Car Fix DIY Videos

Carlos Medina says:

what if my truck is doing the same but is a 6.0 l turbo Diesel f250 2004 i
unplugged the IAC en the high rev’g continues what else you think it may be
?

Bonny Scott says:

I’ve got a 2009 e250 5.4liter. With a similar high idle issue. It is
throwing a code. I’m going to run through the same checks and see what I
come up with. Thanks you gave me a few good points.

briansmobile1 says:

@MisterMattyMo It was the maximum air flow that hose would allow. The
throttle butterfly was closed so the remaining air was going through that
hose unrestricted.

briansmobile1 says:

@1hondaluver It SHOULD smell like that when it’s in Open Loop and not
warmed up yet. If you get off the highway and it smells like that then it’s
a problem. Hope this helps.

contagiousFX says:

@1hondaluver if you still got a rich smell even after closed loop your
catalytic converter could be deteriorated inside. You can use a rubber
mallet and lightly tap it and if you hear rattles inside that’s your
culprit, otherwise you gotta open them open and look inside of the cat.
Also, get a scan tool that can read live data and make sure you car is in
Fuel Control. Look at your LTFT and STFT. Make sure the numbers are between
0 to +7, if it’s high try cleaning the MAF sensor.

MoneyMarcMes says:

So how did you fix the problem??? it wasn’t clear how you solved teh
problem. If it was a stuck IAC then just replace it.

briansmobile1 says:

@beefystik You bet man. I’m glad you’re liking them. ; )

MisterMattyMo says:

So it WAS the IAC valve? I don’t understand why it stayed high RPM until
you pinched the hose. It’s not like a high airflow was still going through
it.

trjonez says:

I might add,…the reason Ford opens the IAC Valve when the throttle is
opened and RPM is increased (which is contrary to what you’d normally
think), is that the instant the throttle is released,..hydrocarbons
(unburned fuel) spike very high. All auto manufacturers strive to protect
their expensive catalytic converter. One way to do that is to eliminate the
sudden closed throttle hydrocarbon increase by decreasing the RPM drop more
slowly, which also lessens the chance of a return to idle stall.

briansmobile1 says:

@deion712 The air volume going through was holding the weak IAC motor from
pulling the pintle back into the appropriate position from wide open. When
you drive it opens up to ease the RPM’s back down to be smooth and save
fuel. The air rushing by was holding it from returning.

Barry Sexton says:

Hi Brian. You have some great videos. I have a 1999 F250 SD 5.4l with 183k
miles. It runs great but has a very strong smelling exhaust. It always
smells like it is running very rich. At idle, you can really smell it
coming out of the tail pipe. I can’t see any smoke, there is no check
engine light. I even checked for old codes, but no codes at all. Again, it
runs really good so I don’t know what this would be. Any suggestions?

briansmobile1 says:

If you do the testing I described one can be sure.

de max says:

Thanks for the video, nicely explained. I didn’t quite catch the exact
location or image of the IAC – a pointer would have been great. Also is the
IAC solenoid built-in ? or attached ? Were is the IAC control ckt ? which
is one of the possible problem under P0507 the trouble code. And the Air
intake after the Throttle body ? also mentioned under P0507 You helped an
awful lot, but mentioning the other (3) possibilities would have made this
video truly educational. The Ford Manual is TSB 03-3-5

briansmobile1 says:

Perfection robs creation. A quick video on a topic is better than no video
on that same topic. I can always make a response with more detail later.