high idle help
Thread Starter
|
Senior User
Joined: Jul 2010
Posts: 156
Likes: 0
From: Wasilla Alaska
high idle help
1990 f250 with a 5.8L from a 95. so its idling at like 1500 but it will slowly idle down over like 2 or 3 minutes. obviously this aint right. with the idle air controller unplugged it will idle lower but just a little choppy. at lower rpms when accelerating it will jump a little under load.
ive gone through a few spare iac's that werent new but didnt make any difference.
snap on scanner gave no codes with or without the iac plugged in.
runs great with the peddle down...!
any ideas??? thanks
ive gone through a few spare iac's that werent new but didnt make any difference.
snap on scanner gave no codes with or without the iac plugged in.
runs great with the peddle down...!
any ideas??? thanks
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Ford Fuel Injection » Throttle Position Sensor (TPS) Check out the items listed on left of the page in this link and also do electrical tests on TPS as described.
Thread Starter
|
Senior User
Joined: Jul 2010
Posts: 156
Likes: 0
From: Wasilla Alaska
yeah the tps was bad and i replaced it. this problem is with the new tps in place. new tps helped other problems but this is my last little gremlin. other than the idle it runs perfectly.
Thread Starter
|
Senior User
Joined: Jul 2010
Posts: 156
Likes: 0
From: Wasilla Alaska
i guess its possible. i did smoke it and found NOTHING. it doesnt rev or anything and idles down quickly with the iac disconnected. is there a way to take the iac apart to clean it? all the ones i had on there were probably dirty.
Thread Starter
|
Senior User
Joined: Jul 2010
Posts: 156
Likes: 0
From: Wasilla Alaska
i sprayed about a half a can in it! are they sensitive to being dirty? would a little dirtiness make it perform that bad? it seems to move back and forth in there pretty freely...
im just thinkin theres gotta be something else causing the iac not to function properly. would a bad o2 sensor tell the computer to open up the iac? i was also thinking a bad temp sender would make the computer think the truck is cold all the time and keep the iac open.
im just thinkin theres gotta be something else causing the iac not to function properly. would a bad o2 sensor tell the computer to open up the iac? i was also thinking a bad temp sender would make the computer think the truck is cold all the time and keep the iac open.
Trending Topics
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
You can just take the IAC off and spray carb or TB cleaner in it. Then after its clean, you can spray a little PB Blaster in it to lubricate it. This usually works, but when an IAC valve is in that condition, I find that it usually works better to just replace it. You can get a new IAC gasket for 2 dollars, which I would do it you clean it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
