Just started this Friday night.When I start it only after sitting all night or for more than 4 hours it revs up really fast and then drops back down???? [img]/ubbthreads/images/graemlins/confused.gif[/img]Only last for 1 to 2 seconds but still it scared the chit out of me the first time .
It has been cold lower 50-40s??
So whats the deal??
I really hate reving a cold motor and it cant be good.
Any help please..
twinbulls
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1999.5 F-250 Lariat SD CC SRW LB Loaded V10 auto 4x2 K&N FIPK,Poweraid spacer,muffler deleted,custom seat covers,wood dash kit,tinted windows.BFGs 285s. A-Pillar gauges Tranny temp,oil pres and water temp.Hypertech PP 111 with themostat 160 deg.
ARE Custom Top W/ladder rack,Added a center seat/armrest,Clear corner lenses,TT mirrors, Rancho RS 9000X with incab remote, A work truck you can valet. NRA Life member. My Truck
I watched my tach closely this morning as it was 5 degrees F. When it first started, it stayed at 1500 RPM's for a second or less, then settled in at about 1100 RPM's. Not sure what you mean by fast RPM's, but this seems normal to me. My old 351 motor with a 4 BBL carb stayed at 2300 RPM's [img]/ubbthreads/images/graemlins/eek.gif[/img] on the fast idle cam, and that was at spec per the service manual. 165K miles later, it still ran strong when I sold it. [img]/ubbthreads/images/graemlins/wink.gif[/img]
__________________ FOKISD Charter Member from Hillsboro, OHIO
'01 F-350, XL, SC, LWB, V-10, 4R100, 3.73 LS, High Back Buckets, TT Mirrors, Roof Lights, Camper Package - Check my Photo Gallery for modifications. Michelin LTX M/S on Mickey Thompson Classic II's, A.R.E. DCU cap, Reese Titan V and Draw-Tite front reciever, Audiovox cruise control, Wolf center console, Truck-Lite rear ID bar, Hella FF75 driving lights. Bilsteins on each corner.
It's normal fast idle advance for quicker engine warm-up per ford spec. My friend's toyota 22r motor idled at about 1500 - 2000 rpm to warm it up quick in the cold weather. However it was carbureted. Btw same thing happened when i cranked up a 5.4l triton v8 at the dealer lot as well as a triton 6.8l v10 so i doubt it's anything to worry about. It will auto-kickdown as the coolant warms up to temperature.
A little higher at startup is normal, but I don't think that's what he's asking about. Once in a great while, my RPM's really jump on start up. I never touch the gas pedal while starting, but it's like starting with the pedal pressed down. I've never looked at the tach, but it sounds like it might be going to 3000 for a split second. I've heard others with the same thing, so I figure it's a normal quirk for the Super Duty.
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Y2K F350 CC DRW LWB 4x4 Lariat 4R100 V10 4.30ls.
98 Alpenlite Pendelton 11'10 slide-in camper.
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