strange idle problem?
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
strange idle problem?
Just yesterday my truck developed a weird idle. It's not erratic or missing just noticeably louder than it was before. Especially from inside.
The truck runs great and is quieter when you hit the skinny pedal. On the highway I can't even tell anything is wrong.
There are no check engine lights at any time. I have a scangauge which is reading everything coming off the PCM as normal. I'll use the DTC reader on it today and run the injector buzz test as well.
Has anyone ever had anything like this?? I keep thinking I'm hearing things but I know how my truck is supposed to sound.
The truck runs great and is quieter when you hit the skinny pedal. On the highway I can't even tell anything is wrong.
There are no check engine lights at any time. I have a scangauge which is reading everything coming off the PCM as normal. I'll use the DTC reader on it today and run the injector buzz test as well.
Has anyone ever had anything like this?? I keep thinking I'm hearing things but I know how my truck is supposed to sound.
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
Low oil will cause sporatic surge time to time, We had an oil pressure sensor go out on his and it would cause the truck to surge, as if it were being fed a bit of fuel, I know when they get a couple quarts low this can happen as well. Not sure if this is what you are talking about, but just throwing it out there.
Check your CPS too.
Check your CPS too.
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
I'll check the oil. Edit: Just had the oil changed 1000 miles ago and after checking its still full and in decent condition. I can tell you the tach sits at 700 RPM and doesn't move. It fires right up.
I unplugged the ICP sensor and no difference so that's not it.
Didn't check any oil pressure senors yet. Where is that located??
I unplugged the ICP sensor and no difference so that's not it.
Didn't check any oil pressure senors yet. Where is that located??
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
Update: It got a lot worse sounding almost like the truck was going to fall apart at idle. But you hit the gas and it still goes away. Took it to my friend who is actually a Powerstroke Diesel Mechanic at the local Ford dealership. He took one look and listened to it. He's guessing a flywheel that's about to break. I actually have a really good aftermarket warranty so its going into the Ford dealership today.
I felt really good about all the stuff I had ruled out thanks to this site. I'll let you know what it is.
I felt really good about all the stuff I had ruled out thanks to this site. I'll let you know what it is.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
5-speed, then? I was thinking flywheel or throwout bearing.
When you drive it, cruising down the road, and you throttle down but keep the clutch engaged, do you hear/feel any clunk/clack from the transmission/flywheel area?
When you shut off the engine, does it make an extra "clack" sound just as the engine comes to a stop?
When you drive it, cruising down the road, and you throttle down but keep the clutch engaged, do you hear/feel any clunk/clack from the transmission/flywheel area?
When you shut off the engine, does it make an extra "clack" sound just as the engine comes to a stop?
Trending Topics
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
I had a downpipe put in over 2 years ago and it has never been a problem. Not saying it isn't but we'll find out. I don't feel too bad having my friend work on the truck as he's the one that Eastern WA dealers sends their Ford Diesels to when they can't figure it out.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Did you mash the pinch weld on the firewall/floor of the cab well out of the way? How much clearance did you have at the time? Just thinking if it was real close, maybe in the intervening time the cab mounts have settled just enough that it's now starting to interfere with the pipe.
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
I should mention its an auto trans. You know I think I misunderstood him. He probably meant the flex plate as I know the flywheel problem is only on the manuals, right? It does it in park, neutral, or any gear at 500-700 RPM. Get above that and its gone.
I sent my friend a text to check the downpipe clearance as I honestly don't remember when I had another friend put it in. Good thought, madpogue.
It literally sounds like a gas engine that has broken a rod or something. It's a freaking horrible sound. But like I said just blip the pedal and its gone.
I sent my friend a text to check the downpipe clearance as I honestly don't remember when I had another friend put it in. Good thought, madpogue.
It literally sounds like a gas engine that has broken a rod or something. It's a freaking horrible sound. But like I said just blip the pedal and its gone.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Just reach under there (wait 'til exhaust is COLD), grab the pipe up close to where it passes between the tranny and firewall, and wiggle it around a little and see if you hear it hitting the cab.
Thread Starter
|
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
Another Update:
My friend called this morning. It is in fact, the flexplate. It's totally busted. 850 bucks to replace but my aftermarket warranty will hopefully cover most of it. The warranty has already bought me a new Ford tranny, fuel pump, serp belt, and tensioner so hopefully I can get this covered too.
My friend called this morning. It is in fact, the flexplate. It's totally busted. 850 bucks to replace but my aftermarket warranty will hopefully cover most of it. The warranty has already bought me a new Ford tranny, fuel pump, serp belt, and tensioner so hopefully I can get this covered too.
Thread
Thread Starter
Forum
Replies
Last Post
spease209
1999 - 2003 7.3L Power Stroke Diesel
3
Oct 9, 2009 12:04 AM
