Tony el Tigre Posted September 29, 2018 Share Posted September 29, 2018 Hey guys! I've got an open-ended question that is probably a little too broad, so apologies in advance (breaking the rules by apologizing!) I have a 1987 Jeep Comanche base model that randomly stopped working on me a few weeks ago. Haven't had the time to troubleshoot, but I'm not too sure where to start. Background is that it never had any real big issues until now. I was driving back home and the power randomly cut out while driving forcing me to pull over. Electronics and all still worked but the car was getting no power. It started and died a few more times before it finally gave out and I got towed home. Now it is looking very clean in the front yard but not going anywhere. It tries to crank but doesn't start. I've done basic things like clean grounds, new battery, checked fuses and relays and that's pretty much where my knowledge ends. Does anyone have any suggestions or recommendations? I'm happy to answer more questions if that helps diagnose! Link to comment Share on other sites More sharing options...
87MJTIM Posted September 29, 2018 Share Posted September 29, 2018 CPS. crank position sensor. Search cruiser’s tips Link to comment Share on other sites More sharing options...
Ωhm Posted September 29, 2018 Share Posted September 29, 2018 Engine??? Trans??? Link to comment Share on other sites More sharing options...
Pete M Posted September 29, 2018 Share Posted September 29, 2018 yup, start running through Cruiser's tips. should be the first link in the link in my sig. one of them is refreshing grounds, specifically the one behind the drivers side taillight which grounds the fuel pump. Link to comment Share on other sites More sharing options...
Eagle Posted September 29, 2018 Share Posted September 29, 2018 1 hour ago, 87MJTIM said: CPS. crank position sensor. Search cruiser’s tips Link to comment Share on other sites More sharing options...
gogmorgo Posted September 29, 2018 Share Posted September 29, 2018 http://www.cruiser54.com Is it really that tough to remember? Link to comment Share on other sites More sharing options...
Tony el Tigre Posted September 29, 2018 Author Share Posted September 29, 2018 Thanks gents! Looks like I'm going to have a field day going through that list Link to comment Share on other sites More sharing options...
cruiser54 Posted September 29, 2018 Share Posted September 29, 2018 5 hours ago, Tony el Tigre said: Thanks gents! Looks like I'm going to have a field day going through that list Which engine do you have? The CPS can be tested. It's in one of the tips..... But, just for fun, unplug it and plug it back in and see what happens. The ground the taillamp is huge. Do it right away. There's a Tip for upgrading that ground also. Should be done. C101 connector refreshing is also huge. Do that. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 29, 2018 Share Posted September 29, 2018 10 hours ago, Pete M said: yup, start running through Cruiser's tips. should be the first link in the link in my sig. one of them is refreshing grounds, specifically the one behind the drivers side taillight which grounds the fuel pump. Pete, those tips you refer to in the link are totally outdated. Best to use www.cruiser54.com. thanks. Link to comment Share on other sites More sharing options...
Pete M Posted September 30, 2018 Share Posted September 30, 2018 I've updated the links I can find in the DIY list. not sure about where else they would be though. Link to comment Share on other sites More sharing options...
Jeepzahn Posted September 30, 2018 Share Posted September 30, 2018 On 9/29/2018 at 2:25 AM, Tony el Tigre said: Thanks gents! Looks like I'm going to have a field day going through that list What is the status? Figure out anything @Tony el Tigre? If not, do you hear the fuel pump cut on when you turn on the ignition? Link to comment Share on other sites More sharing options...
Tony el Tigre Posted October 1, 2018 Author Share Posted October 1, 2018 I've been doing a lot of cleaning under the hood and haven't struck gold yet. I'm thinking the next thing to tackle is the CPS. Getting to it looks like a great time! C101 was a sludgy mess and I got that cleaned up. I can hear the fuel pump cut and the injectors are getting fuel. On another note, would rotting hoses be enough to keep the engine from starting? Either way they're getting replaced For those asking, it's the 4L straight 6. Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted October 4, 2018 Share Posted October 4, 2018 FWIW, I just changed the CPS in my MJ (4.0L BA10-5 transmission). To be able to get my gorilla sized hands and arms in place I ended up taking the transmission crossmember off and allowing everything to rotate around the engine mounting points, effectively lowering the transmission. It bought me an extra 4" of clearance or so, which made it possible to get my hand up to the CPS and guide the socket. Only took an extra 30 minutes to do this as well, so its worth it IMO. I also used (literally) every single extension I own and came at it from the space above the transfer case. Good luck with it. Link to comment Share on other sites More sharing options...
Eagle Posted October 4, 2018 Share Posted October 4, 2018 On 10/1/2018 at 12:15 PM, Tony el Tigre said: I've been doing a lot of cleaning under the hood and haven't struck gold yet. I'm thinking the next thing to tackle is the CPS. Getting to it looks like a great time! C101 was a sludgy mess and I got that cleaned up. I can hear the fuel pump cut and the injectors are getting fuel. On another note, would rotting hoses be enough to keep the engine from starting? Either way they're getting replaced For those asking, it's the 4L straight 6. The CPS is the first thing you should have checked, as several people suggested. Don't replace it unless you have tested it and found that it's bad. If you do the A/C voltage test and you're getting a good reading, then the CPS isn't the problem and you need to look elsewhere. Link to comment Share on other sites More sharing options...
Tony el Tigre Posted October 15, 2018 Author Share Posted October 15, 2018 Late reply here, but it as the CPS all along! Thank you all for your help. Link to comment Share on other sites More sharing options...
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