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Questions tagged [iac-valve]

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1 vote
2 answers
262 views

RPMs increase to 3000 after shifting into neutral

When I shift into neutral in my 2004 2.0L manual Ford Escape, the RPMs hover at where they were at when I was in gear, and then increase/hold at ~3000 RPMs for about 5 seconds before decreasing. I ...
sandeman_13's user avatar
0 votes
1 answer
357 views

When braking RPM drops and radio cuts off (Sometimes when rolling down the window same happens)

I have a 2002 Honda Civic, it has been working great for many years until now. I have been having strange things happen: When I apply the brakes or roll down the window the RPM drops and my radio cuts ...
MarkZ's user avatar
  • 1
1 vote
0 answers
55 views

Low power when starting up Toyota Avalon

My buddy owns a 2002 Toyota Avalon. When he starts it up it barely holds RPMs, and he has to give it gas when it starts up. Linked video https://youtu.be/XTiK5BFFXKg He thinks it might be the idle ...
user1428649's user avatar
0 votes
0 answers
467 views

Replaced Idle Air Control Vavle (IACV) and Still Stalling

2004 Ford Taurus SES, DOHC 24V Car stalls at stop lights ~once every 3 days. Throttle body cleaned out ($150) - no difference. Replaced IACV with Motor Craft OEM ($80). No stalling for 5 days but ...
P.S.'s user avatar
  • 471
8 votes
1 answer
3k views

Rough idle only under load

I'm going to describe the symptoms with a very short history, some preliminary theories ( based on past work I've done on this car ), the data I've gathered and what, if any, conclusions I might draw ...
Robert S. Barnes's user avatar
2 votes
1 answer
4k views

Procedure for throttle body and idle air control replacement (ford ranger)

I'll be replacing the throttle body in my 2004 Ford Ranger (engine v6 3.0L vin-U, mileage ~ 130000) as the result of my previous post (see here Is hot desert weather the source of my recurring car ...
Z W's user avatar
  • 225
8 votes
2 answers
3k views

What is the point of heating the IAC Valve?

I recently added a cold air intake and cleaned the throttle body and IAC valve (I was having hunting idle issues) on my '01 Accord V6, and I noticed that there were coolant lines running through the ...
tmac1's user avatar
  • 115
4 votes
1 answer
1k views

Honda Hornet engine stalls

I have a Honda Hornet (CB600F) PC41 from 2007. It's the first model with EFI. The bike has an error that we can detect by observing the blinking pattern of the FI light: 2 long and 9 short flashes. ...
Tiago Alves's user avatar
9 votes
3 answers
39k views

Why Does Coolant Flow Through the IAC and Throttle Body

On many engines I've seen coolant is circulated through the Idle Air Control valve and the throttle body. One such example is the Mazda 2L 4 cylinder FS used in the 626. The IAC is ECU controlled, ...
Robert S. Barnes's user avatar
9 votes
1 answer
202 views

IAC valve cycling eratically

I have a 2004 Freestar with 240000 kilometers on it. I have had problem with the engine surging at about 1100 rpm or high idle. No check engine code is logged, I put it on a Ford computer and there ...
Dave Hodgson's user avatar
6 votes
1 answer
365 views

Where is IAC valve on 2003 Ford Ranger 6 cylinder?

I'm working in my grandson's car. His idle goes up and down with the A/C off. I can't figure out where the IAC is. He just bought it and we don't have manuals or diagrams yet. Can someone help me ...
user14094's user avatar
10 votes
1 answer
263 views

How to Tell if an IAC needs to be Cleaned?

Is it possible to diagnose an IAC as needing cleaning without actually taking it apart? For example, I recently was having some idle issues with my 99 Nissan Almera 1.6L which were solved by ...
Robert S. Barnes's user avatar
8 votes
2 answers
10k views

Is it healthy to drive with a bad IAC? [closed]

My IAC is bad and in order to keep my car running while a stop sign/light is to have one foot on the brake and one foot on the gas. Is this an effective fix to travel until I get it fixed? Or ...
Kenny Hawkins's user avatar
10 votes
2 answers
1k views

Why Have More Than One IAC Type Device On an Engine?

I've had two Mazda's, a 97 323 and 98 626. On both these car's engines there was only a single IAC mounted on top of the throttle body, and no other device for adding air flow on the intake side. ...
Robert S. Barnes's user avatar