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post #1 of (permalink) Old 09-07-2003, 12:10 AM Thread Starter
 
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Need help with 1995 F150, 2100rpm idle?

351, automatic, just started this about a week ago

we scanned the codes, it showed 112, we replaced that sensor ($20 I think) and it still throws the code, and it STILL idles at 2100RPM

there is no obvious vacum leak I can find, has anyone else experioenced this?

thanks in advance for ANY help!

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post #2 of (permalink) Old 09-07-2003, 01:22 AM
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Re: Need help with 1995 F150, 2100rpm idle?

Hmmm....ACT sensor huh? Well, first I'd be sure you actually replaced the ACT sensor (in the IM near the fuel rail on driver's side) and not something else. Not insulting your intelligence. Also make sure it was a quality unit (read: not Autozone) and that the wiring to the sensor is ok.

Then I'd clean the tb, making sure the butterflies arent' stuck open and that the return spring isn't tired. Also clean the IAC on the side of the tb.

If none of that works.........then it's truly frustrating if that is the only code you are getting. I'd say TPS, EVP would be next suspects, but they should throw a code.
post #3 of (permalink) Old 09-07-2003, 01:30 AM Thread Starter
 
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Re: Need help with 1995 F150, 2100rpm idle?

yep, the air charge temp sensor..

in the manifold, driver side, screwes straight down into the lower manifold, and is near the fuel rail.

How would I check the wireing? it has logic volatage (+5), earlier my meter was not reading resistance only voltage, NOW i have another meter to check resistance values with, but IM in for the night trying to make a plan of attack for tomorow.

I havent dissassembled the TB BUT the outside linkages to the butterflies are going to the stops, so unless the actuators are twisted it seems like the butterflys would be closed also.

Its my Fathers truck, and he needs to leave town tomorow, and park it at the airport 1 hour away, so its really got us in a bind.

thanks for your help!
any other ideas?
he is telling me now there was another code, that was a $60 part, he is asleep now, but possiboly that could be the culprit.

the ACT put in came from NAPA

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post #4 of (permalink) Old 09-07-2003, 01:43 AM
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Re: Need help with 1995 F150, 2100rpm idle?

sell it and get a Chevy! [img]images/graemlins/chairfall.gif[/img]

Matt, what time is his flight? I could attempt to help tomorrow but I'm going fishing around noon, so it'd have to be morning (not too early though! [img]images/graemlins/wink.gif[/img] ) In fact, if you're into night owl stuff, I'm not doing crap tonight so send me a PM if you want me to come over... kinda bored here [img]images/graemlins/smirk.gif[/img] Oh yeah, <font color="red">HOW BOUT DEM HAWGS!!!</font color> [img]images/graemlins/40BEER.gif[/img]
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post #5 of (permalink) Old 09-07-2003, 01:48 AM Thread Starter
 
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Re: Need help with 1995 F150, 2100rpm idle?

Go pigs, looks like a good season opener!

I didnt goto tthe game, the folks did, I loaned them my yota ( we are all at the lakehouse)

I appreciate the offer for help, I know its just some simple little something that needs to be replaced. thats whats really aggrevating about Fuel injection. its great when it works, it makes me say very bad things when it doesnt work right.

Hey I havent seen you in the engineering building in a while, Ive got another class at the same time as last semester in 209!

gimme a call or stop by some time, we will swill some beers and look at my pile of parts.. haha

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post #6 of (permalink) Old 09-07-2003, 01:54 AM
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Re: Need help with 1995 F150, 2100rpm idle?

nope, i don't step foot on campus til 1:30 on T/R [img]images/graemlins/grin.gif[/img] [img]images/graemlins/cool.gif[/img]
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post #7 of (permalink) Old 09-22-2003, 12:10 PM
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Re: Need help with 1995 F150, 2100rpm idle?

Hey, mine did that to, and i found that the PCV valve had broken in half. Have u done any wheelin lately? Anyways it's on the passenger side valve cover, under the big intake, at the very back. All u can see is a black hose sticking out. it comes from the top of the intake and goes bask into the valve cover. Just a thought, i just zip-tied mine back together, it works. Also check to see if it rattles(a good thing) otherwise, blow compressed air through it to clean it out. u don't have to but a new one. just me experiences.
post #8 of (permalink) Old 09-22-2003, 03:26 PM
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Re: Need help with 1995 F150, 2100rpm idle?

Matt, did you ever fix this?
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post #9 of (permalink) Old 09-23-2003, 07:38 PM
 
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Re: Need help with 1995 F150, 2100rpm idle?

Hello,
I had some idle problems in both my 87 F150 but it was low; on the verge of not running. My reasearch (Haynes and Mustang Cobra sites) led me to the "Idler Air Controler" or as I've otherwise seen it the "IAC Motor". Replacing this with a new unit helped; it actually ran without life support (constant throttle input). The throttle position sensor (TPS) was another canidate; I did not replace that though.

Anyway, the IAC was this thing about an inch in diameter, about 4 or so inches long and had an electrical connection on one end (forward I believe). It was mounted on the drivers side, forward end of the motor with two small bolts and was 40 bucks if memory serves. The parts counter guy swore he had cleaned his many times; removing the entire electrical end and drowning/Qtipping the inside of the other end using some sort of solvent. Its free, give it a whirl.

This may help, maybe not. 40 bucks, I've given more to strippers so I felt it was worth a try.
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post #10 of (permalink) Old 09-24-2003, 12:41 AM
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Re: Need help with 1995 F150, 2100rpm idle?

yeah the IAC does gunk up with carbon, mine was pretty bad when i had the TB off awhile back. mine is getting pissy at low revs so I think it's about time to do it again [img]images/graemlins/smirk.gif[/img]
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