Jackrabbit41 Posted September 11, 2016 Share Posted September 11, 2016 So just finished tranny swap and now she won't start. She turns over but not firing. My cps was good before but I changed it out anyway thinking it'd be the problem. The thing still won't start. what should I look at next? Link to comment Share on other sites More sharing options...
gogmorgo Posted September 11, 2016 Share Posted September 11, 2016 Did you end up changing the flywheel? Link to comment Share on other sites More sharing options...
Jackrabbit41 Posted September 11, 2016 Author Share Posted September 11, 2016 Did you end up changing the flywheel?Yes I did with the exact same one Would I need a cps for the 95? Not my 87? Link to comment Share on other sites More sharing options...
gogmorgo Posted September 11, 2016 Share Posted September 11, 2016 The flywheel and CPS need to match whatever engine management system you're running. If you're running Renix, you need the Renix CPS and flywheel. If you've got everything from a '95 in there, you'll need the flywheel and CPS for a '95. Link to comment Share on other sites More sharing options...
Jackrabbit41 Posted September 11, 2016 Author Share Posted September 11, 2016 The flywheel and CPS need to match whatever engine management system you're running. If you're running Renix, you need the Renix CPS and flywheel. If you've got everything from a '95 in there, you'll need the flywheel and CPS for a '95. The flywheel I used to have was from the 95 and never had any problems with it. Are you saying that I need to swap flywheel or do I need to go to Napa and get a 95 cps? Link to comment Share on other sites More sharing options...
gogmorgo Posted September 11, 2016 Share Posted September 11, 2016 Do you have an HO in there then? The two systems are not compatible. If the engine management is original to the truck, you'll need a flywheel and CPS for an '87. If you've got the computer and wiring and everything from a '95 in there, you need a '95 CPS and flywheel. Link to comment Share on other sites More sharing options...
1987Comanche Posted September 12, 2016 Share Posted September 12, 2016 The Renix and HO flywheels are mirror images of each other. The tone rings for the CPS pickup are opposite. All the positive teeth on the Renix flywheel are negatives on the HO flywheel. OneOverZero and I put them side by side when we swapped. He had a spare HO flywheel from his jy engine and I had a spare Renix flywheel. My understanding is new Renix flywheels aren't available but I could be wrong. Link to comment Share on other sites More sharing options...
Eagle Posted September 12, 2016 Share Posted September 12, 2016 The flywheel and CPS need to match whatever engine management system you're running. If you're running Renix, you need the Renix CPS and flywheel. If you've got everything from a '95 in there, you'll need the flywheel and CPS for a '95. The flywheel I used to have was from the 95 and never had any problems with it. Are you saying that I need to swap flywheel or do I need to go to Napa and get a 95 cps? Are you running a Renix ignition/injection system, or the later Chrysler ignition/injection system? Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 12, 2016 Share Posted September 12, 2016 To simplify, if all you did was replace the transmission, you need to use the same flywheel and CPS you had in it originally. If you are replacing the flywheel and/or the CPS, you need to replace them with the same part(s) as the originals, be it Renix or HO. Link to comment Share on other sites More sharing options...
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