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Mystery problems
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86828		 Page 1 of 1
Author:  CGman [ Mon Jul 03, 2017 10:24 am ]
Post subject:  Mystery problems
After a long stretch of problem-free driving (that's like 6 months in CRD talk!) the Italian Princess is starting to misbehave again.

I had it do this to me about a year ago, but it's now done it to my wife and my daughter twice in 2 weeks.

The episode unfolds like this: Jeep starts and runs fine, after driving several miles and getting up to normal operating temps (and usually after slowing down and then accelerating again) the Jeep starts losing power and won't accelerate, as you slow down and pull over to the side of the road it starts bucking..put it into neutral or park and it will idle okay, but try to accelerate and it sounds like you have the choke on...turn it off and restart one or two times and it's back to normal...until the next time! :banghead:

I am planning on taking this thing to Colorado and doing some 4X4 driving in a month so I"d like to nail down this issue quickly! Any ideas?? All fluids are normal, slight coolant usage, no smoke on start up, timing belt has about 30K miles on it, only ongoing issue is the tranny fluid runback problem.
Author:  WWDiesel [ Mon Jul 03, 2017 10:29 am ]
Post subject:  Re: Mystery problems
Do you have a lift-pump installed?
If not, have you pumped up the fuel head and checked for air in fuel when this happens? :roll:
Author:  CGman [ Mon Jul 03, 2017 10:35 am ]
Post subject:  Re: Mystery problems
WWDiesel wrote:
Do you have a lift-pump installed?
If not, have you pumped up the fuel head and checked for air in fuel when this happens? :roll:


yes, lift tank pump installed several years ago...planning on changing the fuel filter this week even though it's not that old.
Author:  flash7210 [ Mon Jul 03, 2017 11:30 am ]
Post subject:  Re: Mystery problems
Codes?

It seems like a fuel system problem.
Verify that good fuel supply all the way to the CP3.

If you have good fuel supply, then its something electrical. Possibly a loose connection at the fuel rail pressure sensor.
Author:  GordnadoCRD [ Mon Jul 03, 2017 8:35 pm ]
Post subject:  Re: Mystery problems
CGman wrote:
yes, lift tank pump installed several years ago...planning on changing the fuel filter this week even though it's not that old.

consider air filter as well.
Author:  Ludi Neethling [ Tue Jul 04, 2017 8:20 am ]
Post subject:  Re: Mystery problems
I had similar symptoms. Replacing the Crank Shaft Position sensor fixed it. I see you've already replaced that in the past.
Author:  CGman [ Wed Jul 05, 2017 9:35 am ]
Post subject:  Re: Mystery problems
GordnadoCRD wrote:
CGman wrote:
yes, lift tank pump installed several years ago...planning on changing the fuel filter this week even though it's not that old.

consider air filter as well.


I'll replace the air filter too...and the crankshaft POSensor if the problem continues (I carry a spare) 8)

Changed the fuel filter last night and checked everything from top to bottom, the only suspicious thing I found was that there were two rubber o-rings on the water sensor on the bottom...anyone else have this?
Author:  TKB4 [ Sun Jul 09, 2017 12:09 pm ]
Post subject:  Re: Mystery problems
Make sure and check that the lift pump is running. If you wired as most, should be able to open the fuel filter bleeder and turn key on and fuel should come out in steady stream without pumping up the filter head. You would probably notice this at filter change anyway.
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