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Old 11-11-2009, 05:16 AM   #1
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stalls when decelerating

hello to all
i've had a problem with stalling upon decelerating with the 2003 mach I. it was fairly intermittent. Money is a bit tight and it was suggested to me to clean the idle air control valve. I dont know if this was false hope, but the problem "seemed" to lessen after cleaning. But, now its stalling frequently when hitting the brakes and decelerating. She has aprox. 120,000 on the odo. I have taken it to a shop or three , one suggested vac leak , one wanted to start changing everything starting with the mass air sensor. NO code has shown on the dash at this point . Any and all help would be appreciated.
thank you all again for your time.
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Old 11-11-2009, 08:17 AM   #2
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Re: stalls when decelerating

MAF would typically cause more issues than just stalling on decel

A vacuum leak is possible but seeing as it's stalling more when you hit the brakes..

Try hitting the brakes when sitting at idle, see if the idle jumps around

If it does, it could be any number of things..

I'd say, as cleaning the IAC seemed to make a difference, that is the most likely cause - it could be the cleaning helped, but cleaning an IAC doesn't always fix the base problem (This may not be your case, but I've seen carbon gum up with carb cleaner, when not everything is removed it may cause issues with the IAC down the road)

That's where I would start

When braking and with the engine feeling like it's going to stall, try bumping the throttle a bit

Another thought could be the Throttle Position Sensor, but that's not as likely seeing as it only stalls if you're on the brakes
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