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2002 TT Fixed Vacuum leak...now misfiring

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2002 TT Fixed Vacuum leak...now misfiring

Old 11-07-2009, 10:12 PM
devereau_x's Avatar
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Join Date: Nov 2009
Location: Phoenix, AZ USA
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Default 2002 TT Fixed Vacuum leak...now misfiring


2002 TT Convertible 180hp____76,xxx miles____5Sp

CEL with 2 codes pointing to vacuum leak(P0171 and another...can't remember).
1. Found the leak (single hose coming from brake booster > splitting to 2 into the intake) and replaced the hose with OEM part.
2. Erased codes
3. Started engine and ran for about 2 minutes.
4. NO CEL, but got 2 pending codes for cylinder 2 & 4 misfiring(P300 & P200).
5. Erased both codes and was CEL free for about 20 miles....NOW I'm back to a fresh CEL with P0171 AGAIN(Too lean on bank 1.) P300 % P200 don't show up at all any longer.

Before replacing the cut hose the engine, when started cold, would run rough and loud for about 3 minutes then calm to a smooth symphonic purr. AFTER replacing i get small almost undetectable farts and burps, especially if i rev up and as it drops under 2000rpm.
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