Ford Quick Tips #63: Crank No Start Idle Air Control Valve Diagnostics

This kit includes the noid light needed for diagnostics-
My Company BSG Automotive offers Auto Repair services in the greater Chicagoland area.
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The information, demonstration and any content contained in this video is for informational purposes only. The user and BSG Automotive (hereinafter “FordTechMakuloco”) makes no warranty, express or implied, regarding the effectiveness or safety of the contents of this video. In no way should the contents of the video, including the tools used, be repeated or tried by anyone. Viewers should only seek the help of a trained professional located at a licensed auto repair shop for any fix, modification, alteration, or any change to their vehicle. FordTechMakuloco shall not be liable for any injury, damage, or loss to any person or property that may result from use of the tools, equipment, or any content contained in this video. In addition, there is no way to guarantee that the video is not altered or modified or is not in the final form submitted by FordTechMakuloco and therefore, FordTechMakuloco does not warrant that the video is unaltered or not modified. The links on this video to products are for informational purposes only and in no way are an endorsement of the safety or effectiveness of the particular product. Viewers understand that anything contained in this video or linked to or from this video is the sole responsibility of the viewer and in no way provides an express or implied warranty as to the safety or effectiveness of any linked tool, product, or video. Therefore, viewer agrees to release, waive, and discharge FordTechMakuloco or anyone affiliated with FordTechMakuloco, from any and all liability, claims, demands, actions, and causes of action whatsoever arising out of or related to any loss, damage, or injury, including death, that may be sustained by the viewer, or to any property belonging to viewer, regardless of whether the loss is linked to the use of the contents of this video, or otherwise and regardless of whether such liability arises in tort, contract, strict liability, or otherwise, to the fullest extent allowed by law.

[billyjackalvarez]

You are the man...no one will ever under stand how much you have tought me...i saved my buddies 5.4 3 valve after doing timing chain guides and tensioners with the help of you and the walk through you do on everything is awesome...id like to shake your hand one day

[ljackson]

You should absolutely support this channel. Send him a thanks. If you want to rent it because you are trying to figure out the crank, but no start, Oreilly's has a rental.

[kpjimmy]

I had looked at numerous vids here and yours have been the most helpful! First thanks! I mean when you explained many of the symptoms like coasting, it was exactly my issue. I first tried cleaning it with carb/TB cleaner and didn't work after a good warm up of the engine. I was still having starting with idle issues when the car is warmed up after 5-10 mins. After going to my local car shop and buying a new IAC, the auto in question, a 2003 F150 with about 166k miles on it started right up and did the same test after 5-10 minutes and also drove it around a bit to make sure the idle wasn't traveling while coasting and turning. And alas, the replacement worked! Thanks again!

[murphytoadster]

Good explanation that made me connect the dots.
"Coast down" only YouTube guy that pointed that important detail.

[romansoldier]

Got a 2006 f150 for free from a guy in alaska. Did a phaser, chain, guide, and tensioner kit. Ran great then did exactly this. THANK YOU SO MUCH. this thing runs perfect now. Free99 babyyyy lol

[djahnsen]

My compliments on well done many YouTube poster's start out these videos with obnoxious music or seem infatuated with their own voices and face for minutes before getting to the point if they ever do at all. I wish it were that people like yourself were awarded for quality/content and the dopes were screened or never allowed to post their videos to begin

[steveo]

Glad you commented about the fact that the IAC moves very little. I was told a test you can do is remove the IAC while still plugged in. And then turn the key to the on position. The car will ready for start up by opening the IAC wide open. Likewise you can unplug it and the IAC should fully close. I tried it on my 2000 ranger and I don’t notice much of a difference. Even put on another one with similar results. But if what you are saying is true I may not have noticed the small movement change made.

[robertmitchum]

A couple of raps with a wrench on the IAC valve will usually fix a stuck one due to carbon build up or just plain wear. Of course you should replace it ASAP.

[hawaiianf]

You are the best mechanic I've ever met. Awesome "Now You Know How" vehicle help and tips and tricks for Ford vehicles that all of us DIYers really need. Thanks!

[SiguysGaming]

You did an excellent job on this video. you saved me from just going out and buying a new iac

[ricardogarcia]

Thank you sir!!! my truck was driving me nuts 😫😫 thanks to your video and I know what it is.

[brad]

Helped me solve and isolate my IAC issue. Thank you

[alanw]

Another great trick.. Can you answer the debate some of us have been having about the older Ford egr valves, ei, 2001 Ranger 4.0l. When smoke testing the intake, the egr's tend to leak alittle smoke out the bottom, some info says theyre supposed to, some guys say no, and back and forth we go. I've seen the same argument numerous times. If you could settle the debate since you seem to be the definite Ford guy to go to. Thanks much

[Australia-kykx]

Professional quality video. Informative and encouraging. Thanks for posting.

[angelcintron]

That's some great information. Thank you so much for sharing this..!

[thebrain]

So the purpose of the razor blade test is to see if the car starts and if it starts and runs good, you know that you have a bad IAC correct?

[justagoodoldtexasboy]

My 03 Ford Ranger Revs high at about 2000 - 2500 RPM when I start it up and wait for it to warm up in the morning. Could it be my IAC Valve or something else? Thanks!

[miguelmendezgarcia]

Great information, thanks for posting this kind of videos, I do have a question, I tried the noid light and is not lighting up, I do have power so I'm assuming no grond, what can I look for?

[gusorviston]

How does the ECM know to open/close the IAC? Does it use rpm information to taper it on/ off ?

Note. I am building a little jeep and making a ford 2.3l carb into an efi engine. Working on a starting but not sure what my ecm is thinking

[rickkeller]

I have a '94 Mark VIII 4.6 in my '55 TBird. It idles fine but if I blip the throttle or when I come to a stop with the clutch disengaged the idle is around 1600 rpm for 5 or 6 seconds before it drops to 700. I recently swapped a spare (used) IAC and it was little worse, hanging at 2000 rpm for 5-6 seconds before returning to normal. When I first drove the car several years ago I assumed the high idle was due to the ECU looking for the 4R70W transmission. But I noticed when the cooling fan comes on at idle the engine nearly dies. It wasn't clear to me what you are checking by starting the car with the razor blades holding the throttle open slightly. I watch your videos and have learned quite a bit, thanks for doing what you do.