Startup Throttle Surge

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Sep 24, 2002 | 02:10 AM

#16

the law

Elder User

Joined: May 2001

Posts: 760

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From: Billings, MT

Startup Throttle Surge

Someone once told me the idea behind the surge was to get the oil moving in a hurry, and that it causes nearly the same amount of wear to start it in the morning at 2000 rpms as 800, so the benefits out-weigh the consequences. The newest Ford I own is my '89, and it surges to about 1400-1500. The 2001 Windstar I drive for a living surges it's little 3.8L to nearly 3000 on startup.

The Law
1989 F-250 HD 4x4
460, C6, BW 13-56
Almost Stock

Sep 24, 2002 | 12:22 PM

#17

DCELR8TOR

New User

Joined: Aug 2002

Posts: 5

Likes: 0

From: Newbury Park USA!!!

Startup Throttle Surge

I also have a high-idle start up (1750) and I agree with Ken on the swoosh, I too think its the clutch fan.
But no roar, just a whistle!

D-cel

Sep 24, 2002 | 08:08 PM

#18

adolphbell

Freshman User

Joined: Aug 2002

Posts: 34

Likes: 0

From: Nixa, Missouri

Startup Throttle Surge

When my truck starts it hits 1700-2000 rpm, then quickly drops to 1000 rpm. Seems perfectly normal to me. I have never had a vehicle that did not do something similar on starting.

2002, F250, V10, CrewCab.

Sep 24, 2002 | 09:25 PM

#19

ke6jcf

Senior User

Joined: Sep 2002

Posts: 487

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From: Hibbing, MN

Startup Throttle Surge

Well, might as well throw in my 2 cents. Talked to the mechanic this morning about my V8 doing the same thing. My worry is oil not being there for those high RPM starts. He laughed and said that's why Ford recomends 5W30 & 5W40, gets that thin stuff up there in a hurry!!
Whant to also say thanks to Steve for all the good info and parts regarding the headlights. Aero conversion, the only tough part is connecting the pig tail to the old wiring so the new bulbs will plug in.
Thanks

Sep 25, 2002 | 10:29 PM

#20

cobragt350

New User

Joined: Sep 2002

Posts: 2

Likes: 0

From: Vancouver

Startup Throttle Surge

Funny, mine only does it when you put it in gear, 02 F250 V10 Auto. One garage door later you learn to put your foot on the brake HARD when you put it in gear.

Oct 1, 2002 | 11:15 AM

#21

garymake

Senior User

Joined: Apr 2002

Posts: 377

Likes: 0

From: Cary USA

Startup Throttle Surge

My SD does exactly what you describe above. When I start it after it has sat for two or more days, the RPMs surge to around 3000 with a roar and then settle back down. If I start it every day then I see what others are seeing (a surge to 1700 or so).

87 Octane and 2300 miles...

Why the difference?

Gary M.

White 2002 F250 SD, SC, SB, 4x4, 6.8L v10, 3.73LS, 4spd Auto, Reverse Aid Sensor, Class IV Hitch, Offroad Package, Manual Hubs, 40/20/40 Bench Seat, Camper Package, Lariat, Putco Locker Side Rails, Mud Flaps, K&N Filter, Vent Visors...

White 2002 Ranger 4x2 3.0L V6 XLT 2 door supercab with the power group, auto, chrome wheels, mud flaps, body side molding, vent visors, and the 60/40 bench seat as my daily driver

Oct 1, 2002 | 11:26 AM

#22

CY25

New User

Joined: Sep 2002

Posts: 8

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From: Texas

Startup Throttle Surge

Well since I shared this problem with everyone it really hasn't done it.

I feel better that it just might be an inherent problem. I'm OK with it just as long as someone doesn't write about that happening and a head blowing off

Oct 2, 2002 | 08:06 AM

#23

RonBo

Senior User

Joined: May 2001

Posts: 113

Likes: 0

Startup Throttle Surge

Some various ramblings to the different posts:
The throttle surge at startup is to get the cats warmed up so that the vehicle can run in closed loop mode for emissions.
5W30 was recommended due to the tighter tolerances in engine machining over the last few years, especially for journal clearances on the overhead cams.
5W20 is for fuel economy due to the lower viscosity.
When you hear the fan roar at cold startup, it is known as morning sickness. The clutch fluid has backed up into the drive chamber.