General advice on Timing Belt Service
09-16-2013, 03:51 PM
#31
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From all the research (post purchase, of course) sounds like the 3.0 engine is a dud. That said...if this were you're car at 12 yrs old and ~ 90K miles would you start digging? Or would you just drive it.
Could you imagine replacing a cam shaft and rebuilding a head in one of the cylinder banks just to have the same thing happen (completely related) in the other cylinder bank in 6 months or a year?
This is very interesting to me. Thanks for all the thoughts.
Could you imagine replacing a cam shaft and rebuilding a head in one of the cylinder banks just to have the same thing happen (completely related) in the other cylinder bank in 6 months or a year?
This is very interesting to me. Thanks for all the thoughts.
09-16-2013, 04:30 PM
#32
AudiWorld Super User
3.0 a dud?
Naw, your just reading posts on a small percent of cam lobe wear problems probably caused by lack of proper oil changes or proper oil.
As always the usual members dog this engine without even owning one, I know three Audi owners who have a 3.0 "no major problems" including myself in a 04 A6 with 84k "no problems" so far. The best advice I can share as it stands with any car is age can be more wearing than miles as seals and bearing grease degrades relative to the TB service parts, so before you do a full TB service pull those VC's and check the exhaust cams and tappets before you move forward.
Good Luck!
Like a dog I have to defend something again, so it be said.
As always the usual members dog this engine without even owning one, I know three Audi owners who have a 3.0 "no major problems" including myself in a 04 A6 with 84k "no problems" so far. The best advice I can share as it stands with any car is age can be more wearing than miles as seals and bearing grease degrades relative to the TB service parts, so before you do a full TB service pull those VC's and check the exhaust cams and tappets before you move forward.
Good Luck!
Like a dog I have to defend something again, so it be said.
09-16-2013, 05:13 PM
#33
AudiWorld Super User
It means that you bent valves on one cylinder. This cylinder is not working, and you're driving on 5 cylinders. Your power will be down, at least part of the time, and your gas mileage will suffer.
IF that is your issue, to fix it requires removal of the cylinder head and rebuilding it.
This is a somewhat common failure on the 3.0 engine.
Get the car to the indy ASAP and figure out why the misfires first. And get a quote for teh head rebuild (if that's what it is) and the TB service, and then decide if you want to invest $2.5K+ into this car.
IF that is your issue, to fix it requires removal of the cylinder head and rebuilding it.
This is a somewhat common failure on the 3.0 engine.
Get the car to the indy ASAP and figure out why the misfires first. And get a quote for teh head rebuild (if that's what it is) and the TB service, and then decide if you want to invest $2.5K+ into this car.
I would expect misfires as it backfires through the intake .
Last edited by Airbag; 09-16-2013 at 05:37 PM.
09-16-2013, 05:40 PM
#34
You do not have any bent valves. None. Zero. Nada.
You probably have issues with the cams being worn, the worst issue with the 3.0.
Someone needs to remove the valve covers and inspect the damage. Honestly, you are looking at big money here. I would strongly consider sending this car back to action and finding a nice 2.7 or 4.2.
09-16-2013, 05:42 PM
#35
Naw, your just reading posts on a small percent of cam lobe wear problems probably caused by lack of proper oil changes or proper oil.
As always the usual members dog this engine without even owning one, I know three Audi owners who have a 3.0 "no major problems" including myself in a 04 A6 with 84k "no problems" so far. The best advice I can share as it stands with any car is age can be more wearing than miles as seals and bearing grease degrades relative to the TB service parts, so before you do a full TB service pull those VC's and check the exhaust cams and tappets before you move forward.
Good Luck!
Like a dog I have to defend something again, so it be said.
As always the usual members dog this engine without even owning one, I know three Audi owners who have a 3.0 "no major problems" including myself in a 04 A6 with 84k "no problems" so far. The best advice I can share as it stands with any car is age can be more wearing than miles as seals and bearing grease degrades relative to the TB service parts, so before you do a full TB service pull those VC's and check the exhaust cams and tappets before you move forward.
Good Luck!
Like a dog I have to defend something again, so it be said.
09-16-2013, 05:59 PM
#36
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There are numerous possibilities but continued use can easily do irreparable damage to the head as well as risk a catastrophic failure if the bent valve moving through the valve guide stresses it enough for the guide to destruct.
09-16-2013, 06:09 PM
#37
AudiWorld Super User
Well, save some money and labour on that!
So to replace the cam (if that's the issue), does the head need to come off?
09-16-2013, 06:11 PM
#38
AudiWorld Super User
No. Not too much different than the operation to change the tensioner seals actually. I imagine a few bucks tho.
09-17-2013, 08:33 AM
#39
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Well after spending a few hours on the forums this morning troubleshooting the stumble at idle and the cylinder misfires, and it sounds like it could be a combination of:
vacuum leak
catalytic converter
worn cam lobe
bad lifter
bent valve(s)
that timing belt skipped a tooth or two
wiring harness for the coil packs
camshaft position sensor (though no specific codes)
MAF sensor (though no specific codes)
With my luck its multiple things, and probably several thousand dollars of investment. I only paid $3300 for it. I still want to do the TB service.
I did reset all the codes today, so I'll give it a few days of driving and run a check again and see what codes come around. I'll let you all know. Much appreciate everyone's input.
vacuum leak
catalytic converter
worn cam lobe
bad lifter
bent valve(s)
that timing belt skipped a tooth or two
wiring harness for the coil packs
camshaft position sensor (though no specific codes)
MAF sensor (though no specific codes)
With my luck its multiple things, and probably several thousand dollars of investment. I only paid $3300 for it. I still want to do the TB service.
I did reset all the codes today, so I'll give it a few days of driving and run a check again and see what codes come around. I'll let you all know. Much appreciate everyone's input.
09-17-2013, 08:36 AM
#40
AudiWorld Super User
