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Running super lean on acceleration
I've had an all-of-a-sudden problem happen. My car has always run a bit on the rich side on acceleration. At idle o2 is flipping back and forth like normal, under light accel it stays flipping like normal. Anything over 30% throttle it drops like a rock. And it stays lean until you come back to cruising or idle.
I thought at first it was a faulty A/F guage, then my cel came of for Lean Bank 1 and Fuel Trim Bank 1. The part that really has me confused is that watching with my scanner, my fuel trims are never more than 10% +/-. and ussualy very close to zero. I have tested and inspected everything I can think of.
MAF- frequency and voltage are fine, I did replace it with a good used part just to be sure, same problem.
MAP- voltage is fine
No boost or vaccum leaks
O2 tests ok, forced it rich with propane
Fuel pressure tests ok
The only thing I can think of is the engine computer isnt reading something right, or isnt applying the right fuel metering. I'm ready to start this thing on fire.
96 Talon Tsi AWD Auto
Vehicle mods-
Small 16g
MBC
3" turbo back exhaust, high flow cat, magnaflow muffler
Cold air intake
I know I need a wideband, bigger injectors and an AFC, thats in the works. But I want to get it running properly again befor I start bumping any more out of this.
I've been running this car at about 13psi since I swapped the turbo out and its been runnin perfect. All of these mods have been on here for 6 months or so and this problem has just started in the last week. I turned the MBC down to stock to see if that was my problem, to no avail. For now I'm just leaving the boost down since its running so lean.
Any help you guys could give would be awesome.
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