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Unread 04-26-2013, 07:09 PM   #1
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2004 WJ 
Join Date: Apr 2013
Location: saint mary, mo
Posts: 4
New GC owner with question

I just purchased a used 2004 GC Laredo with 127K. It's in decent shape and seems to run good. It has the 4.0 with auto tranny. I have a couple of questions that a search did not find an answer. First, the tachometer shows an idle of 750 RPMs after warm. It seems higher but I will trust it. When I put it in gear, the tach does not drop at all. All other vehicles I have owned the tach drops when I put the truck in gear. Can anyone explain this?

Also, when I pull in the garage after driving home, I hear a loud vibration and roaring sound from the front of the truck. I can't hear it outside the truck, only in the cabin. It almost sounds like the blower is on high speed but the HVAC is off. If anyone could help?



jreask is offline   Reply With Quote
Unread 04-26-2013, 08:20 PM   #2
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2002 WJ 
Join Date: Feb 2013
Location: halifax, ns
Posts: 813
My 02/4.7 has no perceptible change in rpm going in and out of gear, but I never gave it much thought. I assume this is just something that jeep managed to get right when they built these things. No idea on the noise though, is it your rad fan?
1993 FZR600RR
2002 Subaru WRX Sedan WRB (314k miles and counting)
2002 GC Overland (90k miles and fingers crossed)
"Bought, Not Built"
lazyWJ is offline   Reply With Quote
Unread 04-26-2013, 08:49 PM   #3
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2001 WJ 
Join Date: Aug 2011
Location: Plainfield, Illinois
Posts: 936
It may be idling a little high, mine idles at 600, 4.7 non HO. If you suspect high idle clean the TB and IAC, may need to replace IAC. cheap and easy.
2001 WJ Limited 4.7 Powertech, Quadradrive, 2" BDS lift.
"If you can't get there in a Jeep, You should reconsider going there."
lvngtheJEEPlife is offline   Reply With Quote

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