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Unread 11-07-2015, 01:23 PM   #1
jeep1987
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2000 WJ 
 
Join Date: Aug 2006
Location: north carolina
Posts: 276
Surging rpm/near stalling

I have a 2000 limited with the 4.7 and 100k miles.

Almost every time Im coming to a stop and the jeep makes the final downshift, the rpm will jump up above 1k and then drop down to about 400 then bounce back up and down before settling around 600. When it drops down I can feel the engine shudder.

It has also done it when I was sitting at the drive thru with the brakes applied and it does it when I stop and shift to park. When I was in the drive thru it just dropped down to about 300 and shuddered.

Any ideas? I have a video I will post later tonight.

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Unread 11-07-2015, 07:39 PM   #2
madlypat
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Any codes? I would suspect the TPS
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Unread 11-07-2015, 09:14 PM   #3
jeep1987
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No and I forgot to say I cleaned the IAC, replaced the TPS, cleaned the throttle body, and changed spark plugs cause I just bought it.
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Unread 11-07-2015, 09:52 PM   #4
99SK04GTX
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Keep a look out for vacuum leaks, split hoses
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Unread 11-27-2015, 08:56 AM   #5
jeep1987
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Any have any ideas? It seems to be getting worse. Same jump and fall of the rpm when come to a stop and it makes the final downshift. The near stalling when parking is worse. When I go to park and shift from drive to park the rpm almost always jumps up to near 1500 then straight down to about 300. When it drops it will hold around 300 while trying not to shut off, then hop back up to regular idle.
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Unread 11-27-2015, 09:49 AM   #6
Redbaron1973
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1999 WJ 
 
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Location: Preston, UK
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chasing the same thing here..

it pretty much has to be Vacuum but haven't yet found it...
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Unread 11-27-2015, 10:06 AM   #7
86cj74.2L
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Do you have a scanner that reads live data? If so watch the TPS position when it does it knowing your not touching the throttle.
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Unread 11-27-2015, 04:46 PM   #8
jeep1987
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Quote:
Originally Posted by 86cj74.2L View Post
Do you have a scanner that reads live data? If so watch the TPS position when it does it knowing your not touching the throttle.

I don't have one but may be able to find one
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Unread 12-01-2015, 02:13 AM   #9
ApexBeatz
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I read a while back that reflashing your pcm at the dealer fixes this. Mine does it sometimes but just drops down then pops back up
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Unread 12-01-2015, 06:47 AM   #10
mr312712
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My 04 H.O. does It to when I come to a light. Been doing It ever since I got It, It's never stalled, so I try to Ignore It.
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