‘99 Jeep Grand Cherokee CPS install

[sobi1998]

I have the 4.7L model. I replaced the camshaft position sensor because it was throwing codes saying it was bad. I replaced it and now it won’t start. Cranks but won’t turn over. Looking for basic suggestions. Clean the connector? Try the old one again? Thanks


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[AZ Refugee]

Try the old one, I have an 04 with the 4.7, had a similar issue, it was a bad sensor from Auto Zone

 

[sobi1998]

Try the old one, I have an 04 with the 4.7, had a similar issue, it was a bad sensor from Auto Zone

It’s a duralast part. I forgot to ask if they had MOPAR
It was autozone too

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[JeepFiend]

In my experience, Jeeps really like Mopar parts. If I couldn't get Mopar, I'd settle for NAPA.

Also, make sure you reset the computer so it relearns the sensor reading. I changed an IAC once and the thing started idling at 3k rpm until I reset the computer.

 

[AZ Refugee]

It’s a duralast part. I forgot to ask if they had MOPAR
It was autozone too

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Not to say Auto Zone is bad, but I have had better luck with OEM, BWD, Standard Ignition, etc. versus Duralast.

 

[sobi1998]

I tried the old sensor and it fired up real quick. Going to go back and get a refund right now


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[AZ Refugee]

I tried the old sensor and it fired up real quick. Going to go back and get a refund right now


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glad it solved it.

 

[sobi1998]

Got a replacement and that didn’t work. Now the old one isn’t working either...
The code is back in the dash too


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[sobi1998]

Update: IT WORKS! I really tightened it down snug and used some contact cleaner and the new part really worked!


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[JeepFiend]

if you have an ohm meter, you should be able to test the sensor and make sure the issue doesn't lie in wiring or connector. Can't seem to find a link for a grand, but if it's like the cps for a cherokee there's a ton of write ups.

 

[jrbfishn]

I have q '97 that did the same thing. It was the plugs on the control module or the module itself. You will probably wind up replacing it. When you do, you will need to fashion some kind of bracket to support the weight of the wire harness. It is a common problem.
Jeep Forum has a lot about it.

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[jrbfishn]

Update: IT WORKS! I really tightened it down snug and used some contact cleaner and the new part really worked!


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Hope it keeps working for you. Lucky you if it does.

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[sobi1998]

I noticed it started when I tightened it snug. If it was loose it wouldn’t


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[sobi1998]

glad it solved it.

Would you have any clue as to why the oil gauge is consistently at 60? I seem to remember in the past it was always at 40 (straight up)


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[JeepFiend]

higher flow oil filter? Stick a Fram filter on it and see if it goes down.

 

[sobi1998]

higher flow oil filter? Stick a Fram filter on it and see if it goes down.

I’ve been getting purolator for some time. Haven’t used Fram in a while. I’ll try that next time. Just changed the oil at New Years


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[JeepFiend]

Well high oil pressure is usually not as worrisome is low. A couple things I can think of that would increase it are higher viscosity and higher flow oil filters. Frams are like a giant sponge instead of a filter. So it used to be a common joke that if you had higher oil pressure, put in a Fram...that'll bring it down. =) What's your oil look like? Is it that pretty golden honey color, black, or kind of milky with bubbles?

 

[sobi1998]

Well high oil pressure is usually not as worrisome is low. A couple things I can think of that would increase it are higher viscosity and higher flow oil filters. Frams are like a giant sponge instead of a filter. So it used to be a common joke that if you had higher oil pressure, put in a Fram...that'll bring it down. =) What's your oil look like? Is it that pretty golden honey color, black, or kind of milky with bubbles?

I checked it this morning and it was starting to turn black. Still noticeably yellow but with a black tint. I change it about every 3 months or 4K-5k miles and it’ll be dark brown. I add Lucas oil leak stop. I think it helps imo


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[JeepFiend]

well, it's hard to say, obviously it could be a lot things....bad guage, bad sending unit, bad bypass valve, clogged oil passages (but with regular oil changes that's less likely). My understanding is that Jeep went back to dummy lights instead of gauges on the newer vehicles for that reason. There's some discussion here: https://www.jeepforum.com/forum/f310/60-psi-oil-pressure-normal-3729321/

 

[sobi1998]

well, it's hard to say, obviously it could be a lot things....bad guage, bad sending unit, bad bypass valve, clogged oil passages (but with regular oil changes that's less likely). My understanding is that Jeep went back to dummy lights instead of gauges on the newer vehicles for that reason. There's some discussion here: https://www.jeepforum.com/forum/f310/60-psi-oil-pressure-normal-3729321/

You talk about lights, my sisters Jeep Liberty ‘06, the oil light came on. No clue what it meant..
Checked the oil and that was fine. She said it’s been about 3 months since she changed the oil. No clue because you can’t see a gauge...


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