engine running super rich? 4age

crjmonn · 05-19-2009, 05:19 PM

ya my exaust is always blak-failed emissions but not smoke?

palos · 05-19-2009, 06:07 PM

The oxy sensor is a possibility. Check to see whether you are getting the oscillating signal.

The other is the air flow meter. Recently on my MK1, I had to remove the plastic cover on the air flow meter and increase the spring tension for the butterfly valve.

Essentially, the valve was opening all the way with only a small amount of throttle. I initially turned the toothed gear 15 teeth clockwise, but that ended up being too much. (The car had no top end.) I then went back 6 teeth counter-clockwise. At the e-test facility, we ended up settling on 2 more teeth clockwise to pass the test.

The car drives quite different and I'm not certain I'll keep it at its current setting.

Timon · 05-19-2009, 10:32 PM

^ I'd suggest leaving that stock and drilling out the cap covering the air/fuel mixture screw.

Papo J · 05-20-2009, 12:10 PM

Test the O2 sensor, thermo time switch for the cold start injector and coolant temp sensors, each of those will mess up your mileage if they fail.

05-19-2009, 05:19 PM	#1 (permalink)
crjmonn Some Skills Join Date: May 2009 Location: new jersey Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	engine running super rich? 4age ya my exaust is always blak-failed emissions but not smoke?

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05-19-2009, 06:07 PM	#2 (permalink)
palos … Join Date: Apr 2009 Posts: 546 Thanks: 0 Thanked 44 Times in 42 Posts iTrader Rating: (0/0% )	The oxy sensor is a possibility. Check to see whether you are getting the oscillating signal. The other is the air flow meter. Recently on my MK1, I had to remove the plastic cover on the air flow meter and increase the spring tension for the butterfly valve. Essentially, the valve was opening all the way with only a small amount of throttle. I initially turned the toothed gear 15 teeth clockwise, but that ended up being too much. (The car had no top end.) I then went back 6 teeth counter-clockwise. At the e-test facility, we ended up settling on 2 more teeth clockwise to pass the test. The car drives quite different and I'm not certain I'll keep it at its current setting.

05-19-2009, 10:32 PM	#3 (permalink)
Timon MR2 MKI AW11 Join Date: Feb 2008 Location: Utah Posts: 669 Thanks: 13 Thanked 42 Times in 37 Posts My Google Map iTrader Rating: (1/100% )	^ I'd suggest leaving that stock and drilling out the cap covering the air/fuel mixture screw.

05-20-2009, 12:10 PM	#4 (permalink)
Papo J 6SPD GTE Join Date: Sep 2006 Posts: 591 Thanks: 2 Thanked 50 Times in 49 Posts iTrader Rating: (0/0% )	Test the O2 sensor, thermo time switch for the cold start injector and coolant temp sensors, each of those will mess up your mileage if they fail.