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Old 03-07-2011, 09:28 PM   #1
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Default 1994 F150 5.0 Cold Start - Dies after about 30 seconds and starts right up again

I recently bought a 1994 Ford F150 from its 2nd owner. The original owner was very meticulous on the maintenance. The truck is extended cab, duel fuel tanks, 5.0 L V8. When I start it cold, it fires right up with the RPM's reved up as normal. About 30 seconds into it, the RPM's die way down to almost nothing and then come back up again. Sometimes is will actually die altogether. When this happens, you can start it right back up and it is totally fine after that. Can anyone help me with any suggestions?

Thanks for the help!
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Old 03-07-2011, 09:53 PM   #2
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Originally Posted by meyersm15 View Post
I recently bought a 1994 Ford F150 from its 2nd owner. The original owner was very meticulous on the maintenance. The truck is extended cab, duel fuel tanks, 5.0 L V8. When I start it cold, it fires right up with the RPM's reved up as normal. About 30 seconds into it, the RPM's die way down to almost nothing and then come back up again. Sometimes is will actually die altogether. When this happens, you can start it right back up and it is totally fine after that. Can anyone help me with any suggestions?

Thanks for the help!

Your IAC is probably dirty -- My 92 used to cold start then die... youd have to gas it to keep it alive... this fixed things for a while but eventually youll have to pull the IAC and clean it...

someone once said 'dirt happens'...
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Old 03-07-2011, 10:44 PM   #3
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Where do I find the IAC, how do I remove it, and what is the best method for cleaning it?
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Old 03-07-2011, 11:00 PM   #4
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The IAC is bolted to the throttle body and is a round cylinder with a 2 wire connector on the end. It lets air go past the throttle body when it's closed hence the name "idle air control" valve. To test it while the truck is acting up whack the IAC with a wrench and it'll most likely clear up and idle fine. If you want to try to clean it unbolt it and spray it in some carb cleaner to break up the carbon then get it out with a small brush or Q-tip. After a few spray/scrub cycles you'll probably have it as clean as it'll get. Sometimes it's the electronic solenoid that is bad, in that case go buy a new one.
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Old 03-08-2011, 02:17 AM   #5
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The IAC is bolted to the throttle body and is a round cylinder with a 2 wire connector on the end. It lets air go past the throttle body when it's closed hence the name "idle air control" valve. To test it while the truck is acting up whack the IAC with a wrench and it'll most likely clear up and idle fine. If you want to try to clean it unbolt it and spray it in some carb cleaner to break up the carbon then get it out with a small brush or Q-tip. After a few spray/scrub cycles you'll probably have it as clean as it'll get. Sometimes it's the electronic solenoid that is bad, in that case go buy a new one.

+1 ...perfect info!!

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Old 03-08-2011, 02:17 AM
 
 
 
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