 4.0 spun a bearing and within 4.0 miles blew the motor dropped cyl 1. So commence the renix tear down and removal. I had acquired a 99 xj 4.0ho. I had researched that I could out a ho block and head combined with the renix intake for a simple quick swap. While doing this I threw a ton of parts at it. Parts being "hey this would be way easier to change out of the truck". The list Oil pump Rear main seal Plugs/wires Timing chain Cps Valve cover gasket Manifold gasket/bolts T-stat /gasket(used ho housing wired temp sensor from side of block, using the ho sensor) Motor mounts Water pump /gasket Head gasket/bolts O2 sensors. Ground refresh as well Got everything in the truck......it runs rough at idle and runs super rich on intial start up but after it warms up it stops running rich but continues to run ruff. But at higher rpm the rough Ness goes away. Any ideas as to what could cause this. Thank you for your time. 1989 commanche renix 4wd long bed ho block and head renix intake