88jeep1

Nope I used a clean vacuum hose. Haha funny guy.

Nope

Could this be one of the idle problems?? Looks caked up? This engine did sit 2 years in its donor truck before I pulled it. The IAT had stuff on it as well. I cleaned it too.

Yes what I said in the previous msg was just what I seen the rem was reading. It was just after I cleaned it I seen it go into closed loop setup. It was staying on open before. I'm gonna do some more chk stuff tomorrow. I have done alot of things prior just need to look at the tips to check out other areas.

So I read somewhere about cleaning the I AT on the intake. I cleaned it and all of a sudden my lean/ open loop went to displaying closed and now lean/rich changing back and forth. I believe I have uncovered alittle of my problem. It went to closed loop almost immediately after cleaning the iat.

I changed the cracked one out. I got another used one that was good tho it came with a used O2 sensor in it. I just through it back on the head with a new gasket and all bolts torqued.

The rpm fluctuates on the rem from about 586-619. When it's cold my oil pressure is about 80 on the cluster gauge after first start if that's even a good thing to go by. Seems to mellow out after it warms up more. It never quite goes away. The other thing I noticed if I rev it alittle not alot of rpms it almost seems like it's going to fall on its face trying to recoupe from being rev'd alittle.

I have to go to work now. I will try that tomorrow to see what I end up with. I had a cracked exhaust manifold. When I got another used one I never changed the O2 out. Just reused the one that was in it. Testing on that stuff tomorrow thanks!

I put a newer ecu in was told it would open a few more HP's up and mellow the idle out even more. It's a bendix 428 out of a newer auto XJ.

When the rem is plugged in running it says just after start up 15tps, 13.6-14.1map, 15.4-15.7vac, 14-15ign, 586-619 rpm, 14.0battery volts, 0.70-(4.96 on occasion)vO2, says Lean ex, open lp.

Also when I got this truck the emissions container was missing as well. Could a vacuum/plug setup be missing from it not being on the firewall?? Like needing a signal to run better? I have one on my donor 88 stick mj I could install. What do you think on that?

Ok so I have 82 then the tps would be good right? I just did the coil terminals cleaned and sandpapered. Plugs cleaned on it. Also a while back the grounds were upgraded to 0 gauge head to firewall the dipstick grounds were cleaned and a bigger ground added to a bolt near the engine mount.

Also I will add I cleaned the c101 with crc electronics cleaner couple months back. Just to rid it of all that black tar crap. I actually did as many plug in the engine bay as I could see with the cleaner. Then let them air dry before I plugged them back in.

I did the flat 3 wire and got 4.87 b to a. I did the b to c and got .763. what is my desired number suppose to be? It says move the tps till I have my desired amount but doesn't tell me what I'm shooting for?

Thanks for answering. I will do this tomorrow and see what I come with. I also want to add I have an REM as well. If there's something on it I could tell you when it's plugged in let me know.

88 mj 4.0 aw4 4x4. Did upgrade injectors new timing set, oil pan, rear main seal, water pump along Iac, Tps, coolant temp sensor, plugs,wires,cap,rotor, Upgrade factory computer to run renix system better. Also fuel pump is original to my knowledge with a new fuel filter if that helps at all. The truck has an eratic idle. It seems to respond well when I blip the throttle. What I notice is the engine comes back down after the rev back to an idle and it seems to drop sudden. Then it catches itself and picks back up in rpm. If I don't touch the pedal it sits and idles. Just isn't smooth has like a roughness to it or like a miss. Any help with this would be greatly appreciated! I will do my best to do the tests you guys suggest and report back. I just need someone that knows these alittle better that can help me out on this project of mine.