Reply With QuoteHi,
You think you can outsmart computer unless you rewrite the firmware?
Tampering with emmission stuff is illegal strictly speaking.
Tony
howard B. wrote:
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Subaru: subaru blow off valve check engine light
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- 11-15 12:33 AM #1howardGuest
subaru blow off valve check engine light
I modified my oem blow off valve to vent to atmosphere just too see if
i like the result. I have a check engine light on after a few hours of
running my car in this configuration. Is this common with all
vta-blv's?. i plan to restore my car to oem spec. asap and i hope this
will fix the problem. any info will be nice.
hjbunger.
- 11-15 01:49 AM #2TonyGuest
Re: subaru blow off valve check engine light
- 11-15 04:06 AM #3SpudsterGuest
Re: subaru blow off valve check engine light
"Tony Hwang" <ca> wrote in message
news:Wugtb.392032$..
Take a valium! You're giving us Western Canadians a bad name with responses
like this. Somebody piss in your cornflakes this morning?
Lots of people like to tinker... that's how things improve over time.
A blow-off valve is not "emmision stuff". It is there to relieve pressure in
the intake manifold on a turbo engine after a sudden throttle closing to
prevent damage to the compressor and other intake tract components. It will
cause a momentary rich condition on gear change if vented to the atmosphere
instead of back to the turbo inlet hose downstream of the MAF sensor. Why
would you assume Howard was not going to "rewrite the firmware" through one
of the currently available ECU re-flash systems offered by ECUtek or Cobb's
AccessECU?
Spud.
- 11-15 05:51 AM #4TonyGuest
Re: subaru blow off valve check engine light
Hi,
CE light coming on, what does that supposes to mean? If you don't know
anything about anything, be careful. I worked on systems where big 3
used to design their stuffs before I retired. Probably I know lot more
than you may guess. I am just had enough of it and don't get my hands
greasy any more.
Of course you can tinker and learn but some times the price can be very
expensive.
Tony
Spudster wrote:
- 11-15 01:44 PM #5howardGuest
Re: subaru blow off valve check engine light
Tony Hwang <ca> wrote in message news:<32ktb.394277$9l5.101965@pd7tw2no>...
Guys,
thanks for the info, rewrite the firmware?. whats that like?. well i
re installed the BLV to JDM spec and now i have a quite car again. i
like that better, but still the CE light persists. My partner who has
a 2002 sonata gls v6 says that the computer will clear out after 20
starts. is this true?. OH and yes i dont know anything about anything
so be gentle with me and type slow, ha ha.
- 11-15 05:17 PM #6TonyGuest
Re: subaru blow off valve check engine light
howard B. wrote:
Hi,
Probably that meant, incident log clearing. It can't hold indefinite
number of incidents due to size of memory. If you want to reset the ECU,
just remove battery NEG cable for a few minutes. It'll reset and relearn
everything. Hope CE light goes off too.
Tony
- 11-15 09:29 PM #7DavidGuest
Re: subaru blow off valve check engine light
Well - the problem with venting to atmosphere with a BOV on a WRX, rather
than maintaining the OEM diverter valve setup is that WRX is a MAF
controlled car - the ECU meters the fuel which is delivered based upon how
much air has passed through the intake - when you run a BOV, you are venting
some of that air, but the ECU is not aware of it, so it still delivers fuel
based upon how much air it has seen pass the MAF - as a result, the car will
run rich under situations when the BOV vents - now, in normal driving, that
probably doesn't mean too much - you just dump a little extra fuel through
the system now and then - probably won't cause any problems. However, the
harder the turbo is working when you shift, the more air which is vented,
and thus the richer the car runs - raw fuel will make it into the exaust
stream, and the first thing it hits is the catalytic converter in front of
the turbo (in the up-pipe) - some will also make it through to the other
cats - the raw fuel makes the cats increase in temperature, and can kill one
(they generally melt down and disintigrate... not a good thing if the one in
the up-pipe does that...
Anyway - the CEL could be anything from cat ineff. to an overtemp on
something - get the code pulled. (I seriously doubt you hurt anything after
a few hours)
There are really only two reasons to add a BOV - either you are running a
higher boost than the stock diverter valve can handle (somewhere around
19psi, from what I have read) or you really like the sound a BOV makes (they
usually route the air through a whistle of some sort, so that they make lots
of noise) and don't care about potential damage to the system.
"howard B." <com> wrote in message
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