9krpmrx8's Boost Build Thread
#1726
Registered
iTrader: (3)
be very carefule with misfires in that rpm range and you know why.
the apv runners are not fed by any of the injectors--so how are your a/f's --normal?
There is one test I know of that will verify that the apv's are stuck open.
Accelerate the engine --let off the throttle and watch your vacuum gauge. If the apv's are open your 30 psi vacuum gauge should/will peg. If it only goes to 24-26 then the apv's are closed. If they are stuck open --on decl you are getting a LOT of very hot air back into the LIM and uim.
Ask me how I know this
the apv runners are not fed by any of the injectors--so how are your a/f's --normal?
There is one test I know of that will verify that the apv's are stuck open.
Accelerate the engine --let off the throttle and watch your vacuum gauge. If the apv's are open your 30 psi vacuum gauge should/will peg. If it only goes to 24-26 then the apv's are closed. If they are stuck open --on decl you are getting a LOT of very hot air back into the LIM and uim.
Ask me how I know this
#1727
Turbo Member
iTrader: (10)
Scott, I assume that the misfires are coming from light throttle? No boost?
The APV being stuck open would cause some very disrupted afr values.
I can tell you that I was getting misfires too when I first loaded the stock map. This was solved with tuning. I was not getting any codes for the apv though.
The APV being stuck open would cause some very disrupted afr values.
I can tell you that I was getting misfires too when I first loaded the stock map. This was solved with tuning. I was not getting any codes for the apv though.
#1728
SARX Legend
Thread Starter
iTrader: (46)
Yeah these are happening at light throttle, I'm not revving past 3,000 RPM or so and I have not hit boost. Hopefully it's tuning. I am still getting a bit of smoke at start-up hopefully it's residual junk in the exhaust because it smells nasty. I tightened up the BOV, it was at a really soft setting. I was thinking maybe and vacuum leak somewhere but it idles perfectly.
#1743
Turbo Member
iTrader: (10)
... you can always try to clean the sensor. if you lift up the car and slide under you can see it quite easily.
If the sensor was reading wrong you would have a terrible idle too, which is why I doubt that's what it is.
#1744
SARX Legend
Thread Starter
iTrader: (46)
I am not sure how you could diagnose that without being there, nor do I know why you think it would be that.
... you can always try to clean the sensor. if you lift up the car and slide under you can see it quite easily.
If the sensor was reading wrong you would have a terrible idle too, which is why I doubt that's what it is.
... you can always try to clean the sensor. if you lift up the car and slide under you can see it quite easily.
If the sensor was reading wrong you would have a terrible idle too, which is why I doubt that's what it is.
#1748
SARX Legend
Thread Starter
iTrader: (46)
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