High idle?? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 11-14-2006, 06:19 AM Thread Starter
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High idle??

99' 7.3l

On chilly mornings (20's-low 30's) I will start the pickup about 10-20 minutes before I leave home. The truck always starts fine. On occasion when I come out of the house to leave, I notice the truck idling a little high. When I jump in and give her a little right foot then the rpms will return to the normal idle around 1,500 or so.

Almost forgot to mention that the high idling is slightly under 2,000 or just enough that I can hear that it is idling higher than normal.

Is this abnormal?, any thoughts are appreciated.

thanks,
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post #2 of 11 Old 11-14-2006, 06:42 AM
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The pcm is programmed if the parmeters are met(engine oil temp, intake air temp. and long enough idle time) the engine idle will raise.

99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns

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post #3 of 11 Old 11-14-2006, 10:47 AM Thread Starter
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I do not understand that. Can anyone explain further in more detail.
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post #4 of 11 Old 11-14-2006, 05:47 PM
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let me bump this up for ya, somebody ought to be able to explain further

2004 Excursion
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post #5 of 11 Old 11-14-2006, 05:52 PM
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Yes this is normal for those of us who live in the colder areas! I have the 6.0 and when I start it on cold mornings it will kick up the idle to heat the motor up faster. There is nothing wrong with your truck. Even if you plug it in overnight and then start it, it will do the same thing!

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post #6 of 11 Old 11-14-2006, 05:56 PM
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Quote:
Originally Posted by beerhunter View Post
99' 7.3l

On chilly mornings (20's-low 30's) I will start the pickup about 10-20 minutes before I leave home. The truck always starts fine. On occasion when I come out of the house to leave, I notice the truck idling a little high. When I jump in and give her a little right foot then the rpms will return to the normal idle around 1,500 or so.

Almost forgot to mention that the high idling is slightly under 2,000 or just enough that I can hear that it is idling higher than normal.

Is this abnormal?, any thoughts are appreciated.

thanks,
Your #'s sound high, but yes the 7.3 will increase its idle slightly depending upon a few variables mentioned in the first response.

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post #7 of 11 Old 11-14-2006, 08:35 PM
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basically if it's cold the computer will tell it to high idle, to aid in warming, and to try to prevent wet stacking.

99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns

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post #8 of 11 Old 11-15-2006, 03:31 AM Thread Starter
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Thanks for the info.
If I were to let it idle will it eventually return to normal when it reaches certain parameters.

Also, can you define wet stacking?
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post #9 of 11 Old 11-15-2006, 03:35 AM
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I DIDNT KNOW EITHER so i looked it up for up

Wet stacking occurs in a diesel engine when the engine is run at too light of a load during the run-in (also known as load banking). This causes unburnt fuel and oil to collect in the exhaust stack. The exhaust stack will be coated with a black, sticky, tar-like substance. If you run a new unit at light loads and/or idle for too long, the rings will not seat properly. If it is a diesel, wet stacking may occur. Both of these conditions will cause poor engine life and performance.

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post #10 of 11 Old 11-15-2006, 05:52 AM
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I don't know if it will return to idle afer a long period. If you press the brake pedal, or throttle it will return to normal idle. but if you touch the break and then let it idle again it will raise the idle again.

99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns

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