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Old 12-27-2012, 10:54 PM   #1
300zxturboftw
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Member#: 325461
Join Date: Jul 2012
Chapter/Region: MWSOC
Location: Earth
Vehicle:
2003 WRX
WRB Rotated 35r

Default Odd low throttle issue

I have a rotated 35r EJ257 and I'm having this intermittent problem...

Cruising with about 10 % throttle the AFR's lean out to where its like there is fuel cut when engine breaking (AEM AFR Gauge Reads ---) but vacuum is still pulling about -10 hhg as well as a loss in power like its missing in 1 or 2 cylinders. If I increase throttle or when rpm's reach around 3k rpm + the AFR gauge comes back to 14.7 and power returns to normal.

This is completely random. Sometimes I will have the issue 1 day and not have it reappear for a week. Sometimes it happens multiple times a day. This is why I'm so stumped on the issue.

Anyone have a similar issue? Battery & alt are pulling correct voltages.

No CEL's, and I've gotten them on spark misfire under heavy boost so I know it exists, but would it go off on light load misses?
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Old 12-28-2012, 02:11 AM   #2
stretchedk7
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Join Date: Jan 2008
Location: j-ville fl
Vehicle:
06 Wrx RWD Auto
76MM-AEM-2200's

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Does the car have an aem ecu in it? Either way sounds like possibly a tuning issue.
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Old 12-28-2012, 02:26 AM   #3
Uncle Scotty
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OK Houston
we have an Uncle

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that or maybe a vac leak in the evap system maybe.....valve opens and ya lean out and *p00f*
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Old 12-28-2012, 10:03 AM   #4
300zxturboftw
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2003 WRX
WRB Rotated 35r

Default

I have opensource. I don't think it's a tuning issue because of the spontaneity of the issue. I'll try a smoke test or boost leak down test with the compressor. Just seems too odd for a vac leak too, but who knows.
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Old 12-28-2012, 10:11 AM   #5
stretchedk7
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06 Wrx RWD Auto
76MM-AEM-2200's

Default

Which makes sense. Next option would be the vacuum leak idea ^.
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