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  #1  
Old November 25th, 2004, 04:05 PM
Eric Siepmann
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Eric W. Siepmann
1997 Defender 90 SW
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Location: Chicago, IL, Cook
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Vacuum Leak

Was at the stealership to hook up to the test book.



"Test book system. Codes for 02 sensors up and downstream open cicuit. Vacuum leak at intake."

Suggested changing the intake manifold gasket. Vacuum leak was throwing off 02 sensors.

Is this the valley gasket under the intake trumpets?
Any other gaskets involved? Plenum chamber looks like it has haylomar sealant.
Looks like a straight forward job that can be done in a weekend. Anything to look forward to?

Just don't feel like paying 5+ hours at 125 a pop to get this done for a $20 dollar gasket.

TIA,

EwS
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  #2  
Old November 25th, 2004, 05:23 PM
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Davis
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Chris Davis
94 NAS D90 6.2LS
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With the engine running, spray carb cleaner strategically around the engine compartment to find the vaccum leak--when you find it, the engine rpm will go up as it draws the carb cleaner into the engine--this will identify where the leak is as it might be a hose in lieu of the gasket. The valley gasket is slightly more involved of a change, but totally doable. the intake plenum is indeed sealed with hylomar. But again, first detect where the leak is coming from and pay careful attention to all the vaccum hoses (such as those to the brake servo and all those running into the front of the plenum). Although not unheard of having a gasket leak, it is usually a hose.
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Old November 25th, 2004, 09:11 PM
Eric Siepmann
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Eric W. Siepmann
1997 Defender 90 SW
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Chris,

Sounds much more plausible as the codes from fourfold say nothing about intake itself. Not to rule it out, I'll check the hoses first. This is the same dealership that told me my heads needed to be done...

Hopefully it won't snow anymore tommorrow...

EwS




Code 28 - Air leak
check for air leaks in the following areas:
Hose, air flow meter to plenum

Breather system hoses to plenum

Brake servo hose

Vacuum reservoir hose (fresh air solenoid)

Distributor vacuum advance

Hose, purge valce to plenum

Injector seals

Joint - bypass air valve to plenum plenum chamber to ram housing ram housing to inlet manifold inlet manifold to cylinder head bypass air valve hose
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