HAAAYYYYYLLLLPPP! Mustang Dies Only On Cold Starts??

1NVERTED5.0 · January 3rd, 2012, 07:18 PM

I rarely ever drive this car but lately when its been colder out, it's been stalling/stumbling bad on the first start up of the day. When it's above like 55-60 degrees, it doesn't do this. Most of the time it will just stall out after 2-3 seconds of stumbling. If you go to restart it, as soon as you turn the key it will fire up instantaneously and act normal for the rest of the day. It also runs lean (like 16.5:1 or more) for the first few minutes until it goes into closed loop. I've swapped out the ECT sensor and cleaned/swapped out IAC's to no avail. Hoping somebody can shed some light on this because im out of ideas and its annoying the hell out of me.

Mustang 5.0 stalls/stumbles - YouTube

ryanw · January 3rd, 2012, 07:58 PM

Have checked fuel pressure, ran codes, checked tps sensor volt, cleaned maff sensor

Stevo077 · January 3rd, 2012, 08:00 PM

Mine does the same, could never figure out why. Did the same as you and even swapped out my ACT sensor to no prevail.

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1NVERTED5.0 · January 3rd, 2012, 08:07 PM

Originally Posted by Stevo077

Mine does the same, could never figure out why. Did the same as you and even swapped out my ACT sensor to no prevail.

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Yeah its retarded. I dont get the whole, only when it's cold outside it does that..

Originally Posted by ryanw

Have checked fuel pressure, ran codes, checked tps sensor volt, cleaned maff sensor

Fuel pressure i haven't checked.. though it doesnt miss or act like its starving for fuel at any point. Ran codes and got code 33 and 34 for EGR stuff? Could that actually cause that?? Havent checked TPS or maf because it didnt seem like those would cause that but MAF is brand new and less than 4 months old, however i can definitely do that.

ryanw · January 3rd, 2012, 08:15 PM

If you have a k&n filter and you over oiled it, it could cause your new maff to be dirty. Not sure if any of the things i listed is your problem but i wanted to list some easy things to check

1NVERTED5.0 · January 3rd, 2012, 08:17 PM

Originally Posted by ryanw

If you have a k&n filter and you over oiled it, it could cause your new maff to be dirty. Not sure if any of the things i listed is your problem but i wanted to list some easy things to check

I appreciate it.. I have a BBK CAI that hasn't been oiled at all.

January 3rd, 2012, 07:58 PM	#2
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Have checked fuel pressure, ran codes, checked tps sensor volt, cleaned maff sensor __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

January 3rd, 2012, 08:00 PM	#3
Stevo077 Regular 1990 Mustang GT Join Date: Jun 2011 Location: NE Oklahoma Posts: 123 iTrader: 0 reviews	Mine does the same, could never figure out why. Did the same as you and even swapped out my ACT sensor to no prevail. Sent from my SCH-M828C using AutoGuide.Com Free __________________ 1990 Mustang GT

January 3rd, 2012, 08:15 PM	#5
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	If you have a k&n filter and you over oiled it, it could cause your new maff to be dirty. Not sure if any of the things i listed is your problem but i wanted to list some easy things to check __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

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