I posted this in the super duty forum and it was suggested that I move it here so what do you think? I have a 08 with 73000 miles and it left me on the side of the road within 5 miles it went from acting slugish to not running. I disconected the battey thinking it would reset itself and all i did was clear the codes. So I hauled it in and when cold it would run so we drove it with the scanner hooked up till it came up with a bank one effeciancy error code then called the dealer and it was covered under some extended emisions warranty.
Got the truck back two weeks later and it is not right it seems to run ok but now its a little slugish. It has what sounds like a lifter nock that you can here only after it gets warm 3 min. or so Not the manifold, it seems high on the drivers side untill you go under the truck then it sounds like its all over. Next it I have seen the oil pressure drop and pop right back up a few times wile trying to find were the sound was coming from sending unit?? Last I drove the truck 3 miles from cold when I parked it to look for the noise the radiator was hot to the touch not sure if that is normal or not?
Ok I dont know what all this has in common but it has all happend at once any ideas, its going back in just trying to see what this could cost me?

 

Get some Engine RX and see if that won't straighten out any internal issues. Also get a 5-Star programmer from Mike in 87-Tow, 89-Tow, and 91 Performance. Good stuff.

Pap

 

It seems you are experiencing several problems all at once , may be related ,may be not . Engine running sluggish, trouble with oil pressure, overheating radiator and oxygen sensor error at one bank.

Are the oil changes done regularly over the years (one owner) ?

You may need a "engine compression test" to see if all cylinders are OK ,if any oil related damage is suspected .

For o2 sensor issue , you may try to clean your "MAF sensor" , it may resolve it .

For sluggishness , you can change your air filter ,fuel filter (if it has not been changed recently), check PCV valve &its hoses -and all vacuum hoses for leaks. A fuel pressure test may be needed to see if there are any issues with fuel system (a dying fuel pump, bad regulator .etc.), check all your sparkplugs , boots and coils .

For overheating radiator , check your thermostat to see it is not stuck close , check fan clutch is working ,of course the coolant level .

Most of them are DIY items . Last several years we are hearing about more and more V-10 engine failures , that is a bit disturbing to me . On the other hand I personally saw a 2003 F-350 flat bed with V10 in commercial use with 400+K and still running fine .

Good luck,

 

Start with the compression check. They must be atleast 80 PSI or above. I wouldn't go back to where you first took the truck.

Is there any codes right now other than the o2 sensor code?

 

That is normal and to be expected when your cooling system for the V10 is the same size as that of the V8.

My truck is hot (the water temp) by the time I drive about 1 mile, which is nice when it is cold outside because it means my heater is keeping me warm.

 

Thank you for the replies I have been realy swamped with work. Any ways I got the truck back from the dealer after towing it there twice now and they are telling me they cant find any thing wrong with it? The computer shows nothing and thats what I got, so now the oil pressure has not missed a beat in a 100 miles that I know of. The problem is the noise that is only noticable after it gets warm like a lifter nock but it realy kind of fades as the engine gains rpms. Also I think the exhast may be a little white not sure though it is starting to get a little cold out know. I have not checked the compression yet and im planning on trying to get some of that auto Rx but any other help would be great thanks.

 

I use a temp gun to check my heat on the motor and trans. Cheap investment for piece of mind. Does the 08 have the same inherent problem with broken exhaust studs? That sounds like a lifter knock.

 

One of the manifolds was changed last year the other may have a broken stud, but it only makes the nois when it gets up to temp. And as it being a lifter noise it almost goes away with more rpm? Every one I talk to has no clue, im not sure what to think. Iif it had an exhaust issue after getting the new converters wouldnt the sound get better after it was hot not worse?

 

Buy a $10 mechanic's stethoscope. Use it to pinpoint where the noise is coming from. Report back.

 

I have tryed a long handled screw driver and it seemed like the center of both valve covers more the drivers side but was also very noticeable on one of the exhaust studs the easy one to get at. Im not sure where its coming from because under the truck its coming from every where

 

Let me try this again...

STEP 1: BUY A $10 MECHANIC'S STETHOSCOPE

A screwdriver may work sometimes, but a stethoscope is a much better tool for trying to pinpoint something like this. And, assuming you actually break off a Hamilton (or a pair of Lincoln's) to go buy one, probe everything you can think of: exhaust manifolds, exhaust studs, all over the valve covers, COP's, injectors, water pump, alternator, idler pulleys, oil pan, bell housing... everything you can get to. When you find where the noise is actually coming from, instead of where it is seeming to come from, report back.


I'm not trying to be a ***** here. But, it's often very difficult to diagnose strange noises when you have the truck sitting right in front of you. Doing it over the internet, with descriptions like "it seemed like", and "I'm not sure", makes it nearly impossible.

 

I understand that and i can get one. I will check those things out and see what I find thanks

 

well picked up a stethoscope and spent a good 45 min checking every thing I could get to. The driver side manifold seemed to be the loudest but man that same noise seems to resonate through the injectors, coil packs and valve covers on both sides. The oil pan seemed good along with pulleys and the timing chain cover area. maybe I can get another set of ears to confirm but any ideas?

 

Ok. I'm assuming that the noise is audible to the naked ear while you are testing with the 'scope. So since the noise is the loudest at the driver's side manifold, how do your manifold studs look? Is there any indication of an exhaust leak? I don't think that would cause your symptoms (certainly not the oil pressure gauge flat-lining), but it's worth eliminating.

The injectors should produce a light, but distinct and regular, ticking sound, and they should all sound about the same.

The COP's are bolted to the intake and can pick up ticking from a nearby injector, but it should be pretty faint (fainter than the injector itself), and they should all sound pretty much the same. If you notice one or two that are substantially louder than the others, the boots may be bad and the spark may be shorting to the head. That could cause sluggish performance.

 

Still sounding like exhaust manifold to me. Looking at the inside of the motor up to the 3v, there are no lifters to make a lifter noise. I have a slight noise right now on my motor until it warms up but i am sure it is broken studs. Even though i replaced them a year ago. ALL OF THEM