Engine 2001 Mustang Bullitt Starting Problem

Netiis

Member
Oct 27, 2019
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North Carolina
Recently I bought an 01 Bullitt as a project car and it has roughly 233k miles on it. I’ve ran into a problem where when I try to start the car I have to get it a little bit of gas and it’ll start running, but as soon as i let off the gas it just dies out. I’ve been told that it could either be the Air Control Valve or the Air Flow Sensor. So I was going to replace them but the engine bay is somewhat dusty and this is my first actual car that I’m working on so could anyone of you point in the direction of where it’s located so I can get it switched out?
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wmburns

SN Certified Technician
Aug 14, 2009
5,842
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Just wondering. Are you interested in learning HOW to fix your own car? Or are you just interested in "parts changing" into a possible solution?

If looking for how to fix your car, then TEST to see if the IAC has what it needs to work? For example key on +12 volts at the IAC? Or testing to see that the PCM is actually in control the IAC before replacing what may be a good IAC. One way to test is to use a test light across the IAC. A working IAC should vary the brightness of the test light as the PCM opens/closes the IAC.

Or use an ODB2 scanner to compare the voltage as reported by the PCM to what is actually measured across the IAC.

If just looking to change the IAC without testing, the IAC can be found at the end of the tube with the square box.

Here's some information to get started on trouble shooting like a pro.

Troubleshoot IAC idle problems 1996-2004

ForScan ODB2 scanner w ELM327 USB

1996+ Crank with no start check list
 
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Netiis

Member
Oct 27, 2019
2
2
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20
North Carolina
Just wondering. Are you interested in learning HOW to fix your own car? Or are you just interested in "parts changing" into a possible solution?
I was looking into just fixing this problem for the time being and then afterwards move on to more advanced stuff. But thank you for the quick response!
 
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Onesick99GT

Active Member
Nov 20, 2018
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@Netiis Did the person who told you what the problem could be do any dataloging? I assume they are just giving you their opinion of what could be wrong. Just to let you know without dataloging you will be chasing your tail replacing parts without knowing what the actual issue is. So if you have lots of money to waste start replacing everything people tell you to replace. Maybe you might hit that needle in the haystack by luck. The issue your having can be alot of different issues. Anything that is related to spark, fuel, and air, which is almost every componant on your car. There is only two ways to identify your issue. Take it to a mechanic which will datalog it to find the issue or datalog it yourself. Option 3 start throwing money and parts at it.
 

Onesick99GT

Active Member
Nov 20, 2018
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Dayton, Ohio
And if this was my project car, with that many miles, I'd replace all spark plugs, coils, injectors, oxygen sensors and give it a good oil change. Then go from there diagnosing any issues you may have. But that's just me.