97 Grand Cherokee missing hose on engine?
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Joined: Jan 2014
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Model: Cherokee
97 Grand Cherokee missing hose on engine?
Found this uncovered nipple on the right side of the engine, pics on google show it covered. It's pulling in air and if I cover it the engine D'Revs for a couple second before coming back up. Whats it used for?
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 740
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
I believe it's the vacuum supply port for the vapor canister purge. I'm not sure because I don't own a ZJ anymore and I'm not going out the -5* temps with a -37* windchill to check my WJ. wcshale is right, though. Seal it off until you know. It's making the PCM compensate for a lean mixture.
Last edited by dave1123; Jan 8, 2014 at 05:47 AM.
Senior Member
Joined: Mar 2011
Posts: 651
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From: Norway
Year: 1993
Model: Grand Cherokee
Engine: 4.0L I6
I believe it's the vacuum supply port for the vapor canister purge. I'm not sure because I don't own a ZJ anymore and I'm not going out the -5* temps with a -37* windchill to check my WJ. wcshale is right, though. Seal it off until you know. It's making the PCM compensate for a lean mixture.
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