Gaspi101

OK, maybe I misunderstood. I thought it was only idling at 1800 when you cranked it up for the first time. And then, when coming to a stop, it oscillated between 400 and 1000. If you're still at 1800 rpm idle speed after about 20 minutes of the engine running, then it could be anything from the throttle butterfly misadjusted, or a faulty sensor like the temperature switch, to an air leak in your air intake system. Just troubleshoot, my man.

Don't buy parts unless you have an idea what the problem is. For example, don't go and spend $10 on the temperature switch sensor until you test it: Unplug the cable from the sensor embedded in the manifold (don't unscrew it!!), and keep the engine running. See if you hear the same oscillation of 400 to 1000 rpms then. If you do, that's the problem, get a new sensor. If the engine's tune changes, the rpms drop dramatically and the fan turns on to high, then it's not--the sensor's fine.

That's what I mean about troubleshooting. Do similar tests for air intake system, throttle body, throttle cable, etc. Use your imagination. You'll get it.

Cheers,
Gaspar

striker1001

My mustang is automatic, when its in park or especially when i put it into drive and let off the brakes, it idles rough, could this be due to the IAC as well.

Smooth_J

For furture reference, here is the picture of the IAC: (not my engine bay :P)



[IMG]local://upfiles/14091/7776DAFD3EC744F1A81A1EE225171DE2.jpg[/IMG]

CRAY0971

I was having this problem with the stalling and it turned out to be a dirty crank sensor. I had a Steeda timing adv. sprocket which has the crank sensor reading on the outside of the crank pulley all I had to do is clean off the sensor and put it back where it was meant to go. So for all of you that looked at the IAC noe look at your crank sensor

Curtis

99smokingt

any body have a part number on the iac for a 99 gt cause i hate dealing with the dumb a$$es at the parts store

CRAY0971

hey now I take offence to that remark (dumb a$$es at the parts store) that's me sorry just not a ford store

Gaspi101

Want to prove parts store people are not generally a$$holes, give the man his part number...

Chris06

ok here's one for you guys hopefully you can help. i was driving my car the other night and it died on me so i put it in park and start it back up. well i drive a little longer and the car dies under braking going to a stop sign. this was saturday and since then the car hasnt started again. i've changed the fuel pump because we could not here it running when we turn the car to the on position. i've also changed the CCRM in the front fender. $300 in parts and still no where on the car. i've had the stalling problems for a couple of months never thought to check the IAC but now im not sure if that is even the problem considering the car will not fire at all. just wondering if you guys might have any idea what the problem might be. by the way i've checked the shut off switch in the trunk and checked the fuses as well.

CRAY0971

Well like I said I am not at a ford store, I am with a subaru dealership but I do drive a 00GT but to please you F8VZ9F715AB list price $100.30

Gaspi101

Awesome, CRAY. You've just disproven the common belief that you have to be a dick to be a parts store guy. I guess the lesson learned is that if you have to buy a part, get a Subaru!!! LOL.

As for the price, it's about $30 at AutoZone or Discount Auto Parts. Before you replace it, do as we said countless times on this thread: Flush it with carb cleaner and WD 40. Clean it well first, before you spend money on another IAC.