cruiser54

Do posts 3 and 5, in that order, next.

Windsor 90 Laredo

Will do. Cruisers info has gotten the jeep this far... Hoping for a home run. On another note I just sea foamed the engine n tank, and never got smoke out the tail pipe. Same thing when I used tap water a long time ago. That ever happen to anyone else?

Windsor 90 Laredo

So I added a ground from the negative batt. Post to a 10mill. Nut on the radiator. Then I checked the flat tps ohm resistance. Wiggled the wire parallel to valve cover, and by the map, and the connector itself. It varied .9-1.0 ohms. Then I back probed the (hooked up) connector (key on) got 4.84v from a and b. but from b and c I got .28v so my output doesn't Match up to the mathematic equation.
That ohm reading is ok to proceed tps adjustment being that small of a variance? Never went over 1.0 or under .9

cruiser54

Ground variance is fine. Your TPS might not be.
For fun, test the trans side of the TPS.

Windsor 90 Laredo

Just did the flat one. Got .82 off of b n c since my reference was 4.84v. 4.84 x 17%=.82
Now to check the transmission connector.
Just fired her up. Idle seemed ok too, so that's good. I still have a small surge when the engine is cold. The valve on the egr barely moves at idle, so that's still an issue. Waiting on a gasket to attack that.

cruiser54

What's wrong with that reading?

Windsor 90 Laredo

Nothing at all. Now the transmission connector reads a 3.72 when I need a 3.85. Is that ok to live with? How would I adjust that to be right without off setting my .82 on the other connector?

cruiser54

Engine side is critical. Trans side is a bit flexible.

That's why I wrote my instructions the way I did. Most instructions had you adjusting a TPS with only the trans side. Not good. No wonder we had som many idle flare issues!!

Windsor 90 Laredo

That's what I figured. Thank u for the help. Cleaned the IAT sensor last night too. That thing was foul!!!

cruiser54

The IATs are generally SNAFU.

Windsor 90 Laredo

Yup, that's how mine looked before and after. After all that was said and done, I went to work in the morning; jeep was its usual self, same leaving work. Went to store, and left with the jeep staying at a high idle. Turned off/on engine. Seemed normal (for this jeep) then left it for ten minutes, went rest of the way home with the high idle again. Remembered what cruiser said about the idle being possibly high after properly setting the tps, but the high idle didnt occur till a fith time driving it after the tps adjustment. Got delayed in attacking the egr but I don't think it's causing the high idle. Didnt see any vacuum line off, but also didnt get to start really troubleshooting. Is it likely the tps?

cruiser54

Quite likely the TPS. One thing you can TRY if you want.

Set the Engine side of the TPS down from .84 to .81 and see what happens.

Windsor 90 Laredo

I'll check that out today. Of coarse the jeep was back to its usual self this morning.
The gasket on the used egr was attached so intensely I seconded guessed myself whether it was supposed to come off.

Windsor 90 Laredo

Cleaned, tested egr on. The pintle stopped moving at idle. The high idle has only returned once today. Turned off and on the engine and it went away. But the slight idle surge remains...
Gonna double check tps, and other sensors. After seeing a u tube video of a guys 89 xj doing the same thing and he replaced every sensor before realizing "uncle bob" the previous owner tampered with the butterfly screw. Is mean his tach was doing the same sh$$ mine is. The butterfly seems to close to the right point. No carbon on it. Am hesitant to mess with it, but if its the answere ill be relieved and pissed. Cruiser I know u got a paragraph on it.

cruiser54

And here it is:


Cruiser’s Renix Throttle Body Butterfly Adjustment

Okay. Let's start from scratch. First off, that's not an idle adjustment screw. It's a throttle butterfly stop screw. It's purpose is to allow the butterfly to be as close to completely closed as it can be without binding or wearing into the throttle body. It was never intended to be adjusted in the field. But, Uncle Bob didn’t know that, did he?

Engine off. Back off the butterfly stop screw with a 3/32” allen wrench until the butterfly is completely closed. Now. turn the screw in until the FAINTEST movement of the butterfly opening is detected. This can be done more easily with the throttle body removed. If you remove the throttle body, be sure to replace the gasket underneath it after thoroughly cleaning the old one off.

Revised 07/07/2012