high rev on startup of new 4.7

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Dec 14, 2011 | 04:50 PM

#16

dukie564

☠ CF Sheriff ☠

Joined: Nov 2009

Posts: 15,197

Likes: 18

From: Aberdeen, MD

Year: 1995

Model: Cherokee

Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts

throttle cable stuck
Throttle position sensor malfunction (((<--- I'm betting this one)))
Map sensor malfunction
bad ground or short

is the butterfly in the throttle body opening when it does this?

Dec 14, 2011 | 05:17 PM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

I'll bet a six-pack of Guinness that the intake manifold is not seated fully to the head and is hung up on the dowel pins. I accept PayPal.

Dec 15, 2011 | 11:07 AM

#18

ol'DixieJeep

Thread Starter

CF Veteran

Joined: Oct 2011

Posts: 1,467

Likes: 2

From: Warrenton MO

Year: 2000

Model: Cherokee

Engine: 4.7L I6

DING DING DING
intake wasnt seated all the way in the back...

runs awesome now. video goin up in what did you do to your jeep today thread.

Dec 15, 2011 | 11:09 AM

#19

TheJerm

CF Veteran

Joined: Jun 2010

Posts: 2,501

Likes: 4

From: Flint/Asheville

Year: 1995

Model: Cherokee

Engine: 4.0 HO

See, I told you had a bad vacuum leak lol

Dec 15, 2011 | 11:09 AM

#20

dukie564

☠ CF Sheriff ☠

Joined: Nov 2009

Posts: 15,197

Likes: 18

From: Aberdeen, MD

Year: 1995

Model: Cherokee

Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts

good call cruiser

Dec 15, 2011 | 11:13 AM

#21

ol'DixieJeep

Thread Starter

CF Veteran

Joined: Oct 2011

Posts: 1,467

Likes: 2

From: Warrenton MO

Year: 2000

Model: Cherokee

Engine: 4.7L I6

Quote:

Originally Posted by TheJerm

See, I told you had a bad vacuum leak lol

LMAO yea, i dont really consider that a vaccume leak, even though technically speaking you could say that...

Dec 15, 2011 | 03:05 PM

#22

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Guinness is $8.99, tax is $.66, for a total of $9.65.

Dec 15, 2011 | 04:15 PM

#23

ol'DixieJeep

Thread Starter

CF Veteran

Joined: Oct 2011

Posts: 1,467

Likes: 2

From: Warrenton MO

Year: 2000

Model: Cherokee

Engine: 4.7L I6

Quote:

Originally Posted by cruiser54

Guinness is $8.99, tax is $.66, for a total of $9.65.

i am on a stag kick so ill send you that lol i already figured that it was prolly the intake though. just wanted to see what else couldve done it before i did all that work lol

Dec 15, 2011 | 08:16 PM

#24

N20jeep

CF Veteran

Joined: Mar 2010

Posts: 6,685

Likes: 6

From: Jacksonville, FL

Year: 92

Model: Cherokee

Engine: 4.0

i know im late to the party....

but the only thing to cause a high rev like that would be the intake not seated.

there is no sensor that will cause this (for future reference)

Dec 15, 2011 | 08:18 PM

#25

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by N20jeep

i know im late to the party....

but the only thing to cause a high rev like that would be the intake not seated.

there is no sensor that will cause this (for future reference)

You ARE late!! I got dibs on the Guinness already. LOL.