Damn IAC Valve!!
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Senior User
Joined: Jul 2008
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From: L.A.
Damn IAC Valve!!
Well here is the story, a while back the X started stalling, so i narrowed it down to the IAC valve, so i cleaned it and no problem afterwards CEL went off and all was good. Then a week later boom it happens again so i spring for a new IAC valve, put it in today and no luck its still doing it like i didnt even do anything, so flood me with any ideas.
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Senior User
Joined: Jul 2008
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From: L.A.
I left something out at the beggining, when it first started stalling and the cel came on i had the code p0720 (output speed sensor) so i replaced that with no luck,then reading some post thru here and talking with a few ppl it led me to belive it was the iac valve, with no luck its doing the same thing warm or cold my o\d light starts flashing and then rpm's drop then dead, but if i put it in park when i pull up to the lights then put in in gear when it goes green im good, still showing the code p0720.
More Turbo
Joined: Jul 2010
Posts: 669
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From: Tennessee
What exactly is it doing? What are the symptoms? Mine did not want to idle till it warmed up.
Perry
Perry
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Senior User
Joined: Jul 2008
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From: L.A.
no,if you leave it in gear and youre stopped to long it will sputter then die but if the o\d light starts blinking and i start accelerating after about 30secs the o\d light stops blinking
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Cargo Master
Joined: Jul 2009
Posts: 2,885
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From: Chino, California
VSS has to do with the cruise control. Is that working ok?
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
I just read a post that had the same code and problems you have. He changed his alternator and it fixed it. The alternator was creating a radio frequency interference and messing up the sensors. I know, it sounds far fetched but I read two separate posts from different forums, both saying the same thing. How old is your alt?
Posting Guru
Joined: Jun 2005
Posts: 1,268
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From: central Louisiana
here's what i went through with the same issue..... mine has been trouble free since this post!!
https://www.ford-trucks.com/forums/9...long-post.html
https://www.ford-trucks.com/forums/9...long-post.html
More Turbo
Joined: Jul 2010
Posts: 669
Likes: 7
From: Tennessee
It is possible that a bad COP is causing all this misery. Open the hood at night and see if anything jumps out at you (spark). You might have a torque converter intermittantly locking up causeing the stall but it would not stall with the wheels off the ground or when it is in neutral. If the TC locks up when it is not supposed to the PCM might think the sensor is bad because the output shaft is turning when it is not supposed to.
Perry
Perry
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Senior User
Joined: Jul 2008
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From: L.A.
I just read a post that had the same code and problems you have. He changed his alternator and it fixed it. The alternator was creating a radio frequency interference and messing up the sensors. I know, it sounds far fetched but I read two separate posts from different forums, both saying the same thing. How old is your alt?
Cargo Master
Joined: Jul 2009
Posts: 2,885
Likes: 26
From: Chino, California
Yes, you can take it to Autozone or other auto parts store. I don't think they can detect RF interference.