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Unread 03-13-2014, 12:21 AM   #1
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno, California
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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Unread 03-13-2014, 12:37 AM   #2
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?
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Unread 03-13-2014, 12:45 AM   #3
bumperthumper
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1995 ZJ 
 
Join Date: Jul 2012
Location: Sussex County, NJ, New Jersey
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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Unread 03-13-2014, 12:52 AM   #4
JasonStebbins
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1997 ZJ 
 
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Posts: 3,138
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.
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Unread 03-13-2014, 06:32 AM   #5
porrsher
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1994 ZJ 
 
Join Date: Mar 2005
Location: Jefferson,GA, Georgia
Posts: 638
Vacuum issues. Seconded.
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1994 Hunter Green ZJ 5.2L Quadratrac
228k Miles, 2" BB.
2002 Slate Grey Grand Cherokee Overland
161k Bone Stock
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Unread 03-15-2014, 03:38 PM   #6
Jayzer97
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1997 ZJ 
 
Join Date: Sep 2013
Location: Fresno, California
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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Unread 03-15-2014, 04:19 PM   #7
xcaliber81
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1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 2,743
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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Im indian my elders name is Jeep Grand Cherokee, I mean Chief Grand Cherokee. Quoted from Peter Griffin.
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Unread 03-15-2014, 07:23 PM   #8
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.
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Unread 03-16-2014, 02:25 AM   #9
Jayzer97
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Ima get to that tomorrow thanks Jason !
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Unread 03-16-2014, 02:27 AM   #10
Jayzer97
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1997 ZJ 
 
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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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Unread 03-16-2014, 05:39 PM   #11
JasonStebbins
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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.
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Unread 03-16-2014, 10:18 PM   #12
SAR-Swimmer
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1997 ZJ 
 
Join Date: Apr 2009
Location: Mission, B.C. Canada
Posts: 752
Quote:
Originally Posted by JasonStebbins View Post
Oh we all know too well.
X2, on that one.
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