kbenz
Full Access Member
I think I have an exhaust valve sticking. once it warms up good it starts huffing out the air intake. Is there an oil additive that will help or am I pulling a head? Thanks
sticking valve
- Thread starter kbenz
- Start date
kbenz
Full Access Member
Cracked injector lines. None made a difference.
lotzagoodstuff
Full Access Member
If it’s blowing out the intake, I’m betting it’s not a sticky intake valve, but you could pull the valve covers and see if you can see anything “out if the ordinary”. I’ve caught two gassers with broken intake valve springs in time before they dropped into the cylinder.
IDIBRONCO
IDIBRONCO
I don't know of any miracle cures, but there could be one. I'd say to pull off your valve covers. Maybe you can see a loose or broken rocker bolt.
He did say exhaust valve.
lotzagoodstuff
Full Access Member
You could also use an infrared heat gun to see if one cylinder is colder as it warms up.
kbenz
Full Access Member
That was kind of a guess going by what I've read
kbenz
Full Access Member
Got a compression tester coming tomorrow
mexicanjoe
Full Access Member
camshaft may be going flat
Black dawg
Registered User
Have a video?
kbenz
Full Access Member
I didn’t have a video so I went out and warmed it up to take one. Wouldn’t make the noise so I took it for a drive and it never would do it again. I don’t get it
I have had it in the past that the CDR will get stuck and cause some weird thumping out the intake, maybe give it a quick clean and keep an eye on things? How to clean your CDR
kbenz
Full Access Member
I’m gonna drive it tomorrow when it’s warmer out. Hopefully it doesn’t do it. I’ll clean the cdr either way. Due for oil change too. I’m gonna check the compression also
IDIBRONCO
IDIBRONCO
Yes. If an exhaust valve doesn't open or doesn't open far enough, then the rest of the air/fuel mixture that's still in the cylinder after it should have been pushed out, will be forced out the intake valve.
Is that common with the IDIs? I read about it a lot on the tdi forum - suppose nothing is exempt at a certain point though
The 6.9 that I drove years ago like to go through a fair amount of oil. Once in awhile I would forget to check it and it would start missing and blowing back through the intake. Stop and put in oil and it would clear back up with about a minute idle time. Lifters would bleed down and valves were not opening like they should. It was a well wore out engine guessing at least 300k could have been 400K.
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