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Old 04-28-2014, 04:25 PM   #1
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Dangerous issue while driving 03 GT

My girlfriend was driving her 03 GT last night and while down shifting from 5th to exit the interstate, her power steering and brakes went out and the diagnostic lights on the dash all came on. It sounds to me like the engine shut off, but I wasn't there to confirm. She said she coasted to the shoulder, restarted the engine and there was no issue after that (she took it easy the rest of the way home and isn't going to drive it until we can get it looked at). What could have caused something like this?
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Old 04-28-2014, 04:40 PM   #2
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Wow that's pretty scary man. If the car shut off I think it may be an ECU problem.. Is there a check engine light on now? Even if there isn't I will take it out see a local auto parts store and have them put the computer on it and read it and it will be able to tell you if your ECU is bad. I've worked at many dealerships and I've seen cars come in that shut off due to bad you see you definitely get it checked out man cause that's pretty scary if he could happen at anytime.
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Old 04-28-2014, 04:40 PM   #3
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Sounds like the motor shut off like you said like maybe she stalled it some how
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Old 04-28-2014, 04:50 PM   #4
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That sounds like the obvious answer, but I'm confident in her ability to handle her car and don't think she stalled it. Of course it's still entirely possible, but I'd like to know if there's something I can have a mechanic look at before it gets back on the road, as neither of us are that knowledgeable about auto mechanics.
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Old 04-28-2014, 04:52 PM   #5
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if it happens again . don't coast because if the car is off and you turn the steering wheel, wont it lock? then uh oh!
Put it in neutral, push in the clutch and start it back up
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Old 04-28-2014, 04:53 PM   #6
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Wow that's pretty scary man. If the car shut off I think it may be an ECU problem.. Is there a check engine light on now? Even if there isn't I will take it out see a local auto parts store and have them put the computer on it and read it and it will be able to tell you if your ECU is bad. I've worked at many dealerships and I've seen cars come in that shut off due to bad you see you definitely get it checked out man cause that's pretty scary if he could happen at anytime.
Thanks, I will do that. The check engine light is not on, it only happened during the incident (also the battery, oil, etc lights too).
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Old 04-28-2014, 05:04 PM   #7
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The engine definitely stalled, but why?
Does the car seem like it idles good, with no surging, hanging idle, etc.?
This is probably going to be a wait and see game, so I recommend instructing your girlfriend to just put the car in gear and let the clutch back out if this happens again. The engine will most likely restart and the power will be restored to the accessories. Everything will still work when the engine is off, but there will be no power assist.

Depending on the miles on the car, my suspicion is a problem with the Idle Air Control valve...
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Old 04-28-2014, 06:56 PM   #8
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My guess would be the IAC valve. I've experienced the same issue while clutching in after driving in 5th for a while. But I just start it right back up and keep driving. I bet you if she watches the RPMs if it happens again she'll see the engine drop to 500 and then pick up a little bit before just completely shutting off.
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Old 04-29-2014, 10:18 AM   #9
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I looked into problems the IAC valve can cause that seems like the issue here. Would you guys say the car is safe enough to drive until I can get a new one (in a day or two hopefully).
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Old 04-29-2014, 10:59 AM   #10
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I looked into problems the IAC valve can cause that seems like the issue here. Would you guys say the car is safe enough to drive until I can get a new one (in a day or two hopefully).
yes, just be cautious
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Old 04-29-2014, 11:13 AM   #11
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Dangerous issue while driving 03 GT

Mine would do that so until I could buy a new aic I had to keep a little gas on at stops and when shifting
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Old 05-01-2014, 11:43 AM   #12
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I'm trying to buy a new IAC valve but the internet is telling me there are two different ones that both fit. one looks like this http://i.imgur.com/amW8DA9.jpg , and the other looks like this http://i.imgur.com/7Z66juO.jpg with the hose connector.

i can't imagine that extra part is superflous. which do i need?
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Old 05-01-2014, 11:59 AM   #13
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Yes. It's the second one.
Go to Rockauto.com. It's less confusing. Get only a Hitachi or Motorcraft.
If you give me a few moments, I have a discount code for Rockauto...
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Old 05-01-2014, 12:13 PM   #14
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Doesn't look like they have hitachi ones with the hose connector at Rockauto. What about duralast brand from autozone? probably going to need to go there anyway, and could get it off the shelf.
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Old 05-01-2014, 12:19 PM   #15
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Old 05-01-2014, 12:30 PM   #16
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Doesn't look like they have hitachi ones with the hose connector at Rockauto. What about duralast brand from autozone? probably going to need to go there anyway, and could get it off the shelf.
Rockauto has Hitachi. Part# ABV0003. $36.79.

Ive heard of people having problems with Duralast. If you go to AutoZone have them get you a Hitachi or the much more expensive Motorcraft.
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Old 05-01-2014, 12:36 PM   #17
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The hitachi ABV0003 is missing the hose connector, isnt it?

https://www.google.com/search?q=hita...&bih=667&dpr=1
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Old 05-01-2014, 12:47 PM   #18
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The hitachi ABV0003 is missing the hose connector, isnt it?

https://www.google.com/search?q=hita...&bih=667&dpr=1
It sure as hell is in those pics. Lol.
Go look at your gf's to see what it looks like. You need that hose connector. They may have submitted the wrong picture to all of the retailers. In this case, I would go to a local auto parts store so that you're not waiting around for, potentially, the wrong part. Ask for Hitachi and see what comes up on their computer.
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Old 05-01-2014, 01:00 PM   #19
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Yeah I'm gonna try and handle it tonight and just get a part off the shelf. Thanks for the help though!
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