Weird fuel|trim values

Oddly behaving fuel trims and RPM - E46 Fanatics Forum

Ideally, the STFT should be between -5 and +5. Positive values indicate that the fuel delivery is being increased, while negative values ...

Bad short term fuel trim values. I think it's either EGR or o2 ... - Reddit

While it is idling, spray carb clean around areas that you suspect could be a vacuum leak and keep an eye on the trim value. Watch to see if it ...

Weird fuel-trim values: What do they mean..? - Toyota Nation Forum

The units on fuel trim values are percent, and can be positive or negative. Positive means it's adding fuel relative to baseline, and negative ...

High Positive Fuel Trim -sometimes- | Page 2 | BobIsTheOilGuy

With the engine idling, look at the Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) values. Normal range may be high as plus or ...

Strange Fuel Trim Values - Ford Truck Enthusiasts Forums

The fuel trim has two means of adapting; a Long Term Fuel Trim and a Short Term Fuel Trim. Long Term relies on the fuel trim tables and Short Term refers to ...

1.5T - Weird fuel trim values | 2016+ Honda Civic Forum (10th Gen)

For short fuel trims it is normal for them to go up to 20% plus or minus and for long term anything under 8% plus or minus is fine as well! I ...

Understanding Fuel Trim Theory and Operation - AutoSuccess

Short-Term Fuel Trim (STFT) values change rapidly and can bounce around quite a bit depending on engine load, speed, temperature and other ...

Understanding Short Term and Long Term Fuel Trims

If the displayed fuel trim value is a negative number, it means that the ECU is decreasing the injector pulse width to subtract fuel from the ...

Drivability Issues Fuel Trim Diagnostics - Tomorrows Technician

As loads are put on the engine, the (STFT) numbers increase or go more positive. If the driver goes off the throttle and brakes, the STFT will ...

Short Term and Long Term Fuel Trims Explained - YouTube

If you have a good understanding of how fuel trim works why and what will make the values change you can diagnose most drivability problems ...

SHORT TERM AND LONG TERM FUEL TRIMS - scannerdanner

The bottom line is you are looking for ZERO on both long and short term fuel trims. Positive numbers mean the engine is in a lean condition/rich command.

How messed up are my fuel trims at idle? - Quora

The MAF sensor overestimates airflow at idle, which causes the negative fuel trim values. It then underestimates airflow at cruising speeds, ...

Interpret fuel trim values - Maintenance/Repairs - Car Talk Community

Since your long term and short term are close to each other, you don't have an issue. Your engine is running efficiently. The STFT and LTFT do ...

Long-Term & Short-Term Fuel Trim - General Technologies Corp.

What are Normal Fuel Trim Values? ... Both LTFT and STFT can be positive (more fuel) or negative (less fuel) percentages. LTFT and STFT are added ...

What causes high fuel trim values? - Quora

High fuel trim, such as +10 % and higher is a lean INDICATION. Some folks oversimplify it by stating “lean condition” or “it is running ...

Very Strange Long And Short Term Fuel Trim (~ -100% up to ~100%)

Negative fuel trim numbers means that the fuel mixture is richer than expected and the PCM is decreasing injector pulse width to lean it out.

Fuel Trim is always positive? - Car Talk Community

No, zero is expected. A 145k mile 21 year old car a slightly positive STFT and LTFT would not be unusual. A weak fuel pump or fuel pressure ...

High Long Term Fuel Trim at Idle: Causes, Solutions & Ideal Levels

A positive number means computer is adding fuel and when it gets too high will set the lean code. Make sure you are only using regular fuel with ...

Diagnosing high positive fuel trim | Toyota Nation Forum

Regarding fuel trim values, around plus /minus 10 is considered to be normal for older vehicle. Probably won't find a fix for slightly high ...

Are these fuel trims normal? | BimmerFest BMW Forum

Old ones becomes slow and sluggish and affects fuel economy as well as not showing correct values. They dont last the lifetime of the car ...