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Author Topic: Lean After 5200 rpm  (Read 17575 times)
vdubnation
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« on: May 04, 2013, 07:21:28 PM »

Been working on the car and i ve run into another hardware issue the car runs super lean only after 5200 rpm in 3rd gear only

1st and 2nd are 100% ive got a steady afr of 10.9 during 1 & 2

i ve swapped fuel pumps between 2 brand new 044 bosch pumps i ve got brand new stainless lines straight to my ie billet rail on deka 630's

no idea whats causing this can someone point me in a direction

short clip of whats happening

http://www.youtube.com/embed/p-fpXiHzEUI


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nyet
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« Reply #1 on: May 05, 2013, 02:45:30 AM »

possible vac leak post maf, pre-inlet?

i.e. sucking in unmetered air.
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vdubnation
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« Reply #2 on: May 05, 2013, 10:52:24 AM »

Gonna smoke and presure test again
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krazydbiker
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« Reply #3 on: May 05, 2013, 02:11:26 PM »

if it was running that lean i would expect a power loss, or detonation, is this happening? i have run into issues where the AEM sensor goes bad and does that same thing

im not sure if yours is narrowband or wideband? logs would help
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vdubnation
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« Reply #4 on: May 05, 2013, 03:25:31 PM »

graphs
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userpike
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« Reply #5 on: May 05, 2013, 10:41:25 PM »

you sure this happens only in 3rd gear?
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vdubnation
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« Reply #6 on: May 06, 2013, 07:42:27 AM »

I ll make a video of going through gears its perfect through 1 and 2
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phila_dot
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« Reply #7 on: May 06, 2013, 07:58:19 AM »

Where's the wideband mounted?

Edit: also, you're running a 1.5 points richer than target, then suddenly off the charts lean?
« Last Edit: May 06, 2013, 08:03:56 AM by phila_dot » Logged
userpike
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« Reply #8 on: May 06, 2013, 09:45:31 AM »

I ll make a video of going through gears its perfect through 1 and 2

make vid of higher gears 3rd up then. just say in the vid its on a closed course in "Mexico" lol

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ddillenger
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« Reply #9 on: May 06, 2013, 09:48:41 AM »

I'd think if it were actually going lean it'd show in the timing CF's.
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vdubnation
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« Reply #10 on: May 06, 2013, 10:01:25 AM »

make vid of higher gears 3rd up then. just say in the vid its on a closed course in "Mexico" lol



i have to do it super late tonight if the weathers nice due to 4th being over 130+
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krazydbiker
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« Reply #11 on: May 06, 2013, 12:24:46 PM »

i agree with dillenger, anytime I have lost fuel pressure, and or been way to lean, there was a ton of knock, a huge loss of power, according to that gauge you were past 16.0 which I think is that gauges range.... where is it located?
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vdubnation
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« Reply #12 on: May 06, 2013, 01:38:30 PM »

me or the gauge location ?
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phila_dot
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« Reply #13 on: May 06, 2013, 02:18:27 PM »

me or the gauge location ?

Where is the sensor mounted (my question from above)?
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vdubnation
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« Reply #14 on: May 06, 2013, 02:33:30 PM »

not my exhaust setup just for visualization 

sensor location on my down pipe on the top portion so that minimal condensation builds up when powering down
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