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here we go again 86 jeep comanche 93 jeep cherokee 2.5l engine low idle runs good when cold as the idle drops to normal begins to misfire and it gets worse the warmer it gets to the point it dies and starts itself again.... driving down the road at a low rpm runs fine put any type of pressure on the pedal to accelerate it begins to buck and misfire terrible....... drove to work today stopped to turn and the truck died went to start it, and had to hold my foot to the floor to get it to start.... seems like it lacks fuel but pump sending unit resistor and pressure regulator are brand new. i pulled the plugs to see what was going on and all of the plugs had a nice brown tint to them except the furthest back plug which was still sorta white....

 

list of parts i changed today with no changes....

 

TPS

Distributor

temperature sensor

Crank sensor

fuel pump

fuel injector o-rings

 

parts changed recently.....

 

fuel pump

ballast resistor

fuel pressure regulator

spark plugs

spark plug wires

cap

rotor

 

I checked to see if it was the o2 sensor by unplugging and starting the engine and it did not run any better. i am running out of parts to replace and I'm begining to get annoyed at this point.. I'm about to replace every injector and the coil. i checked the ohms rating of each injector and they were all the same across the board..... i checked the primary and secondary of the coil and it was within the ohms ratings.....

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Check the vacuum tube that connects from the map to the throttle body....

Also do cruisers renix tips to refresh/upgrade your grounds...

http://comancheclub.com/topic/36382-cruisers-renix-tips/

 

Edit: double check if your cps wires aren't touching the exhaust....

I had a similar issue And that was one of my issues and the rear tail light ground...

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Check the vacuum tube that connects from the map to the throttle body....

Also do cruisers renix tips to refresh/upgrade your grounds...

http://comancheclub.com/topic/36382-cruisers-renix-tips/

 

Edit: double check if your cps wires aren't touching the exhaust....

I had a similar issue And that was one of my issues and the rear tail light ground...

see the ground behind the tailight has not been connected since ive owned the truck and ive always wondered where its suppose to connect to i wonder if that would solve my issue or at least help.....

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Check the vacuum tube that connects from the map to the throttle body....

Also do cruisers renix tips to refresh/upgrade your grounds...

http://comancheclub.com/topic/36382-cruisers-renix-tips/

 

Edit: double check if your cps wires aren't touching the exhaust....

I had a similar issue And that was one of my issues and the rear tail light ground...

see the ground behind the tailight has not been connected since ive owned the truck and ive always wondered where its suppose to connect to i wonder if that would solve my issue or at least help.....
It's not connected and still starts?

Just put it back into its existing position...

Well clean to bare metal then bolt it down with a nut and extra washer so it can have a good ground for the fuel pump...

If you can post pics of it so it'll help us help you how to reinstall it ....

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Check the vacuum tube that connects from the map to the throttle body....

Also do cruisers renix tips to refresh/upgrade your grounds...

http://comancheclub.com/topic/36382-cruisers-renix-tips/

 

Edit: double check if your cps wires aren't touching the exhaust....

I had a similar issue And that was one of my issues and the rear tail light ground...

see the ground behind the tailight has not been connected since ive owned the truck and ive always wondered where its suppose to connect to i wonder if that would solve my issue or at least help.....
It's not connected and still starts?

Just put it back into its existing position...

Well clean to bare metal then bolt it down with a nut and extra washer so it can have a good ground for the fuel pump...

If you can post pics of it so it'll help us help you how to reinstall it ....

 

alright i can do that because all there is right now is a wire about 3-4 inches long bolted to the bed and then it goes no where like it was cut not sure what its suppose to mount to but i'll snap some pics and post them asap

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I didn't see any mention of the fuel filter.....

fuel filter was changed as well couple weeks ago

 

Do you have brake lights?

Or any rear lights at all?

yes i do have brake lights the left turn signal doesnt work for some reason but i have taillights brake lights and backup lights any idea where the ground wire that is mounted to the box is suppose to run to and connect?

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Are you asking about the ground for the tail lights?

 

The ground for the fuel pump and the tail lights is located behind the driver's side rear tail light.

yes that ground the one behind the driverside tail light where is it suppose to run to?

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  • 2 weeks later...

:hmm:   It doesn't run to anywhere. The black wire screwed to the sheet metal provides the ground return connection for the fuel pump and the rear light circuits.

ok because i have a wire screwed to the metal behind the tail light and its just hanging there its not connected to anything

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