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Unread 10-11-2009, 01:16 PM   #1
broncofire75
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1998 XJ Cherokee 
 
Join Date: Aug 2007
Location: Toonnerville, GA
Posts: 2,062
Dead Jeep even after replaced CPS and pick up sensor

Hey guys I swapped the CPS yesterday after my Jeep won't start
even with a new camshaft / pickup sensor and ended up putting the old pick up sensor back on and it cranked and ran fine. Drove it about 20 miles and now it's dead again. It started studdering on my way to a buddys house last
night and I made it but now it won't start.

CEL came on right before the studdering started back.

Any help? Any ideas?

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-1998 XJ Sport 4.0L-
-6.5" RE/Rustys/RC lift, Custom Y-link LAs, custom shackle relocation boxes, Pro Comp/RE monos-
-315/75/16 Toyo MTs on Moabs-
-Shaved 8.25 w/HD shafts/Auburn LS/4:10s, HP30 w/ Lock-right, sliders, HD track bar bracket, AA SYE, AppA TC skid, AFE intake, Magnaflow exhaust, Bored TB-
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Unread 10-11-2009, 02:20 PM   #2
broncofire75
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Location: Toonnerville, GA
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Oh and I went and had the diagnostics clecked and it
came back as the pick-up sensor. It didn't work so I tried the CPS.

Anybody had the same problem?
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-1998 XJ Sport 4.0L-
-6.5" RE/Rustys/RC lift, Custom Y-link LAs, custom shackle relocation boxes, Pro Comp/RE monos-
-315/75/16 Toyo MTs on Moabs-
-Shaved 8.25 w/HD shafts/Auburn LS/4:10s, HP30 w/ Lock-right, sliders, HD track bar bracket, AA SYE, AppA TC skid, AFE intake, Magnaflow exhaust, Bored TB-
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Unread 10-11-2009, 02:35 PM   #3
xjfever
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1995 XJ Cherokee 
 
Join Date: Feb 2008
Location: north Ga.
Posts: 14,211
Could it be possible that the replacement cam sensor you got was bad? I have gotten a few bad sensors before.
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Unread 10-11-2009, 04:07 PM   #4
broncofire75
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Well the one I put in it to replace the stock one had a little different plug but it fit. It wouldn't start after I replaced so I changed the CPS. It did great. Now it's broke down again.

I'm gonna go get another cam sensor tomorrow and see if that's it. Idk
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-1998 XJ Sport 4.0L-
-6.5" RE/Rustys/RC lift, Custom Y-link LAs, custom shackle relocation boxes, Pro Comp/RE monos-
-315/75/16 Toyo MTs on Moabs-
-Shaved 8.25 w/HD shafts/Auburn LS/4:10s, HP30 w/ Lock-right, sliders, HD track bar bracket, AA SYE, AppA TC skid, AFE intake, Magnaflow exhaust, Bored TB-
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Unread 10-13-2009, 05:03 PM   #5
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
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Be sure that the "connectors" for both the cam and crank sensors are clean. If there is debris in the connectors, it creates a resistance path which can inhibit the signal from making it to the computer. A can of electrical contact cleaner is the ticket here....

Remember that there is also a connector for the crank sensor inside the engine bay near the firewall #6 injector. Unplug, clean, reassemble.
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Unread 10-13-2009, 06:25 PM   #6
malibill
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possiable fix..

Quote:
Originally Posted by broncofire75 View Post
Hey guys I swapped the CPS yesterday after my Jeep won't start
even with a new camshaft / pickup sensor and ended up putting the old pick up sensor back on and it cranked and ran fine. Drove it about 20 miles and now it's dead again. It started studdering on my way to a buddys house last
night and I made it but now it won't start.

CEL came on right before the studdering started back.

Any help? Any ideas?
Hi, Bill here just went through the same thing replaced everything throttle body, crank sensor, fuel injectors, dist, coil ,fuel pump everything .. still crank but no start fuel at rail and spark at plugs.. drove me crazy try takeing out the front 02 sensor and see if it starts my cat was completly clogged solid .. Installed a new cat and front 02 sensor run`s like new.. hopefully this is what youre problem is..
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