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1996 Ford Explorer Question: How do you diagnose an intake manifold leak?

 

Question

dcwpapa02, 4.0L V6, Boise, ID, December 03, 2010, 12:06
 Rookie

Check engine light is on-Code P0174 says system too lean-left bank.

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    ZeeTech December 03, 2010, 13:24
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     Master

    I like to use a smoke pump, which blows a thick smoke into the intake and the smoke will be visible where the leak is. It's however expensive, $ 1000,00+

    Zee

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    dcwpapa02, December 03, 2010, 13:33
     Rookie

    Thanks much ZeeTech. It confirms the diagnosis.
    dcw

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    shadetreeauto, December 03, 2010, 14:52
     Journeyman

    hey zee - i still use the carb spray test and wish i could afford the smoke tester.

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    ZeeTech, December 03, 2010, 15:20
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     Master

    I use to do that too, but I have seen 2 car fire in a major chain shop near us because of the carb cleaner and that made me rethink my intake leak diagnostic strategy. :)
    The big advantage of the smoke pump -beside the safety- is that you can really pinpoint the leak and it also works on the EVAP system. I was using it to find air suspension leaks too.
    I have a Redline Smoke Pro and I love it.

    Zee

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  • Answer #2

    DaveJHM December 03, 2010, 21:34
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     Master

    Great topic. You can do all kinds of great things with a smoke machine. Such as trying to find the source of pesky wind noises inside a car. Good stuff. Worth the investment.

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