Crank position sensor problems (maybe) - Page 3 - JeepForum.com
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post #31 of 38 Old 04-05-2014, 02:40 PM
drs01xj
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2001 XJ Cherokee 
 
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Same problem, cranks but no start

This is starting to drive me crazy! About a week and a half ago I tried to start my truck. It fired and died. New cam position sensor, new crank position sensor, new coil, new ASD relay. NO SPARK! It wont even fire on starting fluid.

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post #32 of 38 Old 04-05-2014, 04:08 PM
cruiser54
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Quote:
Originally Posted by drs01xj View Post
This is starting to drive me crazy! About a week and a half ago I tried to start my truck. It fired and died. New cam position sensor, new crank position sensor, new coil, new ASD relay. NO SPARK! It wont even fire on starting fluid.

Thanks for your post.

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post #33 of 38 Old 04-06-2014, 08:02 AM
drs01xj
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Sorry about that. It's a 2001 Cherokee Sport. 4wd, 4.0 engine, automatic transmission.
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post #34 of 38 Old 08-11-2014, 01:51 PM
skeletonizer
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Will you still get spark if the CPS is causing a no start?

I have a '94 zj 4.0 auto. It appears I have spark, fuel, and compression. It fired but failed to start and now just cranks...

Thanks in advance.
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post #35 of 38 Old 08-25-2016, 09:23 AM
AVjeeper1
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1989 XJ Cherokee 
 
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This is an awesome thread. Thanks for the information so far. I think I am experiencing "Thermal Failure." Same no start symptoms as listed in previous posts. If i disconnect the CPS connector and cycle the key several times and then reconnect the CPS connector it will most often start up again. My connectors look old and worn. Anyone know where I can get CPS pigtails? Does splicing interrupt the current or adversely affect input signals, etc...?

Much obliged,
AVjeeper1
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post #36 of 38 Old 08-25-2016, 10:31 AM
jordan96xj
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If the splicing is done properly, it will not cause any problems. FSM procedure for splicing calls for stripping 1/4-1/2 inch stripping of insulation from each wire end. Heat shrink is slid down one wire. The strands of the wire are then pushed together (as in intermingled, not twisted together, not using twist caps, etc.). The intertwined strands are then soldered. The idea is to have as many strands touching as many other strands as possible. Then the heat shrink is pulled over and applied to protect. I think they recommend at least 1-2 inches of heat shrink on either side of the splice to be sure that moisture won't get in later.

Things I keep around that help fix Jeeps:
AeroKroil and Fluid Film
BAFX Products 34t5 Bluetooth OBDII Scan Tool and Torque Pro OBD2 App for Android
Etekcity MSR-P600 Digital Multimeter
Bernzomatic TS4000 Trigger Start Torch + MAP Gas
1/2 inch sockets, Breaker, Cheater Pipe, and BFH
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post #37 of 38 Old 08-25-2016, 07:00 PM
tax2dth
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I have a 99 jeep Cherokee 4.0. I was driving stopped at Red light engine died and won't start back. I done some research and everything pointed at the crank position sensor so I replaced it still won't start. I am getting fire at the plug, I'm getting fuel, no blown fuses, no engine codes. When I crank it if I hold gas to floor it will back fire through the intake. Before this all happened I did have symptoms of cps going out rough idle sometimes when I started it the fuel gauge would work for few min then start working. So what do I need to test next any help be appreciated.

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post #38 of 38 Old 09-21-2017, 07:32 PM
Zj400k
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Quote:
Originally Posted by tax2dth View Post
I have a 99 jeep Cherokee 4.0. I was driving stopped at Red light engine died and won't start back. I done some research and everything pointed at the crank position sensor so I replaced it still won't start. I am getting fire at the plug, I'm getting fuel, no blown fuses, no engine codes. When I crank it if I hold gas to floor it will back fire through the intake. Before this all happened I did have symptoms of cps going out rough idle sometimes when I started it the fuel gauge would work for few min then start working. So what do I need to test next any help be appreciated.

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If it were mine I would see if it would fire on starting fluid up the intake, the cam and crank sensors both control the fire and fuel injectors timing within the engine and I've never had either one of them throw a code unless a junk after market sensor was used and on those the airgap cannot b set plus they are inferior parts I've got 407,000 on my 96 zj 4.0 and been thru alot of aftermarket parts seeing what's what and lemme tell u dealer parts are far suprior. I realize now that this msg was a yr old but I would have answered sooner to help but didn't become a member til recently, hope u got it squared away tho.
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