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Old September 19th, 2013, 02:05 PM   #1
ttrailtj
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help with my 4.0 in xj Started all over

Ran great when i parked it last night, today just cranks and cranks, not even a sputter, fuel rail is full of gas, any ideas? Its a 97

Last edited by ttrailtj; September 24th, 2013 at 09:19 PM.
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Old September 19th, 2013, 02:26 PM   #2
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crank position sensor
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Old September 19th, 2013, 04:50 PM   #3
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What he ^ said +

Do you get a check engine light when you turn the key to the on position?

Is the fuel rail pressurized or just full?
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Old September 19th, 2013, 04:52 PM   #4
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check for spark. x2 on crank sensor. If you get spark, than chances are crank sensor is ok and its something else.
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Old September 19th, 2013, 06:51 PM   #5
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The check engine light came on a few days ago after an oil change , I am not relating the two, or I hope not, I will have my tools tomorrow, its at my GF's house Thanks so far for everyones help
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Old September 21st, 2013, 02:52 PM   #6
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New cps, new cap and rotor , still no fire ???
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Old September 21st, 2013, 02:57 PM   #7
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Cam sensor
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Old September 21st, 2013, 02:58 PM   #8
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We're is it at ?
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Old September 21st, 2013, 03:13 PM   #9
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first off, what year is it?
second off, what codes is it throwing?

if it gets spark, check fuel pressure.

i believe there is only a cam sensor on 00+ XJs
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Old September 21st, 2013, 03:37 PM   #10
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Quote:
Originally Posted by ttrailtj View Post
The check engine light came on a few days ago after an oil change , I am not relating the two, or I hope not, I will have my tools tomorrow, its at my GF's house Thanks so far for everyones help
Turn the key to the on position without starting, you should get a check engine light for about 3 seconds and the fuel pump should run for 2 seconds or so.

If you have no cel/fuel pump/spark your pcm isn't getting power.

If you get a cel and fuel pump runs but no spark its probably ckps/cps issue.


The above applies to obd1, I think the obd2 is setup the same way. I'm sure someone here can confirm.
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Old September 21st, 2013, 03:39 PM   #11
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Quote:
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first off, what year is it?
second off, what codes is it throwing?

if it gets spark, check fuel pressure.

i believe there is only a cam sensor on 00+ XJs
My 91 yj has one under the dizzy, every 4.0lI have touched has been the same way.
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Old September 21st, 2013, 03:39 PM   #12
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Its a 97 i dont have away to check codes guess maybe the coil, hate to keep buying crap if it dont need it put some starter fluid to it also ,nothing , checked all grounds also.

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Old September 21st, 2013, 09:33 PM   #13
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Maybe the pickup coil?
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Old September 21st, 2013, 10:12 PM   #14
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Turn the key on and off 3 times. The engine light will flash the code,count the flashes and let me know I will look them up for you, also check to see if you have power at the coil connector while some one cranks the engine.
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Old September 21st, 2013, 10:14 PM   #15
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did you even check for spark or just start swapping parts? If you haven't yet checked for spark, do that first. just pull a plug wire and get an extra plug or a spark tool. if no spark, check the coil plug. One wire will be 12v+ with key on and the second should be - pulse while cranking. If you get no spark and the end of the spark plug wire but - pulse at the coil plug, chances are your coil is bad. Before swapping coils, check the wire from the coil to the distributer. If the wire is good, than chances are your coil is bad. If you do not get 12v+ at the coil plug, than you have a short somewhere on that wire you need to find.

If you do not get - pulse at the coil plug when cranking, you need a scan tool that can give you a live feed of the crank/cam signal to make sure they are working fine. Basically there is a few things you can do to actually diagnose the problem instead of just throwing parts at it.
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Old September 22nd, 2013, 01:22 PM   #16
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Quote:
Originally Posted by WACKO1 View Post
Turn the key on and off 3 times. The engine light will flash the code,count the flashes and let me know I will look them up for you, also check to see if you have power at the coil connector while some one cranks the engine.
I tried that, the light just stays on , will check power to coil later, ,this is driving me nuts, and its probably something simple.
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Old September 22nd, 2013, 01:33 PM   #17
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Press and hold the odometer reset while turning the key to the on position. This will give you any code that it's throwing.
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Old September 22nd, 2013, 02:44 PM   #18
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Press and hold the odometer reset while turning the key to the on position. This will give you any code that it's throwing.
Did this, and it lit up the shift light and cruse light, this xj dont have either, then the odometer went 9999999,8888888,7777777,down to zeros the just showed the mileage, the all lights went off and check engine lit back up ??
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Old September 22nd, 2013, 02:50 PM   #19
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have any way to check ohms on coil? if you can compare that reading to a spec sheet on the internet. possibly open coil?
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Old September 22nd, 2013, 02:57 PM   #20
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Kind of limited with testing tools , guess a flat bed to a repair shop ?
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