t2 lean going into boost im puzzled!
#1
OK i am truely puzzled i have no clue what this could be...
Details on car
87 T2 w/
moderate street ported s4 t2 motor
Rtek 1.7 + 720cc injectors
walbro 255 fuel pump
3" ehxuast and 3" intake.
ported waste gate on stock turbo.
emissions removed. ( and no 02 sensor wide band currently in place for testing)
NGK AFX wide band
Autometer boost gauge.
OK so if i barly give it gas around town it runs fine air fuels seem to go fairly rich at real light throttle 12's and then around 14-15 around light throttle ( which is fine with no o2 sensor)
BUT if i try and get on it ( 1/4th throttle or more) at say 2500 rpm or more it either stays lean and starts bogging/missing as i aproach boost( like -5 vacume or so) and af will peg out my wide band at 16:1
or a/f start droping down like they should for a second or two enuf to make it start spooling good and i get into a few pounds and then the a/f start leaning right back out toward 15:1, and then it starts missing/bucking/detonating/god knows what again.
now i know a miss will show a full lean but the a/f is quite lean before it starts missing it seems like the a/f just dont seem drop down like they should when getting on it.
ive replaced/swaped or have tested
fuel filter
had injectors flow tested
rtek 1.7 ecu
air flow meter
boost sensor( stock gauge works fine, ive done a test with no boost sensor same result)
air intake sensor
water temp sensor
TPS
leading coil pack
fuel pump + checked voltage and wired pump for high voltage at all times.
new spark plugs bur9eq all around.
checked timing
now ive tried getting on it for a few seconds at higher rpm like 4K and it gets quite lean as well and can bog hesitate ect at a/f around 14's going into boost (SCARY!!)
im worried im going to blow the motor so i need to figure out what this problem is
Could the street port cause such lean conditions i would think the AFM would see the increase of airflow and compensate??
im puzzled any input would help.
Details on car
87 T2 w/
moderate street ported s4 t2 motor
Rtek 1.7 + 720cc injectors
walbro 255 fuel pump
3" ehxuast and 3" intake.
ported waste gate on stock turbo.
emissions removed. ( and no 02 sensor wide band currently in place for testing)
NGK AFX wide band
Autometer boost gauge.
OK so if i barly give it gas around town it runs fine air fuels seem to go fairly rich at real light throttle 12's and then around 14-15 around light throttle ( which is fine with no o2 sensor)
BUT if i try and get on it ( 1/4th throttle or more) at say 2500 rpm or more it either stays lean and starts bogging/missing as i aproach boost( like -5 vacume or so) and af will peg out my wide band at 16:1
or a/f start droping down like they should for a second or two enuf to make it start spooling good and i get into a few pounds and then the a/f start leaning right back out toward 15:1, and then it starts missing/bucking/detonating/god knows what again.
now i know a miss will show a full lean but the a/f is quite lean before it starts missing it seems like the a/f just dont seem drop down like they should when getting on it.
ive replaced/swaped or have tested
fuel filter
had injectors flow tested
rtek 1.7 ecu
air flow meter
boost sensor( stock gauge works fine, ive done a test with no boost sensor same result)
air intake sensor
water temp sensor
TPS
leading coil pack
fuel pump + checked voltage and wired pump for high voltage at all times.
new spark plugs bur9eq all around.
checked timing
now ive tried getting on it for a few seconds at higher rpm like 4K and it gets quite lean as well and can bog hesitate ect at a/f around 14's going into boost (SCARY!!)
im worried im going to blow the motor so i need to figure out what this problem is
Could the street port cause such lean conditions i would think the AFM would see the increase of airflow and compensate??
im puzzled any input would help.
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