Crank Position Sensor Write Up - Page 2

cj7guy · 11-19-2005, 08:23 AM

Anybody have a good write-up on advancing timing, or even know of a company that makes aftermarket CPS units that are already set to advance timing?

BigJpXJ · 05-13-2006, 05:07 PM

Great right up, for me. It was a 7/16 socket that fit the bolts for me. I have a 98 cherokee though.
And man, i wish i heeded to the advice to wait till the car is cooled off just a tad...it was kinda like when u bite into hot pizza and u dont know what to do with the burning piece in your mouth, except the burning is on your arm and u cant figure out how to get it out of that tiny space FAST!

borkap · 05-15-2006, 09:31 AM

Mine is sitting in the parking lot at work dead. I have a 97 4.0 with a manual transmission. Would that be in the same place? I just had mine replaced about a year ago.

Thanks in Advance.

TPI Monte SS · 05-15-2006, 11:18 AM

Great writeup! I'm tempted to buy one now for my '01, as it has been experiencing some loooooooong startup times in the AM. I have to crank it like 15-20 seconds sometimes before it fires up.

redyouch · 05-15-2006, 02:39 PM

to advance the timing you can just make the holes larger to move the CKS over a little. just not sure which way...

**balloo93** · 05-15-2006, 02:42 PM

Quote:

Originally Posted by cj7guy

Anybody have a good write-up on advancing timing, or even know of a company that makes aftermarket CPS units that are already set to advance timing?

Pretty sure Hesco makes one. I had read an online article years ago that mentions some advance on a stock "high altitude" version of the CPS. Not sure if this really exists, but might be worth looking into.

artboy · 08-01-2006, 09:51 PM

take the top bolt OFF first and put it back ON last... this way there is no chance it might drop into the hole where the sensor goes into the bellhousing.

89cherokee4ever · 08-20-2006, 12:19 AM

I just swapped in a rebuilt Renix in my 89 XJ... and even before the project I had a really tough time starting the darn thing! 219,000 miles... DUH! of course it would be hard to start! I got my new motor in and it's a little easier to start... but still very difficult! sometimes takes me around 8 secconds of cranking to start. I checked the timing and it's about 10-12 degrees retarded and the Jeep sputters 4 times, every time after I start it... hot or cold. I knew to check the knock sensor first of all... HUGE crack in it! So $54 later I got a new knock sensor... but nothing is different. Timing is still off 10-12 degrees and she still tries to die when first started in the mornings! I was just wondering if my problem(s) could be my... crispy CPS?

Did I mention my gas mileage is terrible... I assume from the timing? est. mpg 13.5 in town... stock everything

BB1 · 08-20-2006, 07:51 AM

Thank's!, Very timely write-up I'm waiting for the new CPS to arrive 8/21. I can't believe that the dealer and every part's store in town did'nt have one in stock?.
I realize mine is a 92'(old) I'm more pissed that Chrysler could'nt keep them standard to cover a variety of year's?.

AZ Jeff · 08-20-2006, 10:34 AM

Quote:

Originally Posted by redyouch

to advance the timing you can just make the holes larger to move the CKS over a little. just not sure which way...

That won't work on the OBD-II engines. They revert to base timing even if you relocate the CPS a few degrees.

That WILL work on OBD-I and Renix engines.

RickyN29 · 02-27-2007, 06:41 PM

Omg, I was so afraid of doing this (well, not afraid, but it looked hard to get to).

From start to finish, first time doing it, it took me 20 min.

I am about to go out and snap a picture of my extension setup which worked like a CHARM.

No string, no extra hands, just extensions, socket and 20 min.

Brb

Gez · 04-05-2007, 05:59 PM

Firstly hi to all, New member here.
I have a 94 Cherokee (4.0) dead in my drive at the moment, I have relayed the symptoms to my local dealer and he say's it's the crank position sensor. Thing is that when I turn the ignition on I no longer hear the fuel pump prime, and there is no fuel pressure in the fuel rail. Does the CPS also control the fuel pump?
Thanks in advance for any replys.

Update- Just run some further tests, I have proper spark but no fuel pressure, fuel pump prob.

87bucket · 04-05-2007, 06:43 PM

i replaced mine last year. i used a spiffy coil extension, that i recently cut the end off of to use as an HD drain snake. if mine fails again, im cutting a hole with a holesaw in the firewall right behind those bolts, then using a rubber floor plug (ala cj) to plug the hole. same plan for my top 2 bellhousing bolts when i do the clutch later this summer.

tvguy1971 · 04-06-2007, 07:22 AM

very nice write up. i changed mine on our 1990 last summer. it was my first time changing one so it did take longer then 20minutes but i took my time. and ya! be carefull not to drop anything in the bellhousing!! using a ujoint adapter (whatever there called) and some long extensions works best. not sure on the size, 11 - 12mm or 7/16 was one of em.

RickyN29 · 04-09-2007, 11:08 PM

Opps! I guess I never got around to posting the pictures. Here was my setup that worked beautifully!

05-13-2006, 05:07 PM	#17
BigJpXJ Registered User Join Date: May 2005 Location: San Diego Posts: 123 Profile Gallery Classifieds My Jeeps	Great right up, for me. It was a 7/16 socket that fit the bolts for me. I have a 98 cherokee though. And man, i wish i heeded to the advice to wait till the car is cooled off just a tad...it was kinda like when u bite into hot pizza and u dont know what to do with the burning piece in your mouth, except the burning is on your arm and u cant figure out how to get it out of that tiny space FAST! __________________ [U]98 xj classic San Diego, CA[/U] RE 5.5 LA AA HD SYE 12.5x33 A/T np231

05-15-2006, 02:39 PM	#20
redyouch Registered User Join Date: Apr 2002 Location: New Milford, CT Posts: 329 Profile Gallery Classifieds My Jeeps	to advance the timing you can just make the holes larger to move the CKS over a little. just not sure which way... __________________ [SIZE=2][b]90 Cherokee Laredo[/b] destroyed [b]93 Cherokee Sport[/b] destroyed [b]88 Cherokee LTD[/b] junked [b]98 Cherokee Classic[/b] totaled [b]95 Cherokee Sport[/b] flipped [b]87 Wrangler[/b] sold for a profit... :)[/SIZE]

08-01-2006, 09:51 PM	#22
artboy Registered User Join Date: Mar 2005 Location: Buffalo, NY Posts: 802 Profile Gallery Classifieds My Jeeps	take the top bolt OFF first and put it back ON last... this way there is no chance it might drop into the hole where the sensor goes into the bellhousing. __________________ 1993 XJ Sport RIP (Parts) - 189k, white, 4.0, automatic, command-trac NP231 1996 XJ Sport Daily Driver - 95k, stone white, 4.0, automatic, selec-trac NP242, Tow Hooks, SRB fog lights, tinted glass. 2005 Wrangler Rubicon Summer Toy - 8k, 100% STOCK...silver, automatic, soft and hard tops and doors My Pics "life moves pretty fast... if you don't stop and look around once and awhile, you could miss it"...F. Bueller

02-27-2007, 06:41 PM	#26
RickyN29 Registered User Join Date: Apr 2004 Location: San Jose, CA Posts: 1,487 Profile Gallery Classifieds My Jeeps	Omg, I was so afraid of doing this (well, not afraid, but it looked hard to get to). From start to finish, first time doing it, it took me 20 min. I am about to go out and snap a picture of my extension setup which worked like a CHARM. No string, no extra hands, just extensions, socket and 20 min. Brb __________________ 1990 XJ Laredo 4x4 Auto Rusty's ~6" Lift Dana30/Dana44 3.55's Pacer Wheels/High-Tec Retreads 31" MT KargoMaster Safari Rack CSF Open Cooling System Conversion Hayden Tranny Cooler Flowmaster 40 Delta & High-Flo Cat PORC SYE / FRT DS Combo *The Doors are off again for summer!

04-05-2007, 05:59 PM	#27
Gez Registered User Join Date: Apr 2007 Location: Australia Posts: 1 Profile Gallery Classifieds My Jeeps	Firstly hi to all, New member here. I have a 94 Cherokee (4.0) dead in my drive at the moment, I have relayed the symptoms to my local dealer and he say's it's the crank position sensor. Thing is that when I turn the ignition on I no longer hear the fuel pump prime, and there is no fuel pressure in the fuel rail. Does the CPS also control the fuel pump? Thanks in advance for any replys. Update- Just run some further tests, I have proper spark but no fuel pressure, fuel pump prob. Last edited by Gez; 04-05-2007 at 07:25 PM..

05-15-2006, 09:31 AM	#18
borkap Registered User Join Date: Oct 2005 Posts: 1 Profile Gallery Classifieds My Jeeps	Mine is sitting in the parking lot at work dead. I have a 97 4.0 with a manual transmission. Would that be in the same place? I just had mine replaced about a year ago. Thanks in Advance.

08-20-2006, 07:51 AM	#24
BB1 Registered User Join Date: Aug 2006 Location: MN Posts: 17 Profile Gallery Classifieds My Jeeps	Thank's!, Very timely write-up I'm waiting for the new CPS to arrive 8/21. I can't believe that the dealer and every part's store in town did'nt have one in stock?. I realize mine is a 92'(old) I'm more pissed that Chrysler could'nt keep them standard to cover a variety of year's?.

04-05-2007, 06:43 PM	#28
87bucket Registered User Join Date: Jan 2006 Location: Englewood, TN Posts: 93 Profile Gallery Classifieds My Jeeps	i replaced mine last year. i used a spiffy coil extension, that i recently cut the end off of to use as an HD drain snake. if mine fails again, im cutting a hole with a holesaw in the firewall right behind those bolts, then using a rubber floor plug (ala cj) to plug the hole. same plan for my top 2 bellhousing bolts when i do the clutch later this summer. __________________ 94 4-door, 4.0, AX-15, NP231, Chryco 8 1/4, 2" BB, 30x9.5 Kumho MT's

04-06-2007, 07:22 AM	#29
tvguy1971 Registered User Join Date: Apr 2006 Posts: 27 Profile Gallery Classifieds My Jeeps	very nice write up. i changed mine on our 1990 last summer. it was my first time changing one so it did take longer then 20minutes but i took my time. and ya! be carefull not to drop anything in the bellhousing!! using a ujoint adapter (whatever there called) and some long extensions works best. not sure on the size, 11 - 12mm or 7/16 was one of em.

04-09-2007, 11:08 PM	#30
RickyN29 Registered User Join Date: Apr 2004 Location: San Jose, CA Posts: 1,487 Profile Gallery Classifieds My Jeeps	Opps! I guess I never got around to posting the pictures. Here was my setup that worked beautifully! __________________ 1990 XJ Laredo 4x4 Auto Rusty's ~6" Lift Dana30/Dana44 3.55's Pacer Wheels/High-Tec Retreads 31" MT KargoMaster Safari Rack CSF Open Cooling System Conversion Hayden Tranny Cooler Flowmaster 40 Delta & High-Flo Cat PORC SYE / FRT DS Combo *The Doors are off again for summer!