rocketwheels Posted December 29, 2015 Share Posted December 29, 2015 Hey guys, haven't been too active lately, but gotta ask a question........Sgt Rock has had an ignition miss since I drug it out of the chicken shed several years ago. Have never been able to nail it down. Over time (and sometimes twice) I have replaced everything in the ignition system along with everything in the fuel system (including TPS and CPS ) and still this infernal miss is there.....all of a sudden got much worse. Occasional stutter, thuds and occasional pops thru exhaust....all happening when trying to hold constant speeds between 45 and 70. Purrs like a kitten at idle and until just now runs like a whipped dog at full throttle. The question is about the distributor and the CPS which is apparently inside of it. Are these prone to slow failure or what? What is the best solution....1 rebuild the dizzy with the new cps.....2 replace with new/reman stock unit....3 replace with the GM HEI style replacement ? Any insight would be helpful. Thanks guys !! Link to comment Share on other sites More sharing options...
Eagle Posted December 29, 2015 Share Posted December 29, 2015 Are you asking about the crankshaft position sensor (which is what "CPS" usually indicates, or the camshaft position sensor (which is the one that's inside the distributor)? Link to comment Share on other sites More sharing options...
cruiser54 Posted December 29, 2015 Share Posted December 29, 2015 Are you asking about the crankshaft position sensor (which is what "CPS" usually indicates, or the camshaft position sensor (which is the one that's inside the distributor)? And on a Renix, it's not really a cam position sensor. It's a sync generator for the fuel injectors. Year of the truck? I would click on the link in my signature and do Tips 1 through 5 if an 87 or 88 and all but Tip 2 if it's 89 to 90. Link to comment Share on other sites More sharing options...
rocketwheels Posted December 29, 2015 Author Share Posted December 29, 2015 my bad.....I meant Camshaft sensor or whatever it is called inside the dizzy. This is an '88 model. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 29, 2015 Share Posted December 29, 2015 my bad.....I meant Camshaft sensor or whatever it is called inside the dizzy. This is an '88 model. Unplug the little plug at the dizzy and see what happens. Link to comment Share on other sites More sharing options...
rocketwheels Posted December 30, 2015 Author Share Posted December 30, 2015 cruiser54......just unplugged and test drove, no difference, exact same actions ....PS, I followed most of the "cleaning the connections and grounds" tips ,I think I'm good there. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 30, 2015 Share Posted December 30, 2015 cruiser54......just unplugged and test drove, no difference, exact same actions ....PS, I followed most of the "cleaning the connections and grounds" tips ,I think I'm good there. I'm not surprised. "Most"? Why not all? Link to comment Share on other sites More sharing options...
rocketwheels Posted December 30, 2015 Author Share Posted December 30, 2015 ...all of the first ones except tip #2, haven't devoted enough time for that yet. anyways, if there was no change by unplugging the dizzy, then that means the items in the dizzy is.....A - not working at all.....OR.......B - not getting current or signal when it is plugged in ? Link to comment Share on other sites More sharing options...
rocketwheels Posted January 3, 2016 Author Share Posted January 3, 2016 update....had more time to work with it this weekend, seems the entire dizzy is worn out....the lock down ears/ring is cracked and even when secured the whole dizzy is sloppy side to side and up and down in the bore. Guess I'll go buy a new one that has a new sync sensor in it.....p.s. where is the timing mark on the crank harmonic balancer?....on the face/lip of the outer ring, or under the belt on the grooves, or even behind that? Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 3, 2016 Share Posted January 3, 2016 Link to comment Share on other sites More sharing options...
rocketwheels Posted January 8, 2016 Author Share Posted January 8, 2016 thanks hornbrod ! Link to comment Share on other sites More sharing options...
cruiser54 Posted January 10, 2016 Share Posted January 10, 2016 See tips 12 and 13 to get this done correctly. And, Tip 2 is not one to ignore. Link to comment Share on other sites More sharing options...
rocketwheels Posted January 16, 2016 Author Share Posted January 16, 2016 ....alright !! Good to go. saved up and bought a new dizzy, complete with cap and Sync sensor inside. old Sgt. Rock purrs like a kitten. Amazing to have to chase this problem all this time. I bought this truck many years ago and this "misfire" began shortly after starting to drive it.....progressively got worse over time. Threw parts at it one at a time, figures it was the last possible item that could be replaced. The dizzy was just plum worn out, had play in 3 different directions....and I'm not sure if that sync sensor was the problem or just another factor. Anyways, thanks for all the info and insight ! BTW.....my harmonic balancer /pulley does not have any timing marks of any kind (on the rim , the face or anywhere), so I just brought the 1st piston to the top and made marks on the old dizzy so i could duplicate the re-install. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 16, 2016 Share Posted January 16, 2016 BTW.....my harmonic balancer /pulley does not have any timing marks of any kind (on the rim , the face or anywhere), so I just brought the 1st piston to the top and made marks on the old dizzy so i could duplicate the re-install. Odd, I've never seen a harmonic balancer w/o the timing mark. Maybe they don't scribe timing marks on the ones made in China. :peek: Link to comment Share on other sites More sharing options...
rocketwheels Posted January 16, 2016 Author Share Posted January 16, 2016 I kinda thought it was odd , too. Do later engines not have timing marks? It is possible this is not the original , the truck has 237K on it and I have no idea of the history other than purchased new by a chrysler employee, left to sit for 7 years in a chicken shed, and then I got it. It may have a later model engine , I wouldn't know. All of my local jeep friends were very impressed by the power and acceleration this truck has....maybe it has a later motor in it. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 16, 2016 Share Posted January 16, 2016 I had timing marks on the 01 XJ I used to have. Check your engine block casting number. For an 88 it should be 53005535 and it's located on the left side under the front freeze plug. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 17, 2016 Share Posted January 17, 2016 The timing mark on the Dorman HB can be hard to spot. Just a little nick in the rim. Link to comment Share on other sites More sharing options...
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