maddmatt Posted December 3, 2006 Share Posted December 3, 2006 Hello all, Last summer I was driving my truck (MJ) through my yard and the field behind my house, something kept shorting out (I think) the engine would die and i'd have to start it up again and again. Then finially it stoped and it will not start back up. The engine cranks over but I don't think i'm getting any spark. Does anyone know what causes this? Thanks for any help, Matt Link to comment Share on other sites More sharing options...
Eagle Posted December 3, 2006 Share Posted December 3, 2006 CPS (Crankshaft Position Sensor) Link to comment Share on other sites More sharing options...
maddmatt Posted December 3, 2006 Author Share Posted December 3, 2006 Thanks, where is that located on the 4 cylinder engine? Matt Link to comment Share on other sites More sharing options...
Pete M Posted December 3, 2006 Share Posted December 3, 2006 Link to comment Share on other sites More sharing options...
maddmatt Posted October 22, 2007 Author Share Posted October 22, 2007 I changed the CPS and it still does not start. It cranks over but no spark. :???: Link to comment Share on other sites More sharing options...
over2land Posted October 22, 2007 Share Posted October 22, 2007 What year? does it have the C101 connector on the firewall? That dang thing is notorious for bad connections. Link to comment Share on other sites More sharing options...
maddmatt Posted October 23, 2007 Author Share Posted October 23, 2007 Sorry 1987 2.5L 4x4 shortbed auto , I don't kno if it has a c101? Link to comment Share on other sites More sharing options...
Oizarod115 Posted October 23, 2007 Share Posted October 23, 2007 Sorry 1987 2.5L 4x4 shortbed auto , I don't kno if it has a c101? i THINK he's talkin about the connector from the CPS to the harness... try electrical contact cleaner in there and a good shaking. (oh and make sure to plug it back in ;) ) other than that, have you checked the dist? Link to comment Share on other sites More sharing options...
FxRacing282 Posted October 23, 2007 Share Posted October 23, 2007 have you checked all the plugs Link to comment Share on other sites More sharing options...
Eagle Posted October 23, 2007 Share Posted October 23, 2007 Sorry 1987 2.5L 4x4 shortbed auto , I don't kno if it has a c101? i THINK he's talkin about the connector from the CPS to the harness... try electrical contact cleaner in there and a good shaking. (oh and make sure to plug it back in No, he's not. The C101 connector is located high on the firewall, above the brake booster vacuum reservoir. The entire engine harness goes into it before going through the firewall to the ECU. There is a known problem with the early Renix ('86 thru mid-89) harness losing the CPS signal. Jeep sells a replacement CPS that comes with a 2-wire harness. You abandon the stock harness, drill a hole through the firewall for the new harness, and run the two wires directly to the ECU. That may or may not correct the problem. It always has for me in the past. However, the curremt no spark with the '88 MJ that isn't the problem. The new CPS is only generating 0.23 volts and it should be generating 0.5 to 0.8 volts. But the dealership won't acknowledge that there's anything wrong with the part, so I'm sort of, errr ... screwed. Link to comment Share on other sites More sharing options...
Oizarod115 Posted October 23, 2007 Share Posted October 23, 2007 oh... gotcha, i was thinking of the same connector then, i just didn't know where it went. :roll: thats the one you have to wiggle on the XJ periodically when she gets cranky and won't start. Link to comment Share on other sites More sharing options...
ejndssn Posted October 23, 2007 Share Posted October 23, 2007 I've zipped tied these connections in the past with good results. the down side is when change trannies or clutches and in my case went from puke joe to ax-15 internal slave to external slave and have and internal YJ in the garage in vgood condition. Link to comment Share on other sites More sharing options...
maddmatt Posted October 24, 2007 Author Share Posted October 24, 2007 how much does this new connection cost from the dealer? how hard is it to install? I think this might be over my head, how much does it cost to have done? I'm starting to hate this truck! :mad: Link to comment Share on other sites More sharing options...
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