What problems to expect from BOV?
Thread Starter
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2nd Gear
Joined: May 2005
Posts: 1,392
What problems to expect from BOV?
Hey Guys,
I posted last week about a code (P0411) that i was getting...
Anyway, much to my horror I find when i go to replace the DV the previous owner had install a horribly nasty looking BOV
I've replace it with a hyperboost DV now, but should I expect to see any issues that may be related to the BOV being installed for so long?
I guess it would also explain why it sounded like my engine was falling out of the car when shifting quickly at high RPMs
I havent taken the car out yet since installing the new DV but it already sounds much better, I think the BOV was stuck lightly open or something.
Oh well, my 1st DIY mod has been completed (if you can really call it a mod and not just maintenance heh)
Site Moderator
Joined: May 2003
Posts: 3,927
From: Indianapolis, IN
RE: What problems to expect from BOV?
Good job in replacing the BOV with a DV. I doubt you will see any issues now that you have replaced it, unless the damage has already been done. Might want to check you plugs to see if they are fouled. Smell the exhaust to see if it smells like eggs.
2nd Gear
Joined: Mar 2005
Posts: 1,091
From:
RE: What problems to expect from BOV?
Also if the cat is going bad you would have a power loss, the thing would be glowing red ( more than just the normal glow of the turbo), and possibly a check engine light if the O2's s ense anything.
Good job on the DV.
Good job on the DV.
Thread Starter
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2nd Gear
Joined: May 2005
Posts: 1,392
RE: What problems to expect from BOV?
I'll take the plugs out on the weekend and check them, or just have them replaced when it goes in for service sometime in the next week or 2.
There is no eggy smells which is cool!
4th Gear
Joined: Oct 2004
Posts: 5,441
From: Chicago Burbs /// KOTH 06'
RE: What problems to expect from BOV?
as Imola put it..
The Audi turbo system is a closed loop system by which all unused boost that is spooled during off throttle and gear shifts must be re-routed within the system; it cannot be vented to the atmosphere due to the dependence on the MAF and ECU to properly read and interpret air flow dynamics within the intake tract. Therefore BOV's (Blow-Off Valves) are not used because they create a rich air/fuel condition (i.e. less air to fuel ratio) which will damage the catalytic converter, create soot on the exhaust pipes, and cause occasional misfiring (due to the purged air) which will result in ECU miscalculated timing adjustments and other errors.
For Audi closed loop turbo systems, a BPV (By-Pass Valve) or DV (Diverter Valve) is needed to recirculate the purged air and keep it within the intake tract.
For Audi closed loop turbo systems, a BPV (By-Pass Valve) or DV (Diverter Valve) is needed to recirculate the purged air and keep it within the intake tract.
1st Gear
Joined: Apr 2005
Posts: 85
RE: What problems to expect from BOV?
I emailed the giac place I take the A4 to, and I asked them about installing a Bailey DV (the $150 one), and this is what they said :
> > >We do not stock the Bailey DV. We have found that a lot of the
metal
> > >DV's when they get hot the piston sticks. That is why we prefer to
>use
> > >the Bosch Sport DV that is used on the Porsche 996TT turbo cars. It
>is
> > >still a rubber diaphragm style but it doesn't run the risk of
>sticking
> > >and having to be taken apart and lubed periodically.
The thing about the piston sticking dosent sound too good.
> > >We do not stock the Bailey DV. We have found that a lot of the
metal
> > >DV's when they get hot the piston sticks. That is why we prefer to
>use
> > >the Bosch Sport DV that is used on the Porsche 996TT turbo cars. It
>is
> > >still a rubber diaphragm style but it doesn't run the risk of
>sticking
> > >and having to be taken apart and lubed periodically.
The thing about the piston sticking dosent sound too good.