kaidenlem Posted September 17 Share Posted September 17 Been having issues with my 89 here over the last few days. First off, it has never ran good since I purchased it nearly 2 years ago. It will try and fire SOMETIMES, other times I get nothing. It has a new fuel pump with new filter, new coil, new plug wires, new plugs, new cap and rotor, new injectors, new tps, and cleaned off the cps. Anyone had an intermittent spark issue on these? I've troubleshot everything I could think of and have made it no where in the last 2 days. IMG_6117.mov Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 17 Share Posted September 17 One thing I couldn’t help notice was no mention of grounds. Are all those clean? Link to comment Share on other sites More sharing options...
89 MJ Posted September 17 Share Posted September 17 I agree with above. Start with grounds. If that doesn’t do it, how does all of the wiring look? Check for power at each of the components when you’re having this issue. Does this issue seem to depend on temperature? Maybe some of your ignition components are getting heat soaked. Link to comment Share on other sites More sharing options...
Spinnakerblue89 Posted September 17 Share Posted September 17 I had a few minor electrical issues until I fixed the grounds and added a few. I also upgraded the cables under the hood. Link to comment Share on other sites More sharing options...
kaidenlem Posted September 17 Author Share Posted September 17 18 hours ago, eaglescout526 said: One thing I couldn’t help notice was no mention of grounds. Are all those clean? Went through and cleaned all grounds that I could find, including the starter and coil relay…battery posts are clean as well. Unplugged every sensor while testing and cleaned with electrical cleaner and reinstalled. 17 hours ago, 89 MJ said: I agree with above. Start with grounds. If that doesn’t do it, how does all of the wiring look? Check for power at each of the components when you’re having this issue. Does this issue seem to depend on temperature? Maybe some of your ignition components are getting heat soaked. It depends. Started fine after sitting the other day and after heat soaking. My next guess would either be the cps going bad or ignition module. Only way I know this is by unplugging cps, waiting a couple minutes, then will try to fire but still will not. 4 hours ago, Spinnakerblue89 said: I had a few minor electrical issues until I fixed the grounds and added a few. I also upgraded the cables under the hood. I plan to do a full wiring upgrade kit on this thing, especially since I plan on it being my DD truck. Link to comment Share on other sites More sharing options...
Spinnakerblue89 Posted September 17 Share Posted September 17 I can relate. My '93 ZJ left me in the parking lot at work one night. It would crank and crank and crank, but never turn over. So, I happened to have a new ignition coil because I was able to snag a good one for a few bucks. I'm sure it helped but it still did nothing to resolve the issue. Well it was the CPS alright, I finally replaced the sensor and made sure the timing was just right, and it fired up no issue. You may be on to something with the CPS. Link to comment Share on other sites More sharing options...
kaidenlem Posted September 17 Author Share Posted September 17 16 minutes ago, Spinnakerblue89 said: I can relate. My '93 ZJ left me in the parking lot at work one night. It would crank and crank and crank, but never turn over. So, I happened to have a new ignition coil because I was able to snag a good one for a few bucks. I'm sure it helped but it still did nothing to resolve the issue. Well it was the CPS alright, I finally replaced the sensor and made sure the timing was just right, and it fired up no issue. You may be on to something with the CPS. It definitely seemed odd that it had ran perfectly fine, then wouldn’t start the next morning. Cranked and cranked and cranked, not even a pop. I unplugged and waited maybe 10-15 minutes, came back out, and tried to fire. Even if it is the cps, definitely plan on redoing every ground I can, especially since I plan on driving the hell out of it lol. Also I’m not super worried on replacing things like that, mostly since they aren’t expensive and that way there’s less chance of them failing (maybe but China) Link to comment Share on other sites More sharing options...
Spinnakerblue89 Posted September 17 Share Posted September 17 Just now, kaidenlem said: It definitely seemed odd that it had ran perfectly fine, then wouldn’t start the next morning. Cranked and cranked and cranked, not even a pop. I unplugged and waited maybe 10-15 minutes, came back out, and tried to fire. Even if it is the cps, definitely plan on redoing every ground I can, especially since I plan on driving the hell out of it lol Yeah my ZJ drove just fine and then suddenly it took an electronic crap. I had no warning. Far be it from me to know for sure how you can test them, as my ZJ gave me the DTC code which narrowed everything down significantly, but there has to be a way you can test that it's the CPS or IC. Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 17 Share Posted September 17 Have you verified the output of the CPS? .02VAC is the absolute bare minimum Renix will trigger the coil off of. Link to comment Share on other sites More sharing options...
Eagle Posted September 22 Share Posted September 22 On 9/17/2024 at 5:37 PM, Spinnakerblue89 said: I can relate. My '93 ZJ left me in the parking lot at work one night. It would crank and crank and crank, but never turn over. You DO realize that if the starter is making the engine rotate, that's "turning over" -- right? What you man is that it cranked over but didn't fire. Link to comment Share on other sites More sharing options...
Spinnakerblue89 Posted September 22 Share Posted September 22 Misspoke, it happens. Link to comment Share on other sites More sharing options...
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