Questions tagged [lean]
A condition where the air fuel ratio is not optimal and the engine is not receiving enough fuel from the fuel system
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1answer
62 views
What do you think of these spark plugs?
Still trying to diagnose an erratic positive fuel trims. Next step will be making sure that the lean condition i have is caused by less fuel delivered or weak spark not a vacuum leak. I pulled spark ...
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1answer
39 views
How can I diagnose if my engine is running lean or rich?
car is running poorly and wondering if it might have something to do with a lean or rich engine.
How can I diagnose this so that I know I am in the right direction and it is not one or the other?
I’m ...
1
vote
1answer
44 views
Motorcycle V-Twin CV carbs riding poorly on 1/4-3/4 throttle after carb rebuild
Background:
The bike Suzuki Intruder VS1400 model 2000, ran fantastic, but started to stall on idle when I used old fuel in it.
What I did:
I cleaned the two CV carbs. Didn't replace anything.
I found ...
1
vote
1answer
67 views
Spark Plug Deposits
So, I pulled the spark plugs today to check to see how the engine is running. After pulling all 6 spark plugs, I've noticed there is a white deposit caked onto the spark plugs. I doubt this is normal ...
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0answers
35 views
Engine feels like it will stall after Air/Fuel ratio sensor changed?
Got an 04 Acura TSX that's been baffling me for the couple of weeks. Accidentally bought an Upstream Oxygen sensor instead of the downstream so I thought might as well replace it since I have it (keep ...
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393 views
When second gear is engaged the car doesnt accelerate and engine doesnt rev up? audi a3 1.6 2005
I recently had a gearbox which went through the casing and needed to be refurbished. Had a new clutch replaced along with it. Once i picked the car up i began noticing that when the car goes into 2nd ...
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559 views
High LTFT (Long Term Fuel Trim) Reading
If someone can help me solving a lean condition issue, I'd appreciated!
I bought a 2002 Ford Focus ZTW (Zetec, at 100k miles) a month ago, and I noticed OBD2 always reads LTFT for both bank 1 and 2 ...
5
votes
2answers
119 views
Engine lean issues
Vehicle is a 2006 Ford Courier, started having hesitation/loss of power after fill up at a gas station that I'd never been to before.
I depend on it for transport so I'm forced to still drive it, ...
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0answers
224 views
Help me diagnose my lack of power & lean condition
I have a 2000 Mercedes CLK 320 with the M112 V6 engine at 125 000 kms. The car has rough unsteady idle and is lacking a lot of its power - to illustrate, 0-100 km/h takes exactly 10 seconds, while ...
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2answers
6k views
Help on diagnosing positive Long term fuel trim
My vehicle (Ford Fiesta 2014 Petrol) always have a positive long term fuel trim, which means its running lean mostly.
The log data that I recorded using torque pro can be downloaded here :
Torque Pro ...
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0answers
454 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
102 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 ...
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0answers
114 views
Emissions per mile of high MPG lean-burn gas-powered cars versus standard gas-powered cars
I am wondering if there have been studies or calculations of the NOx emissions per mile of high MPG lean-burn gas-powered cars versus standard gas-powered cars.
Honda made some great lean-burn cars ...
7
votes
1answer
3k views
Fuel Trim Readings
I have a 2002 Toyota Corolla (1ZZ-FE engine) and I am trying to understand the fuel trim values I am getting in real driving conditions from my scan tool. I have P0171 code (lean condition) that comes ...
5
votes
1answer
121 views
How much leaner can you responsibly run an old engine?
I've got a '76 Triumph TR7 and I was wondering this after I got its carbs tuned after its restoration. As many of you may know, old engines are initially not capable of running as lean as modern ...
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2answers
2k views
Can a permanently stoich or lean running engine ruin a catalytic converter?
It's known a cat can be burned by an engine running too rich for too long, but i wonder what the effects are of constantly running lean. Will the cat just be uneffective because of the lack of CO, or ...
12
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3answers
62k 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 ...
6
votes
1answer
202 views
2009 Aprilia RSV1000 - Piggy Back ECU, Should I get one?
I have an Aprilia Tuono, 2009. It seems to run lean after putting an Akrapovic exhaust on it. It makes exhaust popping sounds on deceleration. My boyfriend said I need a power commander on it to ...
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2answers
6k views
Strange surging and like it's going to stall, hesitant whilst idling
I have been having an issue with my Peugeot 207 (2008 model) 1.6L VTI petrol engine.
The cam cover was replaced by the garage but hasn't fixed the problem. I have lost faith in them. I have managed ...
24
votes
4answers
421k 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 ...