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Car Forum / Jeep / January 2006Is it possible to bypass the CPS (Crankshaft Position Sensor, Crankcase Position Sensor)
I checked for previous topics on this but I did not find one about bypassing the CPS. I am selling my 88 Comanche and wouldn't you know the damned thing will only start cold, one time and thats it. My experience with my 87 tells me its the CPS. I would love to just bypass the thing so I can sell it, or at least so I can tell the guy buying it that this is what the problem is. He is a friend of mine and I am giving him a deal but he is not mechanically inclined so I will end up fixing it for him anyway but I would like to wait for spring when its a little warmer than 10 degrees outside. By the way I am new to the group! My name is Erich I live in the Rockies and I have had a number of Jeeps over the past 25 years. My wife just bought me a 2006 Unlimited so I am learning all about Jeeps again. Thanks! The CPS is how the computer knows how many RPMs the engine is making and when the crank passes TDC (or some other benchmark), and syncs spark and fuel (for FI) to it. With no CPS the computer doesn't know that the engine is turning at all. > I checked for previous topics on this but I did not find one about > bypassing the CPS. I am selling my 88 Comanche and wouldn't you know [quoted text clipped - 12 lines] > > Thanks! Thanks for the input, I figured as much. I had this problem on the road with my 87, it would be great if there was a quick fix so you could get it home and not have to have it towed. Your 87 was carburated and did not have a CPS. Perhaps the 4 bangers had fuel injection in those days, in this case it would have had the CPS. > Thanks for the input, I figured as much. I had this problem on the > road with my 87, it would be great if there was a quick fix so you > could get it home and not have to have it towed. A fellow coworker has an 87 Cherokee with F.I. 6 Banger. > Your 87 was carburated and did not have a CPS. > [quoted text clipped - 4 lines] >> road with my 87, it would be great if there was a quick fix so you >> could get it home and not have to have it towed. > I would love to just > bypass the thing so I can sell it, No problem. You will need a telegraph key, a rubber band, a surplus US Navy URM-43a signal generator, a deer antler and an pineapple. Tie the antler to the torsion dampener with the rubber band and some Elmer's glue. Place the telegraph key where the antler will tap it on each revolution. Wire the telegraph key to the signal generator set for 5500 Hz at 4.2V and then shove the pineapple up your a.s for trying to hide a problem rather than fix it when selling a vehicle.  SignatureStupendous Man, Defender of Freedom, Advocate of Liberty How far? Earle > > I would love to just > > bypass the thing so I can sell it, [quoted text clipped - 7 lines] > at 4.2V and then shove the pineapple up your a.s for trying to hide a > problem rather than fix it when selling a vehicle. LMAO THAT IS TOO FUNNY!!!!!!!!!!!1 > > I would love to just > > bypass the thing so I can sell it, [quoted text clipped - 10 lines] > Stupendous Man, > Defender of Freedom, Advocate of Liberty Is that a 6 pt. antler for a six cylinder? _____________________________________________________________________ 2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco "There is a very fine line between 'hobby' and 'mental illness'." Pronunciation: 'jEp Function: noun Date: 1940 Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase') A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton capacity and four-wheel drive used by the U.S. army in World War II. _____________________________________________________________________ >>I would love to just >>bypass the thing so I can sell it, [quoted text clipped - 7 lines] > at 4.2V and then shove the pineapple up your a.s for trying to hide a > problem rather than fix it when selling a vehicle. ROFLMFAO!! >> I would love to just >> bypass the thing so I can sell it, [quoted text clipped - 7 lines] > at 4.2V and then shove the pineapple up your a.s for trying to hide a > problem rather than fix it when selling a vehicle. You might want to re-read what I wrote, I have every intention of fixing it for him, I am looking for some intelligent discussion on how to isolate or temporarily fix it for him so I don't have to be out working on it in the sub zero weather. > You might want to re-read what I wrote, I have every intention of > fixing it for him, I am looking for some intelligent discussion on how > to isolate or temporarily fix it for him so I don't have to be out > working on it in the sub zero weather. There isn't one. The signal is critical for the engine to operate. My "Rube Goldberg" invention would work if i have the freq and voltage right, but is more work than it takes to do it right. Perhaps I came off a little cold, so this is my disclaimer of sort. I am not a bad guy, I felt really bad that when my friend came to see the truck it would not start after the first try. I told him I had the same problem with my 87 and that I would research it so we could get it running. I would never screw anyone over especially some one I work with. I went out after work and bought the sensor, $35 I still don't want to put it in until things warm up a little. Here is my original text. I wrote: > I checked for previous topics on this but I did not find one about > bypassing the CPS. I am selling my 88 Comanche and wouldn't you know [quoted text clipped - 5 lines] > end up fixing it for him anyway but I would like to wait for spring > when its a little warmer than 10 degrees outside. > By the way I am new to the group! My name is Erich I live in the > Rockies and I have had a number of Jeeps over the past 25 years. My > wife just bought me a 2006 Unlimited so I am learning all about Jeeps > again. > Thanks! Erich, I read that in your post, but it was just too easy a target to resist. It's just that I instantly saw your problem as one that has no "work-around", if the CPS quits, it's dead.. I am a mechanic and see this stuff all the time, at least in your case the guy knows something is wrong. It is usually my sad duty to tell people what they really bought and what the former owner did to it. Sorry if i offended you, it was not my intention. SignatureStupendous Man, Defender of Freedom, Advocate of Liberty . Wow, with friend like you, who would need an enemy? This has got to be some sort of joke. When you think you've heard it all, just log onto the internet! Jim Smith >I checked for previous topics on this but I did not find one about > bypassing the CPS. I am selling my 88 Comanche and wouldn't you know [quoted text clipped - 12 lines] > > Thanks! I have found that in most cases, it is only a dirty connection on the CPS. The plug sits on top of the manifold at the back. WD40 will work to clean it, but the best is a spray contact cleaner for electronics. The other sneaky one that will cause your symptoms bit my 88 after I changed the CPS for nothing when the plug clean didn't work is a bad ground strap from the back of the engine head to the firewall. These go ratty easy and the body can steal some ground, but not enough to be stable. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > I checked for previous topics on this but I did not find one about > bypassing the CPS. I am selling my 88 Comanche and wouldn't you know [quoted text clipped - 12 lines] > > Thanks! You can not bypass the Crank Position Sensor. >I checked for previous topics on this but I did not find one about > bypassing the CPS. I am selling my 88 Comanche and wouldn't you know [quoted text clipped - 12 lines] > > Thanks! |
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