adobson06 Posted October 31, 2014 Share Posted October 31, 2014 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..... Link to comment Share on other sites More sharing options...
Jeep Driver Posted October 31, 2014 Share Posted October 31, 2014 MAP sensor. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2014 Share Posted October 31, 2014 Renix. Link to comment Share on other sites More sharing options...
adobson06 Posted October 31, 2014 Author Share Posted October 31, 2014 MAP sensor. i havent tried that yet.... was also thinking possibly the intake temp sensor Link to comment Share on other sites More sharing options...
88whitemanche Posted October 31, 2014 Share Posted October 31, 2014 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... Link to comment Share on other sites More sharing options...
adobson06 Posted October 31, 2014 Author Share Posted October 31, 2014 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..... Link to comment Share on other sites More sharing options...
88whitemanche Posted October 31, 2014 Share Posted October 31, 2014 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 .... Link to comment Share on other sites More sharing options...
adobson06 Posted October 31, 2014 Author Share Posted October 31, 2014 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 Link to comment Share on other sites More sharing options...
88whitemanche Posted November 1, 2014 Share Posted November 1, 2014 Do you have brake lights? Or any rear lights at all? Link to comment Share on other sites More sharing options...
mvusse Posted November 1, 2014 Share Posted November 1, 2014 The ground wire by the driver side tail lights is the ground for the fuel pump. Link to comment Share on other sites More sharing options...
tugalo Posted November 1, 2014 Share Posted November 1, 2014 I didn't see any mention of the fuel filter..... Link to comment Share on other sites More sharing options...
adobson06 Posted November 1, 2014 Author Share Posted November 1, 2014 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? Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted November 1, 2014 Share Posted November 1, 2014 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. Link to comment Share on other sites More sharing options...
adobson06 Posted November 8, 2014 Author Share Posted November 8, 2014 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? Link to comment Share on other sites More sharing options...
adobson06 Posted November 12, 2014 Author Share Posted November 12, 2014 problem ended up being a crack in the ignition coil..... Id still like to know where the ground behind the tail light is suppose to run to Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 12, 2014 Share Posted November 12, 2014 :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. Link to comment Share on other sites More sharing options...
adobson06 Posted November 21, 2014 Author Share Posted November 21, 2014 :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 Link to comment Share on other sites More sharing options...
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