engine shut off while driving?

BlackStang03

New Member

Mar 26, 2010

204

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Ohio

Apr 6, 2010

#1

• Apr 6, 2010

• #1

This is a 2003 4.6L

Today while I was coming to a stop, when i pushed the clutch in, the car ideled real low (500RPM) then shot up to about 1k RPM then died....it did this 3 times total, all while coming to a stop with the clutch pushed in. I have also noticed while I am driving at a steady speed the car feels like I am punching the gas pedal sometimes, when I am not....And then finally I dunno if this has anything to do with it but sometimes when i go to start it, it will turnover for about 3 seconds, in which I normally punch the gas pedal and then it fires up. What could be the issue? I was thinking maybe an issue with the TPS, and it just turned over 57k miles today.

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Apr 6, 2010

#2

• Apr 6, 2010

• #2

Bad IAC. The clue is that it starts better when the pedal is held open.

See Post #3:
http://www.stangnet.com/mustang-forums/810729-starts-but-dies-idle-help.html

 

trombonedemon

Well-Known Member

Jun 25, 2009

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Apr 6, 2010

#3

• Apr 6, 2010

• #3

Not the Throttle Positioning sensor, when a TPS normally goes bad there is a drop in RMPs at wide open throttle, e.g. 5,000 then drops to 2000 all of a sudden w/the pedal pushed alway the way in then goes back to 5000. http://www.buzzle.com/articles/symptoms-of-a-bad-throttle-position-sensor.html

 

BlackStang03

New Member

Mar 26, 2010

204

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Ohio

Apr 6, 2010

#4

• Apr 6, 2010

• #4

trombonedemon said:

Not the Throttle Positioning sensor, when a TPS normally goes bad there is a drop in RMPs at wide open throttle, e.g. 5,000 then drops to 2000 all of a sudden w/the pedal pushed alway the way in then goes back to 5000. Symptoms of a Bad Throttle Position Sensor

Click to expand...

at WOT it feels fine...I have only saw the issue when stopping (pushing in the clutch) and also while at a stop..it lowers the RPM's, surges up and then seems to stall...


Can I get an IAC or TPS at a local parts store like autozone or advanced? or would I need one from the stealership?

 

trombonedemon

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Jun 25, 2009

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Apr 6, 2010

#5

• Apr 6, 2010

• #5

You can order an IAC at any autoparts store, even if thats not the problem thats a part that will go bad, so it maybe needed changing anyway. Make sure all of your vacum hoses are properly sealed, you can use a butane lighter to check for leaks and listen for RPMs increasing.

 

BlackStang03

New Member

Mar 26, 2010

204

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Ohio

Apr 6, 2010

#6

• Apr 6, 2010

• #6

I checked all the hoses I could find. I didnt see anything that was loose/not plugged in, that was the very first thing I checked as I have had issues with vacuum hoses causing some weird issues on other cars.

I think researching it sounds like an IAC or TPS, and seems like the mustang is kind of known for issues with both....I might go ahead and pick them both up...

 

mazen189

Member

Jul 31, 2007

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I.E. southern california

Apr 6, 2010

#7

• Apr 6, 2010

• #7

this was happening to me two weeks back. its your IAC. Most certainly.

 

M

mr-mike

New Member

Jul 9, 2006

122

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Apr 7, 2010

#8

• Apr 7, 2010

• #8

I wouldnt run out & buy parts it may be just some bad gas or a vacum leak check all the hose clamps & even put a new gas filter if there is no code it could nothing but bad gas try sticking to newer gas stations that do a good buisness ......check that gas filter when its off try & remove it gently & drain it to see what was in the filter mud water ?

 

SteedaGT9150

Advanced Member

Nov 10, 2004

1,351

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68

Maryland

Apr 7, 2010

#9

• Apr 7, 2010

• #9

sounds like an IAC problem.

 

flstang65

10 Year Member

Dec 6, 2007

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SE Georgia

Apr 7, 2010

#10

• Apr 7, 2010

• #10

Sounds like IAC to me.

 

BlackStang03

New Member

Mar 26, 2010

204

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Ohio

Apr 9, 2010

#11

• Apr 9, 2010

• #11

I ended up cleaning the IAC, and I also noticed with the new intake the hose was a little too loose going to the IAC so I ended up putting a zip tie around it to tighten it....I dont drive the car a whole lot so I guess only time will tell if that was the problem or not.