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5.7L Hemi stumbles at idle????
#597877
01/29/10 11:22 PM
01/29/10 11:22 PM
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Joined: Jul 2009
Posts: 102 Virginia
MACDiesel
OP
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OP
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Joined: Jul 2009
Posts: 102
Virginia
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I have a '07 Grand Cherokee with a stock Hemi. Sometimes at idle the RPM's will stumble and almost shut off. I just swapped the air filter to a K&N and pulled a couple of spark plugs to check them out. They look healthy. What could be the issue? If this was the Belvedere there wouldn't be any question. But then the Belvedere doesn't have variable valve timing, multiple displacement, mpfi and all that other stuff.
-1967 Belvedere II 440/4speed
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Re: 5.7L Hemi stumbles at idle????
[Re: MACDiesel]
#597882
01/31/10 11:09 AM
01/31/10 11:09 AM
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Joined: Jan 2003
Posts: 1,443
70duster340
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,443
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Good luck! It seems to have solved that exact same issue with my Dakota. I used some throttle body cleaner, and was quite liberal with it inside the throttle body, as well as all over the iac valve itself. The engine didn't want to run at first, I'm assuming due to the amount of cleaner that I used. But it did finally start, and has (so far) been clear of the stumbling at idle. Keep us posted!
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Re: 5.7L Hemi stumbles at idle????
[Re: 70duster340]
#597884
02/02/10 09:01 PM
02/02/10 09:01 PM
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Joined: Jul 2009
Posts: 102 Virginia
MACDiesel
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OP
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Joined: Jul 2009
Posts: 102
Virginia
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Worked like a charm. Though I forgot to hook the MAF sensor back up and got a check engine light... All is well now. It idles happy.
GREAT ADVISE!
-1967 Belvedere II 440/4speed
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Re: 5.7L Hemi stumbles at idle????
[Re: 70duster340]
#597885
02/02/10 09:03 PM
02/02/10 09:03 PM
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Joined: May 2005
Posts: 1,130 Dayton, Ohio
wldtm
super stock
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super stock
Joined: May 2005
Posts: 1,130
Dayton, Ohio
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There is no IAC on a hemi. Could need a computer flashed, but dealer will know that by VIN.
I would be very surprised if that much carbon/deposits have built up on the throttle blade needing it cleaned. Its worth a shot though.
Justin
Interested in having you car wired? Drag car, street car, EFI swap?
PM for details
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Re: 5.7L Hemi stumbles at idle????
[Re: wldtm]
#597886
02/03/10 02:10 AM
02/03/10 02:10 AM
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Joined: Jul 2009
Posts: 102 Virginia
MACDiesel
OP
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OP
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Joined: Jul 2009
Posts: 102
Virginia
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The check ENG light went out as soon as I reconected the MAF.
As for deposits on the throttle body, it looked like it had 75,000 miles not 25,000. It was thick! Now its all clean and the Hemi is Happy.
-1967 Belvedere II 440/4speed
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