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Old 02-25-2013, 09:54 PM
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Jeep 4.7 miss fires.

I have a wj 4.7. Motor has a little over 30k on it. After a day of some throttle I was driving down the road and it shut off on me, fires it back up to a extremely ruff idle/ miss fire. It needed a radiator thAt had a leak but never ran hot.new radiator in new temp sensor/ sender but still not running right. Drove fine no noises but shut off on me and started back with a mis fire. I'm assuming some sensor, not throwing codes and re set computer a few times. Any suggestions would help. Sent from my phone so sorry about spelling. Thanks for the help
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Old 02-26-2013, 06:18 AM
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Re: Jeep 4.7 miss fires.

Welcome to the garage.
Did you check for any fault code using the key dance ( ignition switch off/on 3 times and leave in on at the third time. Odometer will show DONE when no faults, or any fault code) This looks like a crank or cam sensor problem.
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Old 02-26-2013, 10:22 AM
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Re: Jeep 4.7 miss fires.

Yea. Last time it was cam/crank sensor it would run fine until I heated up then started this guess its worth a shot.
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Old 02-26-2013, 06:54 PM
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Re: Jeep 4.7 miss fires.

Radiator. Temp sensor/sender. Cam sensor. Fuel filter. And new plugs. Only thing left could be crank sensor, coil packs, or a compression check.
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Old 02-26-2013, 09:19 PM
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Compression check time.

Sent from my LG-P999 using Tapatalk 2
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Old 02-26-2013, 10:39 PM
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Re: Jeep 4.7 miss fires.

Quote:
Originally Posted by Ko.berg View Post
Radiator. Temp sensor/sender. Cam sensor. Fuel filter. And new plugs. Only thing left could be crank sensor, coil packs, or a compression check.
There is no fault code set? If not, i would start with the crank sensor.
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Old 02-27-2013, 03:40 PM
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Re: Jeep 4.7 miss fires.

Hasn't thrown any codes tried every sensor and cleaning the throttle body. Drained the oil no shavings so I'm guessin computer/ timing chain or valves
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Old 04-17-2013, 05:59 PM
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Re: Jeep 4.7 miss fires.

Tore it apart . Valve seat came out so the valve stuck. Got the head worked and everything put back together. Which brings me to my next problem. New radiator and cap and it is now running hot. Has no thermostat in it. Before it wouldn't get over 180/190 now will jump well over 210 quickly no water in the oil and all new head gasket . Was spitting water out of the over flow. So I think water pump is good. Any suggestions would be appreciated.
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Old 04-17-2013, 06:16 PM
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Re: Jeep 4.7 miss fires.

Did you remove the bleed.screw close to the upper hose to get most of the air out and coolant in during coolant filling? Did you check for air bubbles in the overflow reservoir? Coolant spitting from the overflow reservoir will not say anything about the.functioning of the waterpump. It can only come out due to thermal expansion, or when air is entering the system. Not sure if its possible, but the serpentine belt is placed in the right position over the waterpump pulley?
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Old 04-17-2013, 06:20 PM
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Re: Jeep 4.7 miss fires.

Yes I have done the bleeding thing a few times there was a milky bubble in the overflow. But with new radiator cap there isn't anymore
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Old 04-17-2013, 06:30 PM
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Re: Jeep 4.7 miss fires.

Milky bubble or bubbles? Just put some extra questions on my previous answer.
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Old 04-17-2013, 06:33 PM
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Re: Jeep 4.7 miss fires.

Just a bunch of small ones.
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