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Old August 8th, 2014, 05:05 PM   #1
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Default won't start

So Trish ran her jeep out of gas then let it sit overnight and now it won't start. put 3 gallons from a can in it and nothing...new crank sensor....nothing.....ideas?

sidenote.....replacing a crank sensor sucks ass
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Old August 8th, 2014, 05:12 PM   #2
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Is there fuel at the fuel rail on the engine? Can you hear the fuel pump running?
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Old August 8th, 2014, 05:12 PM   #3
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Sounds like the fuel pump burnt up from running out of gas.
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Old August 8th, 2014, 05:22 PM   #4
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she has fuel at the rail......just checked
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Old August 8th, 2014, 05:28 PM   #5
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Fuel pump kicks on just fine
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Old August 8th, 2014, 05:32 PM   #6
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Got spark ? Maybe it really didn't run out of gas.....
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Old August 8th, 2014, 05:34 PM   #7
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Got spark ? Maybe it really didn't run out of gas.....
that was my thinking.....it's turning over and fuel at the rail and fuel pump is running....

what do I check next?
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Old August 8th, 2014, 06:56 PM   #8
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You need to check fuel pressure also. Pushing the shrader valve and seeing fuel squirt out is not flawless indication of fuel pump condition. Next verify spark. If no spark then suspect crankshaft position sensor or cam position sensor. After that there are a number of small variables that could contribute to a no spark condition that can not be diagnosed over the internet. A way to cheat with the spark test is to spray some starting fluid in the air cleaner while someone cranks the motor. If the engine starts and runs briefly, then suspect a fuel delivery issue.
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Old August 8th, 2014, 08:59 PM   #9
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Not the coil, swapped that out with Franks and still nothing......will begin again tomorrow ......

Thanks for swingin by Frank!
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Old August 9th, 2014, 11:40 AM   #10
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You need to check fuel pressure also. Pushing the shrader valve and seeing fuel squirt out is not flawless indication of fuel pump condition. Next verify spark. If no spark then suspect crankshaft position sensor or cam position sensor. After that there are a number of small variables that could contribute to a no spark condition that can not be diagnosed over the internet. A way to cheat with the spark test is to spray some starting fluid in the air cleaner while someone cranks the motor. If the engine starts and runs briefly, then suspect a fuel delivery issue.
replaced crankshaft sensor yesterday, fuel pump sounds good, sprayed starting fluid and still crank no start. Checked all fuses...all good. stuck a computer on it and read...cannot read pcm...swapped in a different known working pcm...same reading....

test light on wires to pcm next
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Old August 9th, 2014, 01:14 PM   #11
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Check the grounds...the strap on the back of the motor, ground at the coil, and I think there's one around the trans dipstick tube area. I had issues with the one around the trans dipstick on my xj.
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Old August 9th, 2014, 01:36 PM   #12
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Quote:
Originally Posted by jeepbrattt View Post
replaced crankshaft sensor yesterday, fuel pump sounds good, sprayed starting fluid and still crank no start. Checked all fuses...all good. stuck a computer on it and read...cannot read pcm...swapped in a different known working pcm...same reading....

test light on wires to pcm next
Sounds like no spark then. Probably needs a sensor or computer.
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Old August 9th, 2014, 02:48 PM   #13
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Not sure what year your dealing with but tj did this to me once. It was a coil on plug style and the magnet inside the cam sensor fell off. Cheap and easy fix. Just took awhile to find it.
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Old August 9th, 2014, 04:31 PM   #14
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Check the grounds...the strap on the back of the motor, ground at the coil, and I think there's one around the trans dipstick tube area. I had issues with the one around the trans dipstick on my xj.
will do thx

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Sounds like no spark then. Probably needs a sensor or computer.
Not the computer, flipped that to one out of a running XJ and same issue.
Will be looking into sensors...crankshaft sensor replaced already

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Not sure what year your dealing with but tj did this to me once. It was a coil on plug style and the magnet inside the cam sensor fell off. Cheap and easy fix. Just took awhile to find it.
Coil is good, swapped that last night with one out of a running Jeep, no change....cam sensor is on the check list
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Old August 10th, 2014, 01:52 PM   #15
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Quote:
Originally Posted by jeepbrattt View Post
replaced crankshaft sensor yesterday, fuel pump sounds good, sprayed starting fluid and still crank no start. Checked all fuses...all good. stuck a computer on it and read...cannot read pcm...swapped in a different known working pcm...same reading....

test light on wires to pcm next
bet the cig lighter fuse is blown
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Old August 10th, 2014, 01:55 PM   #16
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ok, quit swapping parts, you need to check 2 things right now.

1. what is the fuel pressure?
2. does it have spark?


you keep swapping parts back and forth but the only thing you're checking is if that part is the bad part. right now the only symptom you have is "no start"
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Old August 10th, 2014, 04:18 PM   #17
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Quote:
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ok, quit swapping parts, you need to check 2 things right now.

1. what is the fuel pressure?
2. does it have spark?


you keep swapping parts back and forth but the only thing you're checking is if that part is the bad part. right now the only symptom you have is "no start"
Fuel pressure is good. No spark
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Old August 10th, 2014, 04:30 PM   #18
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Does it have spark plug wires abd a distributor or a long coil pack on the head?
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Old August 10th, 2014, 04:59 PM   #19
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Does it have spark plug wires abd a distributor or a long coil pack on the head?
long coil pack on head.......
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Old August 10th, 2014, 05:41 PM   #20
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Take the cam sensor off the oil pump drive and make sure that there is still a good tone wheel under there. I have seen a few that would fall apart and wreck the cam sensor and pump drive. Also check at the injectors for 12v on the green wire orange strip (I think) while cranking. If there is no power ther many of the other sensors are also lacking voltage.
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