Chuck Posted November 16, 2006 Share Posted November 16, 2006 Went out to the garage to start my 89 Comanche yesterday. The 4.0 cranked over fine, but it took longer than usual to start. I was beginning to think it wasn't going to start when it finally started up. I drove the two miles to work and shut it down. Started fine when I went to the bank 30 minutes later, and started up just fine again when I left the bank. Got ready to come home last night, and all it would do is crank. It had been 45 degrees all day with a blowing light rain. I went back up last night to try and shoot some ether in it, thinking maybe it would start and I could get it home and in the garage to work on it. However, I could not get it to even hit on ether. I tried spraying it above the air filter to make sure it would suck it into the intake as well. I changed the cap and rotor, along with all six plugs and wires about three months ago when I gave it a good tune-up. I put a set of Ford 19 lb injectors in it earlier this year. The MJ has about 185,000 miles on it. I changed out the cps about 4 years ago when it left me stranded one night. I changed out the fuel pump with one from NAPA two years ago. I can hear the fuel pump run and cycle like it should. Once the Jeep started yesterday, it ran just fine. Any ideas? Plans are to take a timing light up with me today and see if there is any spark at the plugs. Link to comment Share on other sites More sharing options...
Chuck Posted November 16, 2006 Author Share Posted November 16, 2006 Went back up this morning with a few tools. Hooked up the timing light to check for spark, cranked and it started. Worst of luck. Now I have to figure out why it wouldn't start so it doesn't end up stranding me somewhere. The only difference in weather is the rain has stopped and the humidity is a little lower. Any ideas? Link to comment Share on other sites More sharing options...
ORCA Posted November 16, 2006 Share Posted November 16, 2006 Reading your first post: -how old is the starter itself? (You may want to swap/clean with dielectric spray) -water in the cap? (WD-40 helps with that) -check for loose wires (starter, battery, cap-to-injectors, etc) Thats all I can really think about off the top of my head. When my mj was acting alittle similar to yours it ended up being a dying fuel pump (I thought it was an electrical short somewhere :roll: ) You must keep in mind that it's a Jeep. They do strange things for no reason every now and again. :nuts: Link to comment Share on other sites More sharing options...
JOMJ87 Posted November 16, 2006 Share Posted November 16, 2006 The electrical componets as far as the starter and battery don't sound like the issue. But have you changed your coil maybe that could be it. Cole Link to comment Share on other sites More sharing options...
Chuck Posted November 16, 2006 Author Share Posted November 16, 2006 I don't think the starter is the problem as it cranks over well. The starter and battery were replaced two years ago. I have pulled the CPS off to make sure it is clean and am in the process of putting it back on. The coil is original. I may end up replacing it. I did pull as many of the electrical connections apart this summer and cleaned all of them with electrical contact cleaner before putting them back together. The thing that struck me most last night was if seemed to be acting like it wasn't getting any spark. That's why I thought of cleaning the CPS up. Next I may have to replace the coil. Hate to get stranded somewhere. Link to comment Share on other sites More sharing options...
Pete M Posted November 17, 2006 Share Posted November 17, 2006 Sometimes the CPS responds to a good cleaning, sometimes it responds to fiddling with the plug, but somtimes it is just dying and needs to be replaced. :( Link to comment Share on other sites More sharing options...
Chuck Posted November 17, 2006 Author Share Posted November 17, 2006 I changed out the CPS today. I will see what happens over the next week. Hopefully this has fixed the problem. Chuck Link to comment Share on other sites More sharing options...
koooooooz Posted November 27, 2006 Share Posted November 27, 2006 mine did the same thing and well i but dioelectric grese (i don't no how to spell it but ya the grease that makes connections better on electrical things 0 on the computer hook up and ya that fixed it needless to say i figured this out after puting a new coil plug wires and destrubuiter :cry: but it works now how this helps Link to comment Share on other sites More sharing options...
Chuck Posted November 28, 2006 Author Share Posted November 28, 2006 Ten days now since I replaced the CPS. It has started fine every time since. Keeps me happy this way. ;) Link to comment Share on other sites More sharing options...
ridergoatee Posted November 28, 2006 Share Posted November 28, 2006 have the same problem with mine,gonna try the cps also. Glad to here that it's workin for ya. Been driving me nuts cuz it doesn't occur all the time. Link to comment Share on other sites More sharing options...
Eagle Posted November 28, 2006 Share Posted November 28, 2006 Three magic words: Crankshaft Position Sensor Link to comment Share on other sites More sharing options...
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