Smoking on decel only

[askoncemore]

I replaced my pcv valve and canister that mounts to the valve cover and my smoking on decel went away. 

Check all of you vacuum hoses... good vacuum helps the rings seal.

 

[ajpturbo]

I replaced my pcv valve and canister that mounts to the valve cover and my smoking on decel went away. 

Check all of you vacuum hoses... good vacuum helps the rings seal.

Yes and good vacuum helps the turbos drain . Also I doubt this is an issue but the 10w- oil you think the dealer used is not correct and will be a bit thicker when cold and will increase oil pressure which may be excessive for the seals..Garrett has a section on that issue

 

[Jordan]

I replaced my pcv valve and canister that mounts to the valve cover and my smoking on decel went away. 

Check all of you vacuum hoses... good vacuum helps the rings seal.

What do you mean by the pcv valve and canister? I replaced the valve cover and the PCV just not sure what you mean by using both those words. Also not sure what oil they used I assume it's whatever ford suggests which honestly I have never bothered to do an oil change myself on this vehicle so I am not sure what they call for.

 

[ajpturbo]

The canister separator on top of the valve cover you should try flushing with solvent or replacing..sho bro had that problem that helped with smoking

 

[Jordan]

The canister separator on top of the valve cover you should try flushing with solvent or replacing..sho bro had that problem that helped with smoking

Ah yes that was replaced via the TSB for the valve cover. So that is all new OEM

 

[Jordan]

this one

 

[SHOdded]

When was it replaced, Jordan?  If you are finding more than a misting of oil in the turbo piping, or a goodly amount of accumulation in the intercooler, worth changing out the PCV valve and separator.  At least pull them and inspect closely

 

[Jordan]

When was it replaced, Jordan?  If you are finding more than a misting of oil in the turbo piping, or a goodly amount of accumulation in the intercooler, worth changing out the PCV valve and separator.  At least pull them and inspect closely

3 weeks max on replacement.

 

[Jordan]

Like I said the PCV has not even been hooked to the intake for about a week now so nothing oil wise has been going into the intake from the PCV.

 

[ryanp49]

Typically smoke on decel with high engine rpm and closed throttle...AKA high vacuum situations, is a result of bad valve stem seals allowing oil to be sucked around the seals during high vacuum situations. Which explains why it doesn't do it any other time...now I will admit these cars with all their turbo piping and PCV routing make it hard to make a 100% certain diagnosis over the internet. But that's the typical scenario that bad valve stem seals will rear their ugly head...and as they get worse they will leak down into the cylinder over night and cause smoke on startup. Which some will diagnose as bad turbo seals...which it could be LoL Forced induction engines are fun...but they can be a pain when it comes to tracing certain issues down!

 

[Jordan]

Valve stem seal would be crazy. I'm not smoking on start up but that seems to be about the only thing it could be at this point. Previously I looked up to see if anybody had needed to do valve stem seals and I couldn't find a case of it. I'll look into it more now

 

[StealBlueSHO]

Valve stem seal would be crazy. I'm not smoking on start up but that seems to be about the only thing it could be at this point. Previously I looked up to see if anybody had needed to do valve stem seals and I couldn't find a case of it. I'll look into it more now

I have never seen anyone on the SHO forums have a diagnosis of valve stem seals. Not that I couldn’t happen, just haven’t seen it.

Might be worth while checking on the F150 EB forums as they tend to run their motors harder so someone over there might have seen it...

If I am not mistaken, wouldn’t a compression leak down test confirm or deny it? I could be wrong on this.


Sent from my iPhone using Tapatalk

 

[Jordan]

Valve stem seal would be crazy. I'm not smoking on start up but that seems to be about the only thing it could be at this point. Previously I looked up to see if anybody had needed to do valve stem seals and I couldn't find a case of it. I'll look into it more now

I have never seen anyone on the SHO forums have a diagnosis of valve stem seals. Not that I couldn’t happen, just haven’t seen it.

Might be worth while checking on the F150 EB forums as they tend to run their motors harder so someone over there might have seen it...

If I am not mistaken, wouldn’t a compression leak down test confirm or deny it? I could be wrong on this.


Sent from my iPhone using Tapatalk

Compression test wouldn't show a bad valve stem seal. I think you are thinking a valve seal itself that seals the valve to the head while a valve stem seal seals the camshaft side of things.