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Questions tagged [rich]

A condition where the air fuel ratio is not optimal and the engine is receiving too much fuel from the fuel system

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BMW M140i showing P0172

Details of the car: BMW M140i (F20) B58 engine - 3.0L petrol, inline 6, turbocharged Year of manufacturer: 2016 Mileage: ~13000 miles (3000 of which are mine) The majority of my use is short trips (...
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0answers
191 views

p0140 and p0172

I have a 2005 Elantra (205K miles). I replaced the second o2 sensor (downstream; after cat), added a defouler to second o2, replaced cylinder # 2 injector, air filter, tune-up. If the car is at idle ...
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2answers
1k views

Unexplained Low LTFT on my Mazda cx7 2.3 turbocharged

So, it started when i got CEL with code p0172: system too rich bank1. I took the car to the mazda dealer, they said you need to replace MAF sensor. I agreed and got the new sensor installed. Now CEL ...
2
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1answer
11k views

Black water from exhaust, cylinder misfire and rought idle

It is a Skoda Fabia 2006, petrol, 3cylinders 1.2L. Main problem: Rough idle. Misfire at random cylindners. Steam, Water and black carbon from exhaust. (I'm sure it is not normal). Undrivable. ...
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0answers
396 views

2 Stroke 70CC Scooter Engine

I own a scooter which I blew the engine in Dec 2016. I since replaced the defective parts in it and it now runs great aside of one thing: Bottom end of the throttle is slugish (I'll elaborate) It ...
5
votes
2answers
93 views

Is there a chemical limitation to the mixture an engine can maintain?

I know that the question/title is a bit ambiguous, but I couldn't wrap it in a single sentence, so please let me elaborate. You can change the mixture of an engine for whatever reason. Because of ...
12
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3answers
44k views

What's the meaning of a “lean” vs “rich” air fuel mixture

I'm learning about vacuum leaks on engine intakes and I'm hearing this terminology of lean air fuel mixture. I thought I heard of a rich mixture before too. What's a normal mixture referred to as? A ...
7
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2answers
1k views

Exhaust Backpressure and Its Impact on LTFT Values

This is a follow-up from my initial question which can be found here : LTFT and STFT values are off and don't make sense. Car : BMW 2015 F10 M5 Modifications : Eisenmann Race Catback Exhaust, ...
24
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4answers
373k views

Symptoms of Lean or Rich carb settings on a motorcycle

I have a 1981 Yamaha XS650. I recently put in K&N stock replacement filter (ie, they are in the airbox and conform to the size of the original), however they may be leading to a leaner mixture ...