Ron at copper
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Posts
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Last visited
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Does it matter that this is a chief? The relay where the ballast resistor is supposed to be does not match any wire colors on my wiring diagram, the relay coil is black and orange the contacts are red and red with a black stripe? Also after I installed the ECU and with the ignition switch off the left turn signal was on and the column sig switch was off so I pulled the signal timer then this morning when I went out to try and trouble shoot I pluged timer back in and it was not on anymore the turn should not come on with ign switch off, correct?. Thinking more about ign switch!
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Fuel pump ballast resistor is not in location described there is a relay there don't know what that is for, could this possibly be caused by a bad ignition switch?
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Well installed rebuilt PCM/ECU no luck still the same old thing 7vdc to fuel pump. I've checked all the grounds that I know about, from batt to chassis, batt to engine,etc. this thing is driving me crazy. I have the input wiring diagram to the PCM but not the output diagram
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I got the ECU out of jeep but the part # on it does not match any of the #s in the PDF you sent me? I ordered one from napa and am a little worried that it won't match what I've got here
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Where exactly is the ECM is it mounted on fire wall? And what kind of $ are we talking about? I checked all the grounds as you described all are 0 ohms and put in new battery still no luck. Please tell me if the attached is the ECM?
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Where exactly is the ECM is it mounted on fire wall? And what kind of $ are we talking about? I checked all the grounds as you described all are 0 ohms and put in new battery still no luck. Please tell me if the attached is the ECM?
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Don't want to sound stupid but what is PCM?
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Help again, the jeep ran fine for about five hours then just did not want to start. Put on the fuel pressure gauge no pressure had a new fuel pump in garage put that on but before I did that checked voltage to pump was 5vdc, installed pump anyway thinking it was the pump relay. Got a new one and installed that,didn't work either so I started checking voltages at relay using a wiring diagram I got from ondemand5direct.com. And to make a long story short I have only 2vdc across the coil on relay and when I go from ground on diagnostic connection to coil terms I get 12vdc to both sides which really has me baffled. Could it be the ign control mod/coil?
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UPDATE! The jeep is back to its same old reliable self. When I installed the last crank sensor I thought I would be smart and tie wraped the excess cable to the fuel line to keep it away from the exhaust pipe, we'll it was too tight and as it curved over the top of the bell housing the movement of the vehicle going down the road caused it to rub a hole in cable exposing the wire to short out intermittently. Thanks so much for you're input!
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Sure I found problem. Was shorting out crank sensor see attachments will get new one. They sure do not put it in a very axcesable place!
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I was looking at the Haynes manual for checking the cps and it said to put an ohm meter on the sensor and " it should read no restiance ( open). We'll I work on commercial and industrial boilers and I know that no restiance is closed! My meter reads 0 which means its a closed circuit. Is this thing a proximity switch? What should it read, infinity or zero?
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Yep! Changed filter first. Know you are probably a busy guy, but I think you are right about crank sensor, about how long do those last? Will try cleaning first. Figured out it's been in there about 7 years but my wife only drives 6 miles per day 5 days a week.
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I had replaced the crank sensor a few years back because it would run fine for awhile then would not start at all. The mileage is high at 227,212 miles. I checked the fuel pressure at 32 psig but did not check capacity. Replaced plugs,dist cap and rotor as well as the wires, just replaced coil when I was trying to trouble shoot the crank sensor.have not replaced alternator could this be problem?
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My 1987 Cherokee 4.0 liter is misfiring when started but when I have clutch depressed it runs fine. Does any one have any ideas? I think a bad TPS but don't want to throw money at something that won't fix it!
