Engine surging at idle???? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 01-06-2010, 10:31 AM Thread Starter
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Engine surging at idle????

OK, this is a question for a buddy of mine. He says if he leaves it idle for a little while it will start reving up or surging however you want to call it. His truck is an 08 all stock except for lift and tires.

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post #2 of 8 Old 01-06-2010, 12:10 PM
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Is it only when it's cold outside. Truck has a high idle to warm the engine.

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post #3 of 8 Old 01-06-2010, 12:25 PM Thread Starter
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It revs the engine up and down?

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post #4 of 8 Old 01-11-2010, 05:51 PM
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RPM probably not changing that much, probably the egr cycling?? Just a thought
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post #5 of 8 Old 01-30-2010, 01:15 PM
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read the owner's manual, it states the engine will do this & all is normal.
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post #6 of 8 Old 01-31-2010, 04:08 PM
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I actually had mine do the same thing last night. It was almost like it had a lope idle or something; it would rev up to about 550RPm then back to 500RPM and just keep doing it. I turned it off then turned it back on and it wen away.

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post #7 of 8 Old 01-31-2010, 07:09 PM
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Quote:
Originally Posted by brendanlush View Post
I actually had mine do the same thing last night. It was almost like it had a lope idle or something; it would rev up to about 550RPm then back to 500RPM and just keep doing it. I turned it off then turned it back on and it wen away.
This is becoming really common it seems. I have seen numerous threads, and I too have been having lope idle and smoke problems. More so since I updated to the strategy flash system.
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post #8 of 8 Old 02-01-2010, 05:57 AM
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Rolling idle is set by something changing the torque request.

See it a lot more with tuned trucks than stock ones. Try turning the A/C or defrost off. It may be the clutch kicking on and off if the idle isn't changing a lot that may e what is going on.

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