orange xj

i cleaned the throttle body...but were is the map sensor shouldent it be on the rubber peice the connects to the air box from the tb? and i tried pulling the cps out and re installing it because i heard of that working for some people

Diesel

Stop. Please lol

Test the CPS with a DMM-Renix engine will read 200 ohms +/-75. HO will read infinite if good.

The map sensor is below, follow the vac lines from it, if all are good, test it(testing procedure)- http://www.cherokeetalk.com/forum/f6...rocedure-1261/

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orange xj

and were is my auto shutdown relay..its not with the other 4

orange xj

thanks i will try it out

je4reyk

It more than likely your fuel pump relay,its out by the battery,when they go bad it will start right up but die right afterwards.

rich

Is the ballist rezistor (spelling) dog bone,part of the starting system on the older jeeps like it is on the 80s era dodge pickups or is it just for the fuel pump on a jeep,because on my plow truck I would start it with the key and as soon as I let the key go it would shut back off,I changed the dog bone or ballist rez. And it stayed running.I dont know if this would help or not, but I would like to know about this could someone that knows for sure let me know thanks.

dennis461

Which is why I said check fuel pressure.

The MAP sensor is NOT needed to get these things running.
The ASD Relay is working or it would NEVER fire


check fuel pressure.
check fuel pressure.
check fuel pressure.
check fuel pressure.
then
check fuel pressure.

next check CPS
check CPS
check CPS
check CPS

Diesel

Your right, but he gets it started and it stalls. MAP sensor can cause that. Read.

orange xj

im trying the ignition switch first but i can not figure out how tp pull apart the steering colum? anyone have a write up?

pittman71

Since he stated he could pull out the key and it would still run...Couldnt this be an ignition switch or cylinder problem? I'm curious because a buddy of mine has the same symptoms.

Diesel

Ding, solder joint where the current arcs may be bad.

je4reyk

When you first turn the key on do you here the fuel pump running ? The start circuit on these xjs have a bypass that when the key is in the starting or cranking position the fuel pump relay is bypassed. Starting the fuel pump works,return the key to the run position and no fuel pump voltage! Exchange it with a known good one ,and happy trails .

dennis461

All you ever wanted to know about RENIX, but were afraid to ask..

http://www.greatlakesxj.com/tech/Ren...ion_Manual.pdf

Diesel

Im going to be ignorant for a second. I have worked on dozens of renix jeeps with this problem, multiple times it was the map sensor.

MAP sensor compares ambient barometric pressure during start-up to engine load while engine is running. There you have it, it can still start with a bad map.

je4reyk

True it can be the map sensor, but swapping the relay take like ten seconds.