The Engine is not working on idling!

MatteMan · May 1, 2006

Yesterday when I went out to the car and started it, it wouldn’t start whiteout any gas, and when I let go the gas pedal the engine dies. But when I hold the gas down for like 2000rpm in 30-45 seconds the idling start to work! Then the engine and idling worked fine the rest of the day.
And today when I and my girlfriend went to her parents the car worked fine also, no problem at all. But four hours later when we should went home the same problem come up again, the car wouldn’t work at idling. I tried several time without result. It didn’t even start idling when I hold down the gas pedal at around 2000rpm as the day before for some minute this time… So the only way to come home was to gas so the engine didn’t die and use the parking brake to brake, (manual transmission) because as fast as I didn’t gas, it just died (happened 2 times on the way home.)
Then when I come home, I plug in my OBD2 device to se if there was any codes stored in the computer, but it wasn’t. I tried to start the car again and had my foot on the gas pedal for maybe 2 minutes, and then it went idling again.

Drives the car every day, and the car has never done this before.

So what can the problem be?? Is there some idling thing that has broken??

Hope you can help me with this problem!! The car is a Mustang GT 2001

Thanks,
Mattias

hotmustang331 · May 1, 2006

IAC valve...new one for about $50. That will fix the issue

the98stang · May 1, 2006

MatteMan said:
Yesterday when I went out to the car and started it, it wouldn’t start whiteout any gas, and when I let go the gas pedal the engine dies. But when I hold the gas down for like 2000rpm in 30-45 seconds the idling start to work! Then the engine and idling worked fine the rest of the day.
And today when I and my girlfriend went to her parents the car worked fine also, no problem at all. But four hours later when we should went home the same problem come up again, the car wouldn’t work at idling. I tried several time without result. It didn’t even start idling when I hold down the gas pedal at around 2000rpm as the day before for some minute this time… So the only way to come home was to gas so the engine didn’t die and use the parking brake to brake, (manual transmission) because as fast as I didn’t gas, it just died (happened 2 times on the way home.)
Then when I come home, I plug in my OBD2 device to se if there was any codes stored in the computer, but it wasn’t. I tried to start the car again and had my foot on the gas pedal for maybe 2 minutes, and then it went idling again.

Drives the car every day, and the car has never done this before.

So what can the problem be?? Is there some idling thing that has broken??

Hope you can help me with this problem!! The car is a Mustang GT 2001

Thanks,
Mattias

Check all the vac lines. Check the PCV valve. Clean the IAC. A new fuel filter might help as well.

I'm thinking it's a vac leak.

hotmustang331 · May 1, 2006

Yea cleaning the IAC would be a better idea...it just gets carbon in the valve and wont let the air go through.

MatteMan · May 1, 2006

hotmustang331 said:
Yea cleaning the IAC would be a better idea...it just gets carbon in the valve and wont let the air go through.

Okay thanks, is it: Idle Air Control Valves? But how dose it looks and where is it located? and PCV valve, where is it located?
Someone have a picture maybe..

MatteMan · May 1, 2006

Found this picture on 50resto.com Is this the IAC that I should clean up?

stroked4.6 · May 1, 2006

The IAC is bolted onto the front of the plenum. There are two 8mm bolts holding it on and it has one electrical connection going to it. By the way cleaning it is only a temporary fix it could last one day or one month your best bet is just to buy a new one.

stroked4.6 · May 1, 2006

I couldnt see your picture so here is a picture of the IAC:

MatteMan · May 1, 2006

Thank you guys!

I have now take it of and it´s realy black inside (carbon) but not easy to clean every were inside, but I clean the best I can for so long, then I think I order a new one.
How can you try if it´s working? Can you connect 12VDC directly on the pins, and se if the spring moves inside?

Thanks,
Mattias

MatteMan · May 1, 2006

Where is the PCV valve located?? Can be good to check that one out also... and what is the black "hat" on the ICA to? Nothing happens when I twist on it or pull in it.

stroked4.6 · May 1, 2006

The black hat on the top of the IAC I think is there just to make sure either not too much air goes inside or it protects a valve (screw) which sits under it but im not totally sure.

The PCV looks like a plug which goes into the valve cover. On my car its on the pass. side valve cover right in the middle. You should replace these every so often I think every 30000 miles. They are cheap only like $8.00 so it no big deal.

MatteMan · May 17, 2006

I have now changes the iac valve to a "CX1785" as it says on 50resto.com that will fit my 2001 GT, but the the design was a little different, there is no "Black hat" on it and the "chrome housing" is litle shorter. But it works fine so I hope it dosen´t mader...
I also changes the PCV valve.

Thanks,
Mattias

billfisher · May 17, 2006

MatteMan said:
Okay thanks, is it: Idle Air Control Valves? But how dose it looks and where is it located? and PCV valve, where is it located?
Someone have a picture maybe..

DOH !!!

The Engine is not working on idling!

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