View Full Version : Running rich!

07-18-2012, 03:03 PM
99.5 A4
Mods are gt2871r running about 20psi.
440cc UNI tune
440cc delphi inj.
3 bar USRT regulator
3" vr6 MAF housing with stock element.
Stock fuel pump and unknown miles on fuel filter.

When I go WOT my AFR gauge reads 10.0, and I leave behind a black smoke show, she sometimes backfires 2 or 3 times in a row between shifting and also when the engine is warmer it sometimes is hard to start and ill have to crank it a few times. Any ideas that can help me out?

07-18-2012, 03:18 PM
id maybe check the fuel pressure regulator

07-18-2012, 03:26 PM
By just buying a gauge?

07-18-2012, 04:22 PM
could be a bad o2 sensor

07-19-2012, 02:21 PM
I was thinking that recently but have no other symptoms like a CEL.

07-19-2012, 02:54 PM
do some logs see how the o2 is reacting. it doesn't necassirly have to throw a check engine.