Transmission problem?
Thread Starter
|
Postmaster
Joined: Jul 2011
Posts: 3,263
Likes: 0
From: Houston, TX
Transmission problem?
hi guys, i have a friend who has a 99 f-150 5.4 v8. i'm trying to help him. he mentioned tat in the morning, when he starts the truck up, and if he decides to shift right away to drive off, it appears rough with a slight "thud" when he shifts. not loud but a slight jerking "thud".
now, when he lets it sit there for bout 3 to 4 mins, it shifts fine with no thud watsoever. truck has over 230,000 miles on it. not sure bout transmission fluid change. could it be battery or just changing the transmission fluid?
appreciate all y'alls help in advance.
now, when he lets it sit there for bout 3 to 4 mins, it shifts fine with no thud watsoever. truck has over 230,000 miles on it. not sure bout transmission fluid change. could it be battery or just changing the transmission fluid?
appreciate all y'alls help in advance.
More Turbo
Joined: Aug 2011
Posts: 544
Likes: 2
hi guys, i have a friend who has a 99 f-150 5.4 v8. i'm trying to help him. he mentioned tat in the morning, when he starts the truck up, and if he decides to shift right away to drive off, it appears rough with a slight "thud" when he shifts. not loud but a slight jerking "thud".
now, when he lets it sit there for bout 3 to 4 mins, it shifts fine with no thud watsoever. truck has over 230,000 miles on it. not sure bout transmission fluid change. could it be battery or just changing the transmission fluid?
appreciate all y'alls help in advance.
now, when he lets it sit there for bout 3 to 4 mins, it shifts fine with no thud watsoever. truck has over 230,000 miles on it. not sure bout transmission fluid change. could it be battery or just changing the transmission fluid?
appreciate all y'alls help in advance.
These engines rev high when first started cold.Mine is around 1400 rpm for at least 30 seconds.
Thread Starter
|
Postmaster
Joined: Jul 2011
Posts: 3,263
Likes: 0
From: Houston, TX
thank y'all for ur time and patience. feel free to pm me or chime in again if there's anything else to add. thank u.
Trending Topics
More Turbo
Joined: Aug 2011
Posts: 544
Likes: 2
You're welcome,I get a little impatient with mine sometimes,
it seems like it takes for ever to idle down.
it seems like it takes for ever to idle down.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Here are the reasons it takes time for the idle to come down to normal.
..On a cold start the head temperature is looked at from the head sensor when the ignition switch is operated to the 'run' position before cranking the motor.
..This sets the IAC open full, the fuel injected amounts are increased, the ignition timing is advanced.
..At crank and fire, the idle is high depending on the temperature seen just before cranking.
..As the OX sensors heat up and the head temperture begins to rise, the idle is allowed to lower by computer step logic decision, as these values change.
In very low temperatures the high idle will remain higher for a longer period of time before beginning to lower until temperature of the motor begins to rise.
.
Bottom line: If you didnot have these functions in place you could not drive off with a cold engine without stalling. I just know you would love that!
Also dropping a transmission into gear at higher rpm shocks the drive line.
This is the way all modern engines react to low temperature.
I think some body needs to slow their life down just a bit and be more reasonable.
..On a cold start the head temperature is looked at from the head sensor when the ignition switch is operated to the 'run' position before cranking the motor.
..This sets the IAC open full, the fuel injected amounts are increased, the ignition timing is advanced.
..At crank and fire, the idle is high depending on the temperature seen just before cranking.
..As the OX sensors heat up and the head temperture begins to rise, the idle is allowed to lower by computer step logic decision, as these values change.
In very low temperatures the high idle will remain higher for a longer period of time before beginning to lower until temperature of the motor begins to rise.
.
Bottom line: If you didnot have these functions in place you could not drive off with a cold engine without stalling. I just know you would love that!
Also dropping a transmission into gear at higher rpm shocks the drive line.
This is the way all modern engines react to low temperature.
I think some body needs to slow their life down just a bit and be more reasonable.
Post Fiend
Joined: Jan 2007
Posts: 18,157
Likes: 0
From: Stanton DE
Thread
Thread Starter
Forum
Replies
Last Post
cdawley4
Clutch, Transmission, Differential, Axle & Transfer Case
5
Sep 30, 2004 05:41 AM
cact34r
1997 - 2006 Expedition & Navigator
5
Feb 17, 2002 02:58 AM
