P1506 obd code question

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Feb 7, 2009 | 09:59 PM

uno

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P1506 obd code question

I still have high idle after replacing the iac, vac hoses seem good , whats next? I dont feel good about backing out the throtle stop screw

Feb 7, 2009 | 10:34 PM

Oldtrucknut7077

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Try this link and hopefully it will help. If not do an advanced search.
https://www.ford-trucks.com/forums/4...flow-cats.html

Feb 8, 2009 | 08:24 PM

uno

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thank you for the link - do you think i should adjust the throtle stop screw ? my year is only threaded with no head to grab.

Feb 8, 2009 | 08:53 PM

tommyleea

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Adjustiing idle stop will probably just mask the real problem. Disconnect the IAC with the engine running, and see if the engine quits. Check the connector for corrosion. Sure sounds like IAC issue. What happens if you rev it up several times? Does the idle ever drop down, like when it warms up?

Feb 8, 2009 | 09:16 PM

uno

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thank you in advance for that ! i am thinking the same thing. should i look at replacing the TPS, the TPS can not be adjusted can it? if it can i dont think i have the programming in my scanner> it is to be some where between .90v to .99v, what are your thoughts ?

Feb 8, 2009 | 09:19 PM

tommyleea

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ReRead my previous post.

Feb 8, 2009 | 10:13 PM

uno

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well tommy the IAC has just been replaced, like one week ago. the RPM seems to go back to 1100. as for revving the engine and under a cold start it gets up around 1900-2100 then SLOWLY settles back to 1100, sometimes as little as 980. i have not disconnected the IAC when running i will try that, i dont know at this point. thanks again. i noticed one of your rides is the 63. i refurbed a 69 f250 with a 73 linc 460 and a C6 from a 350 of the same year. had a lot of fun with that, it was a very thirsty truck let me tell you !

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Feb 9, 2009 | 05:43 AM

projectSHO89

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From: St Louis

Feel free to EDIT a previous post for up to an hour or few instead of making a new post or a new thread....

Do the simple test already recommended. Until you do, you're just wasting your time.

Feb 9, 2009 | 06:06 AM

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tommyleea

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Quote:

Originally Posted by uno

sorry i think i made a mistake with one of the other guys that had me check a link, one of them had the the 63. oops.

No problem, I do have a 66 though. I see on another thread that you have a K&N filter. I have seen this filter cause problems, because of the air flow. Just a shot in the dark, but you might try installing a standard filter, and see what happens. Not sure of the correlation between when you changed the filter, and your idle problem. Just a thought.

TommyJ

Feb 9, 2009 | 09:39 AM

#11

uno

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they also say that the definition of insanity is to repeat the same thing and expect a different outcome

Feb 9, 2009 | 12:50 PM

#12

uno

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tommy thank you for all the help, looks like it will be a new TPS. also followed your advice to clean the connections and used marine electrical contact grease ( from the boat ). thanks again, got any photos of the 66 ?