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Old 01-27-2012, 11:53 AM
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Won't run cold

I have a '96 F-350 4x4 with 370K miles and it will not run properly when the engine is cold.

After initial starting, it will idle fine. However, if I do not let it warm up for about 10 minutes or so (depending on the outside temp), it will start to bog down and lose power from second gear on - the colder the engine, the earlier the gear it will start to bog.

It starts out fine, but generally will suddenly start slowing down in speed somewhere above 30 mph, and the engine RPMs will slow down. If I apply more throttle, it will bog, puff white smoke from the exhaust, lose speed and RPMs faster, and likely stop running. If it does not stop running and I pull over, it runs as though only firing on some of the cylinders. If it dies, it is very difficult to start and will run very rough until it warms up.

Any ideas?
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Old 01-29-2012, 10:42 AM
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Yeah, well it has me stumped too!
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Old 01-29-2012, 12:20 PM
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You use fuel treatment?
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Old 01-29-2012, 05:20 PM
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Quote:
Originally Posted by DonF350 View Post
You use fuel treatment?
I do not use fuel treatment. The problem only occurs when the engine in cold, otherwise the truck runs awesome and gets near 20 mpg.
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Old 01-29-2012, 05:34 PM
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Unplug the EBPV and see if that fixes it.
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Old 01-30-2012, 04:59 AM
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Does it have that problem when you have it plugged in
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Old 01-30-2012, 06:04 AM
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unplug the Ebpv and check your valve cover wiring harnesses and make sure one isn't loose. Will it eventually idle perfectly?
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Old 02-02-2012, 10:31 AM
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Quote:
Originally Posted by jesilvas View Post
Unplug the EBPV and see if that fixes it.
This did not fix it.

Quote:
Originally Posted by DonF350 View Post
Does it have that problem when you have it plugged in
No. If it the block is warm (either by keeping it plugged in, or by previous running) the problem does not occur.

Quote:
Originally Posted by elrojo63 View Post
unplug the Ebpv and check your valve cover wiring harnesses and make sure one isn't loose. Will it eventually idle perfectly?
All of the connections seem fine. It idles perfectly upon start up, or if the block is already warm. The problem only occurs when I attempt to drive when the block is cold.
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Old 02-06-2012, 01:03 PM
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Well, now it is gonna be off to the mechanic for $75 per hour. I cannot figure it out.
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Old 02-07-2012, 07:39 PM
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I had a 95 in my shop this week with the same problems.

CPS-cam position sensor fixed it.
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