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Unread 02-16-2015, 10:52 AM   #1
srwells37
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2001 WJ 
 
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2007 jeep grand cherokee 5.7 hemi stalling issue

I have a 2007 jeep grand Cherokee 5.7 hemi that stalls.
I would start the jeep and let it idle for about 7 minutes and idles it smooth.
After the 7 minutes, the idle goes from 700 rpm to 900 rpm then drops down to 200 then to 700 rpm then it dies.
I try to restart the jeep but it acts like the battery has died. I crank it again and it starts but only if I have the accelerator to the floor. If I let off the gas pedal, it'll die.
What I have done so far,
Replaced spark plugs with champion copper plugs. correct gap
Cleaned throttle body.
Cleaned MAP sensor.
replaced ECT sensor.
Cleaned EGR valve and tube.
I checked for vacuum leaks but couldn't hear or see any
Any ideas on what else to check ?

No check engine light.. No DTC codes.

thanks in advance for your input

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Unread 02-16-2015, 12:20 PM   #2
tom19511
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Plugged up fuel filter in the tank comes to mind.
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Unread 02-16-2015, 12:46 PM   #3
srwells37
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Thanks for responding tom19511. I was thinking of something like that. I'm going to do a fuel pressure test.
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Unread 02-16-2015, 02:31 PM   #4
srwells37
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Did a fuel pressure test. I turned the key to run and the gauge jumped to 58 psi. I had my wife start the jeep while I read the gauge, the psi stayed the same. I did a leak down test and the pressure dropped about 3 psi a second. I had my wife do the test again with me. The second time the jeep was running, the needle on the test gauge went crazy. Jumping back and forth from 25 to 60 really fast. I know that's not a good sign.
How can I determine if its the fuel injectors or something else leaking?
Thanks again.
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Unread 02-16-2015, 03:03 PM   #5
tom19511
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You said no trouble codes. I would think leaking injectors would trigger one. Leading to a too rich type code.
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Unread 02-16-2015, 03:21 PM   #6
srwells37
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Right. No trouble codes. When I first start the jeep, it idles good and the exhaust looks and smells like any other jeep but, after letting it run for about 7 minutes, the smell of the exhaust smells like its running rich and smokes alittle more.
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Unread 02-17-2015, 01:42 PM   #7
srwells37
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I replaced the fuel pump for gits and shiggles and the jeep is still doing the same thing. I checked all the injectors and wiring. All was good.
What would cause the jeep to run good for 7 minutes then start running rich to make the engine stall ?
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Unread 02-17-2015, 09:02 PM   #8
kuker
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Just for gits and shiggles(lol) have you checked codes? Just a thought, otherwise how does it drive if you just take off, or is it limited to idling and dying? If it seems stuffy, drop the exhaust before the CATs and see how it runs
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Unread 02-17-2015, 09:10 PM   #9
kparada4
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Correct me if I am wrong, but don't you need the Mopar OEM black tip spark plugs?
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Unread 02-18-2015, 04:17 PM   #10
srwells37
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I put champion copper in. I never paid attention to what color tip they are.
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Unread 02-19-2015, 10:24 AM   #11
kuker
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X2
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Unread 02-19-2015, 12:14 PM   #12
srwells37
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Kuker, the CEL is not illuminated. I did put a code reader to it and no codes. I'm going to disconnect the exhaust from the manifolds tonight and see what happens.
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Unread 02-21-2015, 06:24 PM   #13
srwells37
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Ok. Wasn't able to disconnect the exhaust from the manifold do to snow and fridged cold temperatures these past few days. Today the temp got above freezing but ground is still slushy. I read that if the battery on the 5.7 hemi wasn't fully charged, it could do weird things to the electrical system and make the motor run like crap. I tested the battery. The volts were 11.45 and cranking was 8.63.
Anybody have any thoughts ?

Thanks
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Unread 02-22-2015, 04:19 PM   #14
srwells37
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I dropped the exhaust and the sound is freakin awesome. Wish I could keep it like that for good. Lol
But unfortunately, dropping the exhaust didn't solve my stalling problem. It ran for about a minute then the rpms went from 700 to 200 back to 700 then stalled. It started back up but stalled soon after.

I did a compression and leak down test. Every cylinder was good.

Any other ideas I can try ?

Thanks
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Unread 02-22-2015, 05:22 PM   #15
tom19511
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Have you cleaned and checked the throttle body? Maybe IAC? Maybe try Seafoam treatments?
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