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ThatJeeper2017 · 06-17-2017, 07:34 PM

Hi all Jeep folks, just finished a semi-engine overhaul and when I tried to start it, the engine immediately went to 4000 rpm. Any guesses as to why this is happening? Thanks.

ThatJeeper2017 · 06-17-2017, 07:34 PM

This was also a 2005 jeep 4.0L I6.

Correll · 06-23-2017, 03:19 PM

Either your throttle cable is stuck. Or, you did not get the manifold lined up correctly and have a massive un-metered vacuum leak. It is possible to not get the manifold all the way down on those engines because they share bolts with the exhaust manifold. I believe I had a friend do what you may have done and he had the intake manifold slightly off and it was not sealed to the cylinder head. And his revved to the moon on start up.

Shinchu · 06-30-2017, 09:26 AM

yup I was thinking vacuum leak.

ThatJeeper2017 · 06-30-2017, 05:06 PM

Thanks guys, turns out that the manifold wasn't sitting correctly on one of the allignment stubs on the block and that cause the vacuum leak.

06-17-2017, 07:34 PM	#1
ThatJeeper2017 Rock Crawler Join Date: Mar 2017 Location: Rubicon Trail Posts: 518	Jeep Problem... Hi all Jeep folks, just finished a semi-engine overhaul and when I tried to start it, the engine immediately went to 4000 rpm. Any guesses as to why this is happening? Thanks.

06-17-2017, 07:34 PM	#2
ThatJeeper2017 Rock Crawler Join Date: Mar 2017 Location: Rubicon Trail Posts: 518	Re: Jeep Problem... This was also a 2005 jeep 4.0L I6.

06-23-2017, 03:19 PM	#3
Correll Pebble Pounder Join Date: Sep 2014 Location: Hamilton Montana Posts: 135	Re: Jeep Problem... Either your throttle cable is stuck. Or, you did not get the manifold lined up correctly and have a massive un-metered vacuum leak. It is possible to not get the manifold all the way down on those engines because they share bolts with the exhaust manifold. I believe I had a friend do what you may have done and he had the intake manifold slightly off and it was not sealed to the cylinder head. And his revved to the moon on start up. Last edited by Correll; 06-23-2017 at 03:21 PM.

06-30-2017, 09:26 AM	#4
Shinchu I wanna be Dave Join Date: Dec 2016 Location: san diego Posts: 2,723	Re: Jeep Problem... yup I was thinking vacuum leak.

06-30-2017, 05:06 PM	#5
ThatJeeper2017 Rock Crawler Join Date: Mar 2017 Location: Rubicon Trail Posts: 518	Re: Jeep Problem... Thanks guys, turns out that the manifold wasn't sitting correctly on one of the allignment stubs on the block and that cause the vacuum leak.

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