ftpiercecracker1 Posted October 31, 2016 Share Posted October 31, 2016 Pretty sure my problem lies with the title of this thread, but I always like a second opinion to confirm my thinking. About two weeks ago my truck started to die at complete random. Total light switch effect, one second it's running the next it's dead as a door knob. Tach goes to zero and stays there even if the engine is rotating; it's a 5spd so i try to roll start it as I am coasting. On a side note, it never would start that way. It would only fire back up if I cycled and USED the key. Otherwise the truck ran flawlessly. It got worse everyday until driving home the third day after it started it cut out and wouldn't start at all. Classic failing >>>> failed CPS right? Dealership says the part is unobtainable/discontinued. So, with great trepidation, I pick one up from autozone. Right off the bat there are problems. The truck has been stalling/cutting out/hesitating under acceleration/quietly backfiring since the moment I installed the Autozone CPS. Yes, I did Cruiser's CPS mod, just like I did with the last one. Can a poor quality CPS make a truck run crappy or are their symptoms more narrow. I.E. light switch effect. Where can I get a mopar/NOS CPS? Part number? thanks FPC Link to comment Share on other sites More sharing options...
Tex06 Posted October 31, 2016 Share Posted October 31, 2016 Try napa. Their CPS worked better for me. Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
mikekaz1 Posted October 31, 2016 Share Posted October 31, 2016 ive had good luck with napa sensors personally Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2016 Share Posted October 31, 2016 Where can I get a mopar/NOS CPS? Part number? 33004761. Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted October 31, 2016 Author Share Posted October 31, 2016 Called and ordered, should be here tomorrow morning. Edellman brand, never heard of it, but fella at the counter spoke very highly of them. Said it was the best they offered. $40 I guess I was so set on getting mopar I didn't even consider Napa. Will update in 48hrs Link to comment Share on other sites More sharing options...
SVPete Posted November 1, 2016 Share Posted November 1, 2016 I put a CPS I got from Autozone in my truck 9-ish years ago. I don't have any problems with it. My problems were other things....which were troubleshot by the dealer as a bad CPS. I'm interested on how the different CPS works out for you. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted November 1, 2016 Share Posted November 1, 2016 Regular CPS: http://www.morris4x4center.com/crankshaft-position-sensor-33004761.html https://www.amazon.com/Chrysler-MAGNETIC-SPEED-SENSOR-33004761/dp/B008XQNGS6 <== This is the one I have. Looked 100% identical to the factory one that I took off my XJ. High altitude CPS: https://www.amazon.com/Mopar-56027280-Crankshaft-Position-Sensor/dp/B006EFUET2 Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 1, 2016 Share Posted November 1, 2016 ^^ Exactly. Anything else is a crapshoot. Including NAPA. But it would be nice if the HO CPS's were that reasonable. :( Link to comment Share on other sites More sharing options...
Minuit Posted November 1, 2016 Share Posted November 1, 2016 I think you could've stopped at the word "Autozone" personally :D I had one from there die on me at about 350 miles - it failed on Christmas eve in fact. If you don't want to get stuck on the side of the road, Ma Mopar is what you want. Link to comment Share on other sites More sharing options...
Tex06 Posted November 1, 2016 Share Posted November 1, 2016 Can Renix TPSs be tested like an HO? If so, I'd recommend you get 2 paperclips and do that ASAP. Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 1, 2016 Share Posted November 1, 2016 Can Renix TPSs be tested like an HO? If so, I'd recommend you get 2 paperclips and do that ASAP. Huh? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted November 1, 2016 Share Posted November 1, 2016 Can Renix TPSs be tested like an HO? If so, I'd recommend you get 2 paperclips and do that ASAP. Huh? I second that... Huh?? Link to comment Share on other sites More sharing options...
Tex06 Posted November 1, 2016 Share Posted November 1, 2016 CPS, TPS....the alphabet all looks the same late at night. Whoops. Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
cruiser54 Posted November 1, 2016 Share Posted November 1, 2016 Yep. Like this: http://cruiser54.com/?p=50 Link to comment Share on other sites More sharing options...
Tex06 Posted November 1, 2016 Share Posted November 1, 2016 Borrowed from another jeep site, Cruiser's test is outlined for Renix CPSs as the second test. TESTING PROCEDURE 1991 – 2001 4.0L H.O. engines 1. Near the rear of intake manifold, disconnect sensor pigtail harness connector from main wiring harness. 2. Place an ohmmeter across terminals B and C (SEE Image). Ohmmeter should be set to 1K-to-1OK scale for this test. 3. The meter reading should be open (infinite resistance). Replace sensor if a low resistance is indicated. TESTING PROCECURE for 1987 – 1990 4.0 L engines Test # 1 - Get a volt/ohm meter and set it to read 0 - 500 ohms. Unplug the CPS and measure across the CPS connector's A & B leads. Your meter should show a CPS resistance of between 125 - 275 ohms. If the CPS is out of that range by much, replace it. Test # 2 - You will need a helper for this one. Set the volt/ohm meter to read 0 - 5 AC volts or the closest AC Volts scale your meter has to this range. Measure across the CPS leads for voltage generated as your helper cranks the engine. (The engine can't fire up without the CPS connected but watch for moving parts just the same!) The meter should show .5 - .8 VAC when cranking. (That's between 1/2 and ~1 volt AC.) If it's below .5 VAC, replace it. Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 1, 2016 Share Posted November 1, 2016 The FSM "test" for the HO CPS is simply to check for an open across the pins. Every good and bad CPS I've ever checked had an open. Has anyone seen an ohms reading of anything else? At least with the Renix CPS you can test the output to semi-validate it; not so for the HO CPS. Link to comment Share on other sites More sharing options...
Broke Posted November 1, 2016 Share Posted November 1, 2016 Week after I bought my truck the CPS went out, got one from Advance, zero problems. Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted November 2, 2016 Author Share Posted November 2, 2016 Update: Napa part is 99% identical to the Autozone part down to the number printed on the part itself. There was one string of numbers that did not match, I assume batch number? Other than that and a slightly different box, it was the same d**n thing only $15 more. Got it installed, truck fired up fine, took a very short drive around the neighborhood, all seems well. I should point out that I did not modify this part at all. Out of box, onto truck. Maybe I screwed up the AZ sensor when I was doing Cruiser's mods? I've done it before without problems, but I'm not ruling out operator error. I need my truck for work tomorrow, so we shall see. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 2, 2016 Share Posted November 2, 2016 Update: Napa part is 99% identical to the Autozone part down to the number printed on the part itself. There was one string of numbers that did not match, I assume batch number? Other than that and a slightly different box, it was the same d**n thing only $15 more. Got it installed, truck fired up fine, took a very short drive around the neighborhood, all seems well. I should point out that I did not modify this part at all. Out of box, onto truck. Maybe I screwed up the AZ sensor when I was doing Cruiser's mods? I've done it before without problems, but I'm not ruling out operator error. I need my truck for work tomorrow, so we shall see. Which mod did you do? Drill the hole out? Link to comment Share on other sites More sharing options...
Minuit Posted November 2, 2016 Share Posted November 2, 2016 I suppose this is the place to ask now that you've fixed it: does the "high altitude mod" make enough difference to be worth it? Link to comment Share on other sites More sharing options...
cody4359 Posted November 2, 2016 Share Posted November 2, 2016 If it keeps acting up, look into your camshaft position sensor, test your ignition coilpack, and replace cap and rotor. That's what I had to do to mine after replacing crank position sensor Sent from my SM-G900V using Tapatalk Link to comment Share on other sites More sharing options...
cruiser54 Posted November 2, 2016 Share Posted November 2, 2016 Geez cody. Renix has no cam sensor or coil pack. Link to comment Share on other sites More sharing options...
cody4359 Posted November 2, 2016 Share Posted November 2, 2016 Your half right smarty pants, didnt realize it was a renix, just had my issues last week so was trying to help. It does have the ignition coil pack tho maybe the term is ignion coil. You going g to jump on onlyinajeep for putting up a high altitude cps link that's a brake line? Sent from my SM-G900V using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 2, 2016 Share Posted November 2, 2016 Your half right smarty pants, didnt realize it was a renix, just had my issues last week so was trying to help. It does have the ignition coil pack tho maybe the term is ignion coil. You going g to jump on onlyinajeep for putting up a high altitude cps link that's a brake line? Sent from my SM-G900V using Tapatalk Huh? Link to comment Share on other sites More sharing options...
cody4359 Posted November 2, 2016 Share Posted November 2, 2016 You got an actual question or is Huh? Just a habbit? Sent from my SM-G900V using Tapatalk Link to comment Share on other sites More sharing options...
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