IAC valve
Thread Starter
|
Freshman User
Joined: Apr 2002
Posts: 33
Likes: 0
IAC valve
I am about to change out my IAC valve tomorrow and I noticed that the new replacement valve from NAPA has what appears to be an "adjusting ****" on it. My shop manual makes no reference to this ****. What is the purpose of it and how do I go about setting it up correctly? Thanks!
Posting Guru
Joined: Dec 2001
Posts: 2,017
Likes: 2
From: Southeast FLA
IAC valve
Do you think the IAC contributes to hard-to-start-when-warm problems? I've had that for awhile (and it isn't injector o-ring leakage 'cause it starts fine after sitting all night), and it sure is a pain cranking it twice to get it to start.
Thread Starter
|
Freshman User
Joined: Apr 2002
Posts: 33
Likes: 0
IAC valve
I hope so! I tried to check everything else that was mentioned in previous posts about idle and hard to start problems. No error codes, fuel pressure good at key on engine off or running, cleaned throttle body and tried to clean IAC valve( which gave some improvement - there was some pretty nasty looking stuff that came out with the cleaner), and changed fuel filter just in case. When starting first thing in the morning a tap on the key is all that is needed. After running for a while, and then shutting off I have to crank it for about 30 secs to a minute. When it does start a good puff a black smoke comes out the exhaust (is this from all the fuel from cranking or from not enough air?) When the truck idles, it constantly varies from 750 to 1000 rpm. I'll keep you posted...
Posting Guru
Joined: Dec 2001
Posts: 2,017
Likes: 2
From: Southeast FLA
IAC valve
[updated:LAST EDITED ON 21-Apr-02 AT 09:30 PM (EST)]Yet another IAC question:
Would there be any reason my truck would drive better around town after cleaning out the IAC valve? If the IAC is for idle only, I can't see why it would, yet the truck seemed to work indescribably 'smoother' today after the cleaning of the IAC internal plastic(?) part. Could just bee the cool weather though.
Would there be any reason my truck would drive better around town after cleaning out the IAC valve? If the IAC is for idle only, I can't see why it would, yet the truck seemed to work indescribably 'smoother' today after the cleaning of the IAC internal plastic(?) part. Could just bee the cool weather though.
Trending Topics
Thread Starter
|
Freshman User
Joined: Apr 2002
Posts: 33
Likes: 0
IAC valve
stevie ray - thanks for the advice on the fuel pressure regulator.
When I changed my IAC valve, idle quality greatly improved, but I was still having the hard to start when warm problem. I checked my fuel pressures again and they were on the low end of the shop manual specs - the pressures did not change from key on engine off or running. I then replaced the regulator and fuel pressures increased and the truck starts and idles like the day I drove it off the lot!
When I changed my IAC valve, idle quality greatly improved, but I was still having the hard to start when warm problem. I checked my fuel pressures again and they were on the low end of the shop manual specs - the pressures did not change from key on engine off or running. I then replaced the regulator and fuel pressures increased and the truck starts and idles like the day I drove it off the lot!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
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
Elder User
Joined: Dec 2001
Posts: 578
Likes: 0
From: Massachusetts, USA
IAC valve
Hey guys I have a couple of questions on this whole IAC please bear with me as I am new to this.
1) on my 93 f150 w. 4.9 throttle body which piece is the IAC in the books it shows the V8's but not the I6?
2)Also what is the best way to clean it right??
The reason I am asking is because this weekend I did the modifications on the air intake with a K&N and a modified airbox and also a restrictor plate on the egr both these have helped out tremedously. Now the idle seems a to have kicked up a bit and from what I have read the IAC is the best bet to try first. ANy input or suggestions at all would be appreciated.
MAC
1) on my 93 f150 w. 4.9 throttle body which piece is the IAC in the books it shows the V8's but not the I6?
2)Also what is the best way to clean it right??
The reason I am asking is because this weekend I did the modifications on the air intake with a K&N and a modified airbox and also a restrictor plate on the egr both these have helped out tremedously. Now the idle seems a to have kicked up a bit and from what I have read the IAC is the best bet to try first. ANy input or suggestions at all would be appreciated.
MAC
Thread
Thread Starter
Forum
Replies
Last Post
