P0442 EVAP Control System Leak Detection - Ford Truck Enthusiasts Forums



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P0442 EVAP Control System Leak Detection

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Old 12-22-2004, 08:41 PM
wildbill1963 wildbill1963 is offline
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P0442 EVAP Control System Leak Detection

(Small LEak)....What the heck is this? and how do I fix it?
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Old 12-22-2004, 08:51 PM
wildbill1963 wildbill1963 is offline
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Thanks to Google, I found my answer:

What does that mean?This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

SymptomsYou likely won't notice any drivability problems.

CausesA code P0442 most likely means one or more of the following has happened:

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
A small leak/hole in a fuel vapor hose/tube
Other small leak in EVAP system
Faulty vent o-ring seal
Possible SolutionsWith a P0442, the most common repair is to:

Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses
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Old 09-10-2010, 03:06 PM
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rapturez rapturez is offline
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p0442??

did you try any of these repairs?... if so did they work. I had just cleared the bank too lean problems and was with no engine light for about 2 weeks, now it is back and by scanning I got this code p0442.... any advice on where i should check?
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Old 09-10-2010, 03:55 PM
wildbill1963 wildbill1963 is offline
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Quote:
Originally Posted by rapturez View Post
did you try any of these repairs?... if so did they work. I had just cleared the bank too lean problems and was with no engine light for about 2 weeks, now it is back and by scanning I got this code p0442.... any advice on where i should check?
Turned out a common issue on the V6 at least that I found so far. The o-rings that seal the intake runners (6 of them) to the engine dry out over time and cause a leak. the only way to detect them is to do smoke test.
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Old 09-10-2010, 09:28 PM
projectSHO89 projectSHO89 is online now
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I don't see any possible way that an intake manifold leak can cause an evaporative emissions failure.... "Lean" codes, definitely - but a P0442, no.
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Old 09-10-2010, 09:30 PM
wildbill1963 wildbill1963 is offline
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That was what mine was doing and that was we did to fix it.
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2003, 97, code, control, detector, escape, evap, f150, ford, fuel, hosetube, leak, leakhole, p0442, po442, read, small, system, vapor

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