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post #1 of 12 Old 03-13-2014, 01:21 AM Thread Starter
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno
Posts: 52
help please

97 5.2 limited .. every time before I start the ZJ I leave it in the ready position and pump the brakes till hard then start it up ...it has been working pretty good for me so it won't sputter and bog down n die . Idk know why its staying this way but I'm tired of it and wanna know if there is a way to find/fix the problem ..

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post #2 of 12 Old 03-13-2014, 01:37 AM
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,138
Not really sure why you are pumping the brakes prior to starting to keep it running? Does the brake pedal go to the floor after you start it or is it too stiff? Or are you talking about a stalling problem in general?

Poop
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post #3 of 12 Old 03-13-2014, 01:45 AM
bumperthumper
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1995 ZJ 
 
Join Date: Jul 2012
Location: Sussex County, NJ
Posts: 48
umm... ok.... im guessing you have a vacuum leak, and instead of over-airing when you first start it, the vacuum system is working double time to fill the brake booster again, and by the time its done the engine is already stabilized...

that is all my 3am sleep deprived brain can gather.
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post #4 of 12 Old 03-13-2014, 01:52 AM
JasonStebbins
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1997 ZJ 
 
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Quote:
Originally Posted by bumperthumper View Post
umm... ok.... im guessing you have a vacuum leak, and instead of over-airing when you first start it, the vacuum system is working double time to fill the brake booster again, and by the time its done the engine is already stabilized...

that is all my 3am sleep deprived brain can gather.
Yeah I don't really understand the question either so don't feel bad.

Poop
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post #5 of 12 Old 03-13-2014, 07:32 AM
porrsher
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1994 ZJ 
 
Join Date: Mar 2005
Location: Jefferson,GA
Posts: 649
Vacuum issues. Seconded.

1994 Hunter Green ZJ 5.2L Quadratrac
228k Miles, 2" BB.
2002 Slate Grey Grand Cherokee Overland
161k Bone Stock
2008 Black JK Sahara Unlimited (Love it!)
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post #6 of 12 Old 03-15-2014, 04:38 PM Thread Starter
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno
Posts: 52
Well I'f I don't pump the brake a couple times before starting it will bog down really bad like stalling out .. my foot does go down like almost to the floor till it gets stiff enough to not stall out but it has been working good so far ...but were would I check first as for a Vacuum leak ??
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post #7 of 12 Old 03-15-2014, 05:19 PM
xcaliber81
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2004 WJ 
 
Join Date: Jul 2012
Location: Prince George
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Run the jeep and grab a propane torch turn on the propane with out flame when you hit the leak rpms will increase.
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post #8 of 12 Old 03-15-2014, 08:23 PM
JasonStebbins
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1997 ZJ 
 
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Posts: 3,138
Quote:
Originally Posted by Jayzer97 View Post
Well I'f I don't pump the brake a couple times before starting it will bog down really bad like stalling out .. my foot does go down like almost to the floor till it gets stiff enough to not stall out but it has been working good so far ...but were would I check first as for a Vacuum leak ??
All the hoses in the engine bay. Especially the ones on the valve cover, brake booster and exhaust manifold.

How long has this been going on? How long have you owned the ZJ and what kind of maintenance have you performed up to this point? When my brake started going to the floor it was a bad master cylinder, but never caused stalling issues.

There's a few ways to check for them, but soapy water in a spray bottle works. It will bubble if there is a leak in one of the hoses.

Poop
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post #9 of 12 Old 03-16-2014, 03:25 AM Thread Starter
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno
Posts: 52
Ima get to that tomorrow thanks Jason !
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post #10 of 12 Old 03-16-2014, 03:27 AM Thread Starter
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno
Posts: 52
I've had the ZJ for about 7 months ...just finding out **** here n there ...its a pain in my ars...ya know ..well all of you know ..
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post #11 of 12 Old 03-16-2014, 06:39 PM
JasonStebbins
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1997 ZJ 
 
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Quote:
Originally Posted by Jayzer97 View Post
I've had the ZJ for about 7 months ...just finding out **** here n there ...its a pain in my ars...ya know ..well all of you know ..
Oh we all know too well.

Poop
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post #12 of 12 Old 03-16-2014, 11:18 PM
SAR-Swimmer
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1997 ZJ 
 
Join Date: Apr 2009
Location: Mission
Posts: 908
Quote:
Originally Posted by JasonStebbins View Post
Oh we all know too well.
X2, on that one.
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