Harv524

I have an 03 GT, recently it has been stalling whenever I slow down such as at a red light and turning. The car idles fine, cranks correctly, and drives perfectly normal. Just when I slow down on a highway or whatnot, it just shuts off as though I turned the key. I checked under the hood and the battery had the blueish corrosive all over the terminals, positive more so than the negative. I disconnected them and cleaned it up with a brass wire brush. Reconnected them and everything was fine, initially. I made abrupt stops on my way to work this morning to see if it would do it. It didn't at first, but as soon as I got in the parking lot and slowed to park it died on me. None of the dash lights come on, except for the battery light. The charge indicator shows it's fine, and it starts fine. Any ideas?

jwog666

check your air inlet connections after the MAF sensor, if the connections are loose this can cause a stall, otherwise a dirty IAC can cause your concern, replace or clean it.

Harv524

I'll have to check into it when I get home. Thanks

Harv524

Checked the inlet connections and they were all tight. Removed the IAC and it was very dirty, cleaned it with TB cleaner and Q tips and got it all clean again. Reinstalled the IAC and the problem persists.

Harv524

Looks like I'm just going to buy a new IAC.

Harv524

Hopefully someone will respond again, lol. I replaced the IAC and fixed the issue of it dying when decelerating. However, now the issue is it'll start and idle fine for a bit but it would eventually die when stopped. I left the battery unplugged over night and the issue seems to be resolved. After cranking it this morning and driving it around a hair before leaving, it would idle high around 1k before dropping to 500, when it would drop though the rpms would bounce a bit before stabilizing. Could it just be the computer adapting to the new amount of air flow? Or does the maf need to be cleaned?
Also, on my way to work I realized that it's still dying after I stop for a bit, and when rolling in gear the Idle sits at 1500 and sped me up to 20mph. There aren't any vacuum leaks, checked everything yesterday.

Harv524

Replaced the TPS and IAC, also removed and cleaned out the TB and Plenum with TB cleaner. Still having the same issue. Could it be the EGR? Someone please reply back.

jwog666

its come to the point where you need to get a scan tool and monitor engine data and see what is changing to cause the stall, you have taken care of the usual suspects, but now you need to have somebody physically look at it, you are just guessing at this point, and guessing costs alot of money in parts