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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 11-13-2001, 10:13 PM
mtfl1 mtfl1 is offline
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pcv valve problems

I have a 1990 f150 302 5.0.It runs ok for about 2 or 3 minutes
then starts to loape (rpms up down,up down ect.) I removed the pcv
valve from the valve cover and then removed the pcv valve from its hose.Now it runs excellent.I bought a new pcv valve and put it in and it runs awful again.So its not the pcv valve.Can any one tell me what the problem could be.It seems like the vacuum from the hose that the pcv valve is in is too high.Well Im thoughly confused.Any help would be greatly appreciated.thanks mike

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Old 11-13-2001, 10:58 PM
pross pross is offline
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pcv valve problems

its probably your IAC contol valve, when you disconnect the pcv valve, it allows the engine to breath in air and probably idles faster.The IAC is the only way the engine gets air while idling. there's only 2 screws holding it onto the intake throttle body. There's a small sliding valve in there that can get carboned up. It must slide freely. Are you getting a check engine lite?
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Old 11-14-2001, 12:17 AM
PAUL_2 PAUL_2 is offline
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pcv valve problems

There is also a pcv filter located inside the air filter housing that could be causing the problem . Make sure all the pcv passages are clear of sludge etc .
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Old 11-14-2001, 05:57 AM
mtfl1 mtfl1 is offline
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pcv valve problems

I just put(last saturday) a brand new 54.00 iac valve and that wasnt it.Any other suggestions.At least I've found something obviously wrong,which is half the battle.thank you very much mike.
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Old 11-14-2001, 06:00 AM
mtfl1 mtfl1 is offline
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pcv valve problems

Thank you I'll check that tonight after work.thanks Mike
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Old 11-14-2001, 10:04 AM
cwlo cwlo is offline
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pcv valve problems

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Old 11-14-2001, 10:04 AM
 
 
 
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