Cranks, no-start. IAC?
Thread Starter
|
New User
Joined: Jun 2010
Posts: 6
Likes: 0
Cranks, no-start. IAC?
I have an 03 F 150 with the 5.4. Occasionally when going to start it it will crank but not start until I hit the gas. It also has a rough idle. When I hook up my scanner it shows no DTC's.
My first thought would be the IAC, should that throw a code? I tried cleaning it, but according to one of the stickies cleaning doesn't help very often.
So basically what I am asking is will a bad IAC cause a no start?
If I should replace it, is there any brand that is better than the others, or should I stick with motorcraft?
Thanks!
My first thought would be the IAC, should that throw a code? I tried cleaning it, but according to one of the stickies cleaning doesn't help very often.
So basically what I am asking is will a bad IAC cause a no start?
If I should replace it, is there any brand that is better than the others, or should I stick with motorcraft?
Thanks!
Senior User
Joined: Jan 2010
Posts: 210
Likes: 0
The IAC I put in mine was from Napa Auto Parts. I know it wasn't Motorcraft. Mine didn't throw a code either, just started idling rough. After reading several posts on here, replaced it and it has idled fine ever since.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
BTW, pumping the throttle does not do anything.
It's not a carburator.
Only thing it would do is allow air to enter as the IAC would do.
Holding wide open above 7/8 throttle, as detected by the TPS, will shut the fuel off to the injectors.
This is how you would clean out the cylinders from being flooded from an ignition failure or fouled plugs.
It's not a carburator.
Only thing it would do is allow air to enter as the IAC would do.
Holding wide open above 7/8 throttle, as detected by the TPS, will shut the fuel off to the injectors.
This is how you would clean out the cylinders from being flooded from an ignition failure or fouled plugs.
Thread
Thread Starter
Forum
Replies
Last Post
Jonathan Stone
1987 - 1996 F150 & Larger F-Series Trucks
4
Aug 24, 2016 04:11 PM
