98 V8 crank sensor plug original location - JeepForum.com
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post #1 of 28 Old 12-10-2019, 04:00 AM Thread Starter
Zilliver
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98 V8 crank sensor plug original location

Hi guys

Im soon replacing my crank sensor (5.9) - when I removed the old one, the connector plug was hanging around the front O2 sensor location, more in the tranny side.

What is the original location for the crank sensor connector plug?
Somewhere up the tranny?

I would like to get it high as possible.


98 Grand Cherokee 5.9 - daily
95 Grand Cherokee 5.2 - offroad
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post #2 of 28 Old 12-10-2019, 05:42 AM
Timo_90xj
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It's behind the distributor and oil pressure sender, on top of engine block/ transmission bellhousing.
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

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1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #3 of 28 Old 12-10-2019, 06:00 AM Thread Starter
Zilliver
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Thank you Timo, so the wire harness is not in the original place for me.

It was there for my 95 5.2, so I was surprised to find it near the O2 sensor.

98 Grand Cherokee 5.9 - daily
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post #4 of 28 Old 12-10-2019, 06:05 AM
wingless
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This image shows that the transmission doesn't have cable / connector mounts near the CPS, only at the transmission / overdrive joint, red in the image.

Another image shows the same for the rear of the engine.

None of my chassis images show a connector mounting location.








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post #5 of 28 Old 12-10-2019, 07:19 AM
Timo_90xj
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Quote:
Originally Posted by Zilliver View Post
Thank you Timo, so the wire harness is not in the original place for me.
It was there for my 95 5.2, so I was surprised to find it near the O2 sensor.
Dunno if the earlier models had a different design on the wire harness, but on the '96-'98 5.2 and 5.9 crankshaft- & camshaft position sensor- and oil pressure sender connectors are all located near/ behind the distributor.


Quote:
Originally Posted by wingless View Post
This image shows that the transmission doesn't have cable / connector mounts near the CPS, only at the transmission / overdrive joint, red in the image.

Another image shows the same for the rear of the engine.

None of my chassis images show a connector mounting location.
Correct, there are no connector or cable mounts for the CPS, nor are there any for the camshaft position sensor or oil pressure sender.
From the 1998 FSM wiring diagrams- section; bottom right picture:




1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #6 of 28 Old 12-10-2019, 09:08 AM
Mitogt
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i just replaced my crank position sensor on my 98 5.2, the connector was near the O2 sensor, did not have much space to put hands on connector to plug them together but did it finally get tigt together, seems like it was there from factory
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post #7 of 28 Old 12-10-2019, 09:27 AM
jrcromwell
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Quote:
Originally Posted by Timo_90xj View Post
Dunno if the earlier models had a different design on the wire harness, but on the '96-'98 5.2 and 5.9 crankshaft- & camshaft position sensor- and oil pressure sender connectors are all located near/ behind the distributor.




Correct, there are no connector or cable mounts for the CPS, nor are there any for the camshaft position sensor or oil pressure sender.
From the 1998 FSM wiring diagrams- section; bottom right picture:



That image from the FSM is a fantasy...I have replaced the CPK on 5.2 and 5.9's. The harness connector is crammed between the body and transmission in the area of the upstream 02 sensor. There is absolutely no slack in that harness.

A great aftermarket part could have been a connector extender to move the plug to a reachable location near the CPK. (another fantasy).
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post #8 of 28 Old 12-10-2019, 09:37 AM
Timo_90xj
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My crankshaft position sensor connector is in the area where that picture shows it should be. It sure is a tight spot to reach, but it is nowhere near the upstream O2- sensor connector on my Jeep.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #9 of 28 Old 12-10-2019, 09:43 AM
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When I access my CPS, I first remove the exhaust wye pipe, then lower the transfer case / transmission, providing acceptable blind reach one-arm access.

My CPS connector is also not near the O2 sensor.

Curse words are optional, but not required...


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post #10 of 28 Old 12-10-2019, 11:47 PM Thread Starter
Zilliver
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I used 1/4 ratchet, 3 long extensions, swivel adapter and 13mm socket. Ratchet between the A/C lines. Tool on the right hand and left hand supporting from the passenger side of the collector.
It takes me like 15-20 minutes to get it out

Thank you all for the info, I will try to get the connector as high as possible when I have the new Mopar sensor on hand.

98 Grand Cherokee 5.9 - daily
95 Grand Cherokee 5.2 - offroad
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post #11 of 28 Old 12-11-2019, 11:02 AM
jrcromwell
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I know that manufactures change things during production runs all the time. Perhaps this is the case with the CKP plug location.

This is the pic from my 98 5.9 the 5.2's I have done from 97 and 98 have been in the same place.

When I rebuilt my transmission and resealed the engine I looked at moving that plug location.

All I can say is that there must have been differences during manufacturing.
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post #12 of 28 Old 12-12-2019, 12:22 AM Thread Starter
Zilliver
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jrcromwell - good picture, I have it in the same location - but I dont like it, its too low for being such an important part of the car.

I will try to locate it higher if possible

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post #13 of 28 Old 12-21-2019, 02:04 PM Thread Starter
Zilliver
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Replace is done.







13mm socket or 6mm hex for the bolt. Have seen a lot of different info in the web
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post #14 of 28 Old 02-28-2020, 12:02 PM
tjx0116
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Quote:
Originally Posted by Zilliver View Post
Replace is done.







13mm socket or 6mm hex for the bolt. Have seen a lot of different info in the web
Were you able to replace the CPS from the engine bay or underneath? Do you have any shots of the CPS attached? I'm having a hard time finding it. Thanks!
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post #15 of 28 Old 02-28-2020, 12:18 PM
Timo_90xj
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Quote:
Originally Posted by tjx0116 View Post
Were you able to replace the CPS from the engine bay or underneath? Do you have any shots of the CPS attached? I'm having a hard time finding it. Thanks!

Looking from behind the engine, it sits at around 1 or 2 o' clock. Two bolts on the top, they are either 1/2" or 13mm. Unfortunately I don't have a picture of the exact location, but it's the only sensor in that area.
I can do it from above or below with my modified exhaust, but IIRC with the stock setup it's a pretty damn tight fit either way.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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