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bearparkmn
New User
Apr 21, 2008, 12:10 PM
Post #1 of 6
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Passport vacuum leak
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I have a 1999 Honda Passport with 166,000 miles. I had the lower intake manifold gaskets replaced through an independent garage in 11/05 due to vacuum leak codes PO 171 and 174. Then, the same thing happened in 11/05 and both lower intake gaskets were replaced again. I just had my car in for an oil change at Midas and asked them to check the recently new check engine lite. The same codes came up and they said it was a vacuum leak intake problem. Why are the gaskets cracking so often? Are their other things that were overlooked the first time? Help please.
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dave284
Enthusiast
Apr 21, 2008, 12:26 PM
Post #2 of 6
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Re: Passport vacuum leak
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Just a thought....the intake might need to be resurfaced....when it was fixed the first time was the codes erased?...and I would take it back to the place where the job was done if it hadn't been to long...plus you need to check all vacuum connections on the intake...it could set off those same codes too.
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bearparkmn
New User
Apr 21, 2008, 1:43 PM
Post #3 of 6
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Re: Passport vacuum leak
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They erase the codes each time. The lower manifold intake gaskets replaced in 03, 05, 07 and now similar diagnosis. I heard that the Passports have this problem but this often? The car works fine after the gaskets are replaced so any vacuum issues must be fixed. Just wondering why the gaskets crack so often.
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Double J
Veteran
/ Moderator
Apr 21, 2008, 2:06 PM
Post #4 of 6
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Re: Passport vacuum leak
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Just a thought..
All three times at an independent shop...
Incorrectly torqued?
Quality of aftermarket gaskets?
(This post was edited by JIM N on Apr 21, 2008, 2:07 PM)
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bearparkmn
New User
Apr 21, 2008, 3:52 PM
Post #5 of 6
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Re: Passport vacuum leak
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Read on one of the posts that the torque specs were revamped to 13 lb. ft. for the 98-03 Isuzu with 3.2 L engine. That is what my Passport 4wd, EX is, I believe. This is all foreign to me, but if this is correct, I will give it to the mechanic as a heads up. They are probably getting the parts from a local parts chain. Is that what you mean by after market? Would the wrong torque make them fail more often? All three times in an independent garage. Don't have any mechanic friends here so thanks for all the advice.
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Double J
Veteran
/ Moderator
Apr 21, 2008, 4:57 PM
Post #6 of 6
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Re: Passport vacuum leak
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Yes...local parts chain(s)= aftermarket..
Anything not supplied by the manufacturer.
If the torque specs are incorrect,it could cause premature failure.
The intake manifold bolts must be tightened to a specific torque as specified by the manufacturer and must be tightened in a certain sequence...If this is not performed correctly,the gaskets will fail.
Maybe he isn't aware of the revised torque specs....
Even tho this is not the norm,some guys dont use a torque wrench to properly torque the bolts..most do ...
Same garage every time?
Maybe change garages and/or suggest using Dealer/manufacturer (OEM) parts.
Also,if all else fails,contact manufacturer customer service and see if there is a known concern with these/any recalls/special policies..etc.
Jim
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