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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-18-2007
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Engine dies when cold

I have a '91 Aerostar with a 4.0L engine that dies at stops while it's cold. I have cleaned the throttle plate body and cleaned the MAPP sensor but it didn't fix it.

Does anyone have any suggestions for a fix?
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Old 12-18-2007
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I'd clean or replace the IAC valve next. It's a typical failure on fords.
Often times idle is inconsistant, fast, slow, or the motor dies if your not pushing the gas. Motor runs smooth otherwise.

Rich
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Old 12-18-2007
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Where is the IAC on the 4.0L?
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Old 12-18-2007
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It should be right behind the Throttle body on the driver side.

Last edited by GearBoxKevin; 12-19-2007 at 11:17 AM.
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Old 12-20-2007
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Ok, pulled the IAC and cleaned it with carb cleaner spray. It did help it so I will pull it off again and try to get all the carbon off the valve and seat. I figure if I can get it real clean it will be like new. Nothing to loose and money to gain if I can get it really clean.

Thanks for the info.
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Old 12-20-2007
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No problem.

I've personally cleaned them and still would not work much better. Wound up replacing it and then the motor ran perfectly. (94 T-Bird)

Ever since then I keep mine as clean as a whistle. Usually pull it off every 10k miles and give them a little spray. No problems when I do that. (all my fords)

Rich
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Old 12-20-2007
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Yes, letting the carbon built up to long is a bad move.

I pulled it off just now and removed the solinoid coil and the oring and used carb spray and a pipe cleaner to clean it more. I rolled the pipe cleaner around the valve seat area and got a lot of carbon out. Blew it out and assembled and installed and test drove and it is almost perfect now with a slight hesitation.

My wifey decided we have to go somewhere at 3 PM so I will take it off, tear it down tomorrow and soak it in some real carb. cleaner I have. It's some powerfull stuff and will eat the carbon out. I think I can save this IAC.

I think I will look at my lil' Ranger's IAC and clean it out. It has about 62K on it and may be carboned some.
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Old 12-21-2007
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Glad to hear it's something simple and cheap. That's usually not the case in life.
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Old 12-21-2007
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Ok, just got it cleaned up and back together. There is two chambers in the IAC on the '91 and I cleaned both in the carb cleaner for about 3 hours. Flushed with water and then used the spray carb cleaner to flush everything. Put it back to gether and now the engine has a slight hesatation but don't die at take off from stop but the temp is only about 45 degF so I will wait for colder days.

Since this a back up vehicle I'll probably leave it alone but if it was my main ride I would replace the valve since as others have said, just replace it. Cleaning one that is already giving trouble will not solve the problem.
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