idle adjustment

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Aug 27, 2009 | 11:58 PM

dakoda60

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idle adjustment

i have a 87 f150 4.9 300 straight 6 and it dies most times when i first start it and its cause its idlein at 500 rpm and i think it should idle at bout 700 to 900 if thats correct and i was wondering how u adjust it to make it idle at a higher rpm because this truck is the first efi vehicle ive owned n i dont know how to mess with those kind of idlers so any helpful hints n tips would be greatly appreciated thanks

Aug 28, 2009 | 06:37 AM

dustybumpers

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From: In my own world

no adjustment, you have to take a pair of pliers, and do a little bending to fine tune it. usually there is another problem that needs to be adderessed, probably a vaccume leak some where.

Aug 28, 2009 | 07:04 AM

underwaterboy82

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yea there is no way of chaning it without reprograming the ecm. like charlie said check your vaccum like but also take a look at the icu or the tps. does it run right other than idle

jake

Aug 28, 2009 | 03:52 PM

dakoda60

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yes it runs fine other than the idle it just idles way to low its idlin at 500

Aug 28, 2009 | 09:22 PM

Prozon

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From: Olympia

Check to make sure there are all the vacume lines hooked up.

Same problem I had with my truck when I got it. There was a large vacume on the back of the intake that was leaking.

Aug 29, 2009 | 12:01 PM

srad

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Sorry but I am beginner as well what does mean ICU and TPS

Aug 29, 2009 | 12:36 PM

Lazy K

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The TPS is Throttle Position Sensor, don`t know what ICU is.
However the thing that controls idle is the Idle Air Control valve. Quite often cleaning it with carb cleaner is all that is needed.
Also a basic tune up of plugs, possibly wires, fuel filter, air filter and PCV can work wonders.