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Unread 01-27-2013, 07:58 PM   #1
storode
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Join Date: Jan 2013
Posts: 5
Mystery Part

Need some help-- there is a part that is located just under the power steering pump that has a pulley. It is making a loud chattering sound and I am guessing is failing but I don't know what it is. It's connected to a hose that has a breather on it s I thought it was a pump of some kind.
This is a 78 j
Cherokee Chief. It is not an AC pump.

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Unread 01-27-2013, 08:15 PM   #2
olliehopnoodle
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1982 FSJ Cherokee 
 
Join Date: Sep 2012
Location: mesa, az
Posts: 1,056
It's part of your A.I.R. system. The pump goes bad. Not too expensive to replace.
It forces air into the exhaust manifold. This helps with unburnt fuel. (simple explaination). It's not a bad system and it does some good with no real power loss. It was eventually obsoleted with fuel injection. (But not on OUR rigs...)
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Unread 01-28-2013, 12:34 PM   #3
storode
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Quote:
Originally Posted by olliehopnoodle
It's part of your A.I.R. system. The pump goes bad. Not too expensive to replace.
It forces air into the exhaust manifold. This helps with unburnt fuel. (simple explaination). It's not a bad system and it does some good with no real power loss. It was eventually obsoleted with fuel injection. (But not on OUR rigs...)
Thanks for the response. I will get the part ordered.
Stephen
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Unread 01-28-2013, 04:49 PM   #4
pleontks
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1976 J-Series Truck 
 
Join Date: Apr 2010
Location: Whetstone, Az
Posts: 1,130
I've got a crate full of smog stuff.....if you come here, anyways. I hate shipping.
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Unread 01-30-2013, 09:43 PM   #5
storode
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Quote:
Originally Posted by pleontks
I've got a crate full of smog stuff.....if you come here, anyways. I hate shipping.
Where are you located? If your in the SF Bay Area, I could take a look.
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Unread 02-01-2013, 04:54 PM   #6
super98lsc
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1999 WJ 
 
Join Date: May 2006
Location: Austin, TX
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I know were supposed to have it on etc.. but i removed all of it on my 90. I rebuilt the carb, did the MSD TFI update and tuned with my LM2 wideband to get good fuel trims. I did do this in stages and can tell you that air pump (mine was new as well) draws some power off the engine, it was smoother, quieter, revved easier and overall my mods/tuning brought me up to 13 city with 31x10.50's and 3.31 gearing. Not a fan of that AIR system. the newer cars that have it (my BMW did) use an electric blower for it now vs the belt drive, so the loss in power isnt 100% but only when the system is active.
20130107_005604.jpg  
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Unread 02-01-2013, 07:16 PM   #7
storode
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Quote:
Originally Posted by super98lsc
I know were supposed to have it on etc.. but i removed all of it on my 90. I rebuilt the carb, did the MSD TFI update and tuned with my LM2 wideband to get good fuel trims. I did do this in stages and can tell you that air pump (mine was new as well) draws some power off the engine, it was smoother, quieter, revved easier and overall my mods/tuning brought me up to 13 city with 31x10.50's and 3.31 gearing. Not a fan of that AIR system. the newer cars that have it (my BMW did) use an electric blower for it now vs the belt drive, so the loss in power isnt 100% but only when the system is active.
I guess the only concern I would have then,since I'm in California, is will it pass smog? Do you think there eWorld be an issue?
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Unread 02-02-2013, 09:29 AM   #8
super98lsc
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1999 WJ 
 
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Location: Austin, TX
Posts: 1,414
It won't pass, I just plan to connect mine once a year
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 02-02-2013, 12:23 PM   #9
storode
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Quote:
Originally Posted by super98lsc
It won't pass, I just plan to connect mine once a year
Got it. Thanks again for the help.
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