89 turbo supra 5 speed dies in mid shift????

[jtown125]

My supra is dying in the middle of a shift. The idle is good, is doesn't die any other time. It only seems to die when it drops from a higher rpm to a lower one...it just doesn't seem to catch back at idle all the time. No check engine light. Any suggestions?

89 turbo supra 5 speed...
new motor with about 6,000 miles on it.
rebuilt tranny as well...

[jtown125]

acutally I just got to looking back at the original post of the problem when it first happened...which happend to be last april.

Im 80% sure that its the BOV due to the fact of all the boost buildup between shifts.

Oh, and it isn't throwing any codes btw.

But, my options....

Get a new BOV, but will that fix the problem? Is the problem that it is releasing the build up air too fast or that it isn't releasing the air like it should?

Bypass valve...

or OEM stuff...which is horrible....

[btwilson86]

Is it an aftermarket BOV venting to atmosphere? If so, then that's very likely the cause of your problems. It isn't that the air isn't released properly, the problem is that the computer is expecting that air to still be in the system (because of the factory BPV). Since the air isn't there, the engine runs extremely rich during shifts, and this can be enough to stall the engine.

[jtown125]

@btwilson...
in my original post last april you were the one who suggested that it was the aftermarket blow off valve...
Question: It is an older type blow off valve not a ssqv.
From what I read, the newer style valves allow for the air not to completely escape unless under extreme load.
So, my question is will a newer style bov help out any?

I don't want to go back to the OEM style, I would rather go with an aftermarket bypass valve.

Also, in the original post I said in my last post that I had reset the computer and I had no problems out of it....until now....
ten months later... which confuses me beyond all belief...

I reset the computer last night and took it out with no luck...

I have a really retarded question too:
If I was to take it too a shop and get them to tune it to where the timing was retarded a little would it make up for the stall?????
The car runs extremely rich in the first place....

[cre]

ROFL..... you really should stop asking for advice if you're just going to ignore it.

You have a couple options: Ditch the BOV for a BPV. Connect a BOV AND a BPV OR find a dual outlet BPV which will recirc one of the two ports and blow off the other at the same time.... they *help* for half the build and for the other half they don't make a difference... they're pretty hard to find and I think they're pretty expensive. The only other option is to buy a fuel controller with throttle tip-in and tip-out tuning and get the system tuned for it.

Timing isn't going to do shit but cost you more power and has absolutely NOTHING to do with how much fuel the ECU thinks the engine needs. No, newer BOVs do not let out any less or more air than older ones... it depends entirely on how the BOV is tuned (if it's adjustable; a feature even many old ones had). There isn't a design out there that I know of that is so vastly different that I'd believe that line of crap.

[jtown125]

@cre...

this is the bov that is on my car

if its adjustable, i don't know how to.

I was wrong in the earlier post it is a ssqv bov, just a older discontinued item.


http://www.streetunit.com/HKS_SSQV_B...1421-sa001.htm