TPS or CPS?

89 cherrokee 4.0 automatic getting intermitant starts,occasional dead stops while driving. Idles smooth,drained tank,changed filter,rotor,plugs ect. Fuel pump and coil fine.Cleaned ballast resistor. RUNS GREAT when running. WILL START WITH THE HELP OF EITHER. This leaves the sensors,taking a poll on TPS vrs. CPS. Crankshaft position sensor less expensive but I've been told its a bear to get to. No, my local junkyards won't sell electric parts!! Thanks all.

Tps... :)

I'd get a voltmeter so you can check the TPS output voltage before spending the coin...

mieth,just happened by comput and checked forum,saw your message. THEN I bumbled onto this website,I'm amazed. http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm

What does the CPS look like and where is it located?

What does the CPS look like and where is it located?
heck out the website I quoted above, it will school you... http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm

heck out the website I quoted above, it will school you... http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm

Dude, would also like to know where the CPS is located and how it looks like. The article above was very informative, but it also doesn't show the location as well as how it looks like. Thanks! :)

Dude, would also like to know where the CPS is located and how it looks like. The article above was very informative, but it also doesn't show the location as well as how it looks like. Thanks! :)


Allright you guys, the CPS is a master of hidden misery. It is on the bell housing,(between motor and tranny) on the drivers side and at about 11 o'clock if you are looking from behind. You have to be absolutly under the jeep,legs out by the drivers front wheel,position your head just behind bell housing and do an 'ab crunch' while looking up! Then you will see it. You may even reach up and touch it. But it takes a whole lot of doing to get a wrench on it. You need a wobbely head socket and alot of time and cursing. The guys at the junkyard suggest opening a hole in the floorpan to access it! Try this link http://autorepair.about.com/cs/faqs/l/bl557h.htm

OMG!! Don't cut the floor pan. I changed mine quite easily. I linked several extensions together with a universal (wobbly thingy) and the proper size socket. Came right out.

Before I disconnected the wiring, I tied a string to the TPS side of the connector. When I pulled the old TPS out, I had the string to connect the new TPS to so I could pull the wiring up above the engine.

OMG!! Don't cut the floor pan. I changed mine quite easily. I linked several extensions together with a universal (wobbly thingy) and the proper size socket. Came right out.

Before I disconnected the wiring, I tied a string to the TPS side of the connector. When I pulled the old TPS out, I had the string to connect the new TPS to so I could pull the wiring up above the engine.

Don't panic saud,I wasn't really gonna cut the floor pan. (although a nicely finished,hinged trap door would be ok there) I think in your haste you kept saying tps when you meant cps. This will definatly confuse the meek. HE MEANT CPS!!!

Ya can change it a LOT easier if you'll support the transmission crossmember w/ a floor jack, remove the four bolts holding it in place and SLOWLY lower the transmission crossmember w/ tranny by about 1-2 inches. Be carefull not to bend stuff but dropping it this small amount will give you plenty of room.

Clean your cps connector and use some dielectric grease in it... older XJ's (primarily Renix systems) have a real issue with connector oxidation / corrosion leading to wierd electrical gremlins that often imitate sensor failure.



GeorgeDexter - Thanks for posting the link to my site: www.lunghd.com .

thanks for the link, George. Very informative

rotorfloat and lunghd you're both welcome. Lungy,yours is a FANTASTIC website and I hope more people visit it. G. Dexter

Yikes!! I did mean CPS. Guess I did get too excited and the thought of
a sawzall slicing through the floor. lol.....

Yikes!! I did mean CPS. Guess I did get too excited and the thought of
a sawzall slicing through the floor. lol.....
Hey Saud...I wouldn't think of using a sawzall.....probably use pnuematic tin nippers. I still think a nicely finished trap door would be OK. Perhaps I could adapt a gas filler door or some such thing. Glad we're laughing...

Hey, you're a "high class" kind a guy to use cool pneumatic snips. I saw a guy once use a jig saw and freehand two openings to get to some bolts on the bell housing. He told me he would cover it with carpet so no one would know.

carpet beats duct tape

In esthetics maybe but not water resistance. :)

I'd say using a word like 'esthetics' is much more "high class" than pneumatic snips. Maybe I'll try to get in touch with my "inner hillbilly" and use a tomato soup can. (Edged of course with duct tape.)