Let's talk about this shudder I'm having.
Thread Starter
|
Postmaster
Joined: Sep 2002
Posts: 3,077
Likes: 1
From: None of your business
Let's talk about this shudder I'm having.
2000 F150 5.4 4x4 4R70W 95000 miles
I'm getting the standard TC lockup rumble strip like shudder. Trying to narrow it down to actually being a tranny problem or a misfire.
Right now I have no codes that I know of. I'll scan again tomarrow. The fluid is fresh Mercon V. After it still shuddered, I added Lubegard for Mercon V and still the shudder is there. I've owned the truck since 59000 miles and it didn't have any problems when I bought it. I've changed the fluid at least every 20K, usually sooner.
What I have noticed lately is that I can't remember is ever shuddering when it has been cold. Pretty much only after warm up.
I have heard of an intermitent misfire that only happens when the engine is run really lean and doesn't throw a code. Something with a COP being partially shorted. What kind of test is needed to diagnose this?
I'd love to fix this and I'm hoping that it's just a bad COP or two.
Mike
I'm getting the standard TC lockup rumble strip like shudder. Trying to narrow it down to actually being a tranny problem or a misfire.
Right now I have no codes that I know of. I'll scan again tomarrow. The fluid is fresh Mercon V. After it still shuddered, I added Lubegard for Mercon V and still the shudder is there. I've owned the truck since 59000 miles and it didn't have any problems when I bought it. I've changed the fluid at least every 20K, usually sooner.
What I have noticed lately is that I can't remember is ever shuddering when it has been cold. Pretty much only after warm up.
I have heard of an intermitent misfire that only happens when the engine is run really lean and doesn't throw a code. Something with a COP being partially shorted. What kind of test is needed to diagnose this?
I'd love to fix this and I'm hoping that it's just a bad COP or two.
Mike
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
cruse down the road at 55 and see if you can barly feel the miss. back off on the throttle and it almost goes away. stomp on the throttle (dont down shift) and you can really feel it stumble--- that is a plug or COP. the torque converter does not do extra shudder just because you hit the throttle
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
are you using any antifreeze? level dropping? if so, look at the front plug on drivers side and see if there is any wetness from intake/water manifold leakage. then look at the rear plug for wetness from leaking heater hose.
Elder User
Joined: Jun 2004
Posts: 883
Likes: 2
From: La Crosse, Kansas
Your friendly Ford dealership can run a stress test on your COPs, it sounds to me like you have a COP dropping off under load. This won't present a code, but can be difficult to diagnose without a stress test.
Thread Starter
|
Postmaster
Joined: Sep 2002
Posts: 3,077
Likes: 1
From: None of your business
I'll check the coolant, but I think it's ok. When I cruise at 45-55, there is no miss. The only time I ever feel anything like a miss is when I'm idling at a light or something. Then every once in a while it will feel like one of the cylinders has a slight miss, but only every once in a while will this happen.
New plugs were put in at 85000 when the engine was rebuilt. I have since put a new plug in the #1 cylinder when it self destructed. It didn't blow out of the head, the ceramic came apart in the cylinder and the grounding strap was totally gone. I have no idea how it didn't take a valve or piston out with it. The plug was only about 7000 miles old.
How much will a stress test run me? I can get all new coils with boots and springs for about $100.
Mike
New plugs were put in at 85000 when the engine was rebuilt. I have since put a new plug in the #1 cylinder when it self destructed. It didn't blow out of the head, the ceramic came apart in the cylinder and the grounding strap was totally gone. I have no idea how it didn't take a valve or piston out with it. The plug was only about 7000 miles old.
How much will a stress test run me? I can get all new coils with boots and springs for about $100.
Mike
Trending Topics
Elder User
Joined: Jun 2004
Posts: 883
Likes: 2
From: La Crosse, Kansas
All new coils for $100? Doesn't sound like anything I'd put in my truck! Our modulars are very picky about the brands of parts you use on them. They only seem to like Motorcraft plugs and Motorcraft coils. All 8 coils will cost you about $800 at the dealership, but I seriously doubt that will fix your problem. A stress test will usually cost you about an hour of diagnostic time, so $75 to $100 depending on where you live, but it will narrow down your symptoms. If you're feeling a miss or shudder at idle, you may have an iac acting up. what brand of plugs were used and were they gapped properly? Also, why did you motor need a rebuild at only 85,000mi? These motors will run past 300,000mi with a good maintenence regimen! I wouldn't just start shotgunning parts at your truck until you or your mechanic can diagnose exactly whats going on, it can get expensive and frustrating!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
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
Thread Starter
|
Postmaster
Joined: Sep 2002
Posts: 3,077
Likes: 1
From: None of your business
They are Globals from Ebay. I've heard good things about them. Most of the plugs are Autolite. The replacement it Motorcraft and they are gapped correctly.
The engine needed to be rebuilt because the intake manifold gasket blew around the #1 cylinder, dumped coolant into the cylinder, blew the head gasket, and overheated the engine. Up until then, I did meticulous maintence.
I'm not really feeling a miss at idle. That's just the most miss like thing I've noticed. It's probably just engine vibration.
The problem is the shudder when the torque converter locks when the truck is warmed up. I've researched it down to the torque converter or the coils. I can't remember it shuddering when cold. I'm thinking that the fuel mixture is richer when it's cold, making it easier to ignite. Once it gets warm, it leans out the mix and the weak coil can't light it well.
Mike
The engine needed to be rebuilt because the intake manifold gasket blew around the #1 cylinder, dumped coolant into the cylinder, blew the head gasket, and overheated the engine. Up until then, I did meticulous maintence.
I'm not really feeling a miss at idle. That's just the most miss like thing I've noticed. It's probably just engine vibration.
The problem is the shudder when the torque converter locks when the truck is warmed up. I've researched it down to the torque converter or the coils. I can't remember it shuddering when cold. I'm thinking that the fuel mixture is richer when it's cold, making it easier to ignite. Once it gets warm, it leans out the mix and the weak coil can't light it well.
Mike
Thread Starter
|
Postmaster
Joined: Sep 2002
Posts: 3,077
Likes: 1
From: None of your business
It just has the classic signs of a rumble strip like vibration when it locks into OD. Wheels should be balanced and U-joints are fine. It also only does this when warm.
Today when I was sitting at a light, it did feel like every so often it partially misfired if that's possible. I know what a total misfire feels like with this engine all to well.
Mike
Today when I was sitting at a light, it did feel like every so often it partially misfired if that's possible. I know what a total misfire feels like with this engine all to well.
Mike
Thread Starter
|
Postmaster
Joined: Sep 2002
Posts: 3,077
Likes: 1
From: None of your business
You mean like injector cleaner? In any case, if they were bad they would have been replaced when the engine was rebuilt. About the only thing reused was the injectors and the COPs.
Mike
Mike