Rough idle at start-up
Thread Starter
|
Tuned
Joined: Jan 2004
Posts: 473
Likes: 13
From: Hickory, North Carolina
Thanks Ron. I guess I'll have to run it in to the shop because I don't know how to check either. But, I appreciate you getting me headed in the right direction.
Thanks, David
Thanks, David
Thread Starter
|
Tuned
Joined: Jan 2004
Posts: 473
Likes: 13
From: Hickory, North Carolina
Here is the latest.......
Dealership tested the GP's and the GP relay, all good.
Found number 8 injector bad, replaced and cleaned the other 7, also did a compression test, compression good..
Got it back, same problem, back to the dealership.
Dealer replaced ICP sensor. Next cold start, same problem.
Can anyone PLEASE help steer me in the right direction as to what this problem could be. I'm at my wits end!
David
Dealership tested the GP's and the GP relay, all good.
Found number 8 injector bad, replaced and cleaned the other 7, also did a compression test, compression good..
Got it back, same problem, back to the dealership.
Dealer replaced ICP sensor. Next cold start, same problem.
Can anyone PLEASE help steer me in the right direction as to what this problem could be. I'm at my wits end!
David
Senior User
Joined: Apr 2004
Posts: 340
Likes: 0
From: Maryland
Switch oil over to Rotella 5 -40 Synthetic. This will fix your problem if its when you first start the truck and its cold out and it does a kinda "bucking" idle jump for 5-10 seconds, then settles in normal.
Thread Starter
|
Tuned
Joined: Jan 2004
Posts: 473
Likes: 13
From: Hickory, North Carolina
Does this sound the 5-40 Rotella synthetic will cure my problem? I'm a little curious what this could be caused from, I have used the Motorcraft 5-40 conventional oil since it was new and I have 196k on it now. Thanks, David
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
It will help, just for smoothness, but this sounds more like a Glow Plug Relay(GPR) Next cold start try jumpering the posts on the relay for about 30 seconds to a minute or so.
Trending Topics
Thread Starter
|
Tuned
Joined: Jan 2004
Posts: 473
Likes: 13
From: Hickory, North Carolina
I put my test light on the load side of the GPR to see how long it is energized. I checked it twice and both time it stayed on for 35 seconds, so, when I cranked the truck the next time I paid no attention to the dash light and waited 35 seconds before I started the truck but got the same result. Rough idle and white smoke. This would indicate that the GPR is ok, correct? David
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Elder User
Joined: May 2007
Posts: 506
Likes: 0
Not sure if this would help all that much but have you tried cycling your glow plugs a couple times before firing up the truck?
From my understanding, white smoke on ignition comes from unburnt fuel. There is a good chance your engine is surging cause of the cold, mine does that too some mornings.
My $.02, find a GOOD diesel mechanic in your town and stop going to the dealership. They'll @#$@#$*@&#$(*&# you all day long. I've never heard of a dealership that has the customer's best interest in mind. A local small shop with a good owner might be the other way around.
From my understanding, white smoke on ignition comes from unburnt fuel. There is a good chance your engine is surging cause of the cold, mine does that too some mornings.
My $.02, find a GOOD diesel mechanic in your town and stop going to the dealership. They'll @#$@#$*@&#$(*&# you all day long. I've never heard of a dealership that has the customer's best interest in mind. A local small shop with a good owner might be the other way around.
Senior User
Joined: Apr 2004
Posts: 340
Likes: 0
From: Maryland
It's a rough idle, very choppy, it lasts for about 10 - 12 seconds. After the first 2-3 seconds of the choppy idle I get white smoke from the tail pipe. Once the rough idle stops the white smoke stops. On a warm restart, no rough idle, no smoke, it only occurs after the truck sits and gets cold.
Does this sound the 5-40 Rotella synthetic will cure my problem? I'm a little curious what this could be caused from, I have used the Motorcraft 5-40 conventional oil since it was new and I have 196k on it now. Thanks, David
Does this sound the 5-40 Rotella synthetic will cure my problem? I'm a little curious what this could be caused from, I have used the Motorcraft 5-40 conventional oil since it was new and I have 196k on it now. Thanks, David
You be amazed how the Rotella 5 -40 Synthetic smooths cold start ups and idle characteristics.
It definitely would not hurt to put that in next oil change.
As far as what else it could be, i would lean towards the GPR as others are saying too. WHen mine when bad it would pump out white smoke when trying to start then slowly go away as it got warm. Definitely would switch that out first since honestly that is the most common problem. Its very cheap and take 10 minutes to switch.
Lead Driver
Joined: Jan 2007
Posts: 6,708
Likes: 5
From: Kiowa CO
I had a GPR that would work intermittently and drove me nuts. It would light the test light but not at the full voltage that was needed to properly energize the glowplugs hot enough for the truck to start normally. I think you need to swap the GPR.