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  #1  
Old 08-01-2009, 11:12 AM
RobbyMartin RobbyMartin is offline
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My truck starts and then immediately stalls

If I don't keep in the throttle immediately after start up it will stall a lot of the time. It doesn't do this everytime or if it sits for a while but if I drive it and then stop off at a store or something and then go to start it back up it gives me this problem. I notice it idles about 3-4k RPM's when I stop at a light or something too. Anyone have any insight?
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Old 08-01-2009, 02:00 PM
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Sounds like the IAC (Idle Air Control) is bad.
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Old 08-01-2009, 02:17 PM
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Sounds like the IAC (Idle Air Control) is bad.
That's about $150 for a new one, right? Wouldn't that throw a code?
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Old 08-01-2009, 02:32 PM
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No it doesn't throw a code. You could try cleaning it some people have luck with that some don't. Search the site you'll find something on it. Def sounds like the IAT though.
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Old 08-01-2009, 02:38 PM
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That sounds a bit high. You might get lucky and it will work right after removing it and cleaning the guts with brake parts cleaner.
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Old 08-11-2009, 11:47 PM
RobbyMartin RobbyMartin is offline
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I still have the same issue BUT now it stalls occasionally while driving when coming to a stop. Then when I turn the key to start it back up, the instrument panel guages "peg" themselves for a second and then back to zero before I can crank it. Also, occassional while idling, the guages pulsate or jump back and forth. Is this something that could involve the Idle Air Control Valve? Is it an electric problem? I need help before I start blowing money on parts.
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Old 08-12-2009, 06:30 AM
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What have you done so far? Did you change the IAC?
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Old 08-15-2009, 05:18 PM
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What have you done so far? Did you change the IAC?
I took off the AIC and cleaned it with brake parts cleaner and re-installed it and now it runs rougher and idles at 3000-5000 RPM's or it just stalls. Then I unplugged the connector while the truck was running and it made no difference in the idle speed whatsoever....so my conclusion is that the part is bad. Would you all agree with that?
Also, in the last 4-5 days when getting off the freeway after 30-40 minutes of driving, my truck would stall at the end of the off ramp everytime. Then when I restart the truck, all my radio presets were erased and I had to reset them. Could these problems be related?
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Old 08-16-2009, 01:18 PM
RobbyMartin RobbyMartin is offline
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I still need help guys!!
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Old 08-17-2009, 08:23 AM
RobbyMartin RobbyMartin is offline
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OK, I checked on the price of a new IAC and it's between $100-150. It is very specific for the 4.6 for 2002 for some reason.

A friend suggested it could be a vacuum leak too and said to spray starter fluid on the vacuum lines and if the RPM's rose up then you found your leak. Sounds logical but I'm no mechanic so would any of you guys agree with the starter fluid theory?

Also, if you guys could point me to a place where I can possibly get a new IAC for a 2002 4.6L (not 5.4L), for a reasonable price, I would greatly appreciate it.

Thanks
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Old 08-17-2009, 08:23 AM
 
 
 
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