Dave Stark Posted April 4, 2010 Share Posted April 4, 2010 I've been doing more digging on an '86 MJ with the 2.5. The original CL ad stated that it needs a timing chain & after talking with another person also trying figure out WTF on this thing i found out it has a new(ish) engine. Did these things have a CPS? I know it could be a great many things, but i would like to hear some of the more common issues that would cause a crank but no start situation. I don't know if it is getting spark, or fuel for that matter. They have changed from $1200 down to $800 & maybe lower if i try... I'm considering just buying the thing & testing my luck, but i've already got one semi dead MJ in the drive the wife would kill me if there were two. :help: Link to comment Share on other sites More sharing options...
Geonovast Posted April 4, 2010 Share Posted April 4, 2010 Yes, the 86 2.5 will have a CPS. It's identical to any 86-90 2.5 and 87-90 4.0's CPS. Are you near the truck? CPS can be easily tested with a multimeter without removing the sensor. Link to comment Share on other sites More sharing options...
Dave Stark Posted April 4, 2010 Author Share Posted April 4, 2010 I think i'll look at the truck & i'll make sure to bring a multimeter with me... Link to comment Share on other sites More sharing options...
Geonovast Posted April 4, 2010 Share Posted April 4, 2010 Good plan. Pop off the connector, and set your multimeter to read resistance. Put one probe in the terminal on each wire, and it should read between 125 and 275 ohms. If it's out of that range, it's probably shot. Link to comment Share on other sites More sharing options...
88SporTruck Posted April 5, 2010 Share Posted April 5, 2010 When I got my 88 it would not start at all. Turns out the connector on the CPS harness had gotten wet and was corroded. I took it apart and used some CRC electrical cleaner and a small wire brush and cleaned it up good. Truck fired up on the first crank after that. Just something to look into. Link to comment Share on other sites More sharing options...
jimoshel Posted April 5, 2010 Share Posted April 5, 2010 Same here. I unplugged the CPS connector and made the resistance check. Checked good. Hooked it back up and it ran. Just rubbing the contacts was enough to clean them. A word of caution about getting a non runninig car started B4 buying. I was looking at a 1968 Cadillac I wanted. The seller originally wanted $1600 for it. It would start but would die after a couple seconds and wouldn't start again.He had dropped the price down to $500. After checking it out I jammed the choke open. It started and ran fine. Needless to say the owner immediately raised the price back to $1600. I told him where he could park it. A word to the wise is sufficient. Link to comment Share on other sites More sharing options...
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