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# Calculating compensation for improvement? - RTO Scuba Diving & Snorkeling

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### A simple way to find my fuel balance

If your vehicle (you didn't mention model, make, or year) has an ECM/PCM, it is calculating and trying to deliver a ratio of 14.7 (plus or minus .05) to 1 of air and fuel. It does this by measuring the air flow (with MAF and/or MAP sensors, coolant temperature sensor, IAT sensor, and TPS sensor), and controlling fuel injector pulse width and spark timing to meter the proper fuel delivery for the conditions.
Using the OBDII tool, you can see either the actual ratio (few vehicles) or the fuel trims that your ECM/PCM sees. If the fuel trim (combined short term and long term) shows a positive number, the engine is tending to be lean and the ECM/PCM is compensating for that. If the fuel trim is showing negative, the ECM/PCM is compensating for a rich tendency. The ECM/PCM gets its information from the heated O2 sensors located before the catalytic converter(s) that monitor how much residual oxygen is in the exhaust flow.
The only other way I know of is to somehow measure how much air is going into the engine, calculate its weight, and compare that with the weight of the fuel used in the same time period.
I guess the answer to your question is that the simple way is to rely on the engineers who build the fuel delivery system, and the caution light to advise you when things get out of whack.

Nov 30, 2016 | Cars & Trucks

Tip

### Calculating weighted averages in Excel

Excel does not have a built in function for calculating a weighted average. For a detailed example of how to do it, follow this link: http:\\www.meadinkent.co.uk\xlwtdavg.htm

Chris

on Sep 26, 2007 | Microsoft Office Standard for PC

### I had to install a hard start capacitor on the unit today. It's the first time running it this year and it never did start until I installed the extra boost.

I had a hard start on the compressor for more than 5 years and still running in hot Georgia when I sold the house. If you are thinking of improving efficiency with a new system/s I would be "calculating". Ours was an 18+yr old unit before the hard start was installed (Heat pump) so it ran longer and harder than most AC units. There won't be any warning signs until the breaker won't hold. Hope this helps.

Jun 07, 2015 | Heating & Cooling

### Which Casio calculators are capable of calculating the error function?

• The Casio FX991ESPLUS is Casio's most advanced scientific calculator with 417 mathematical functions
• Recommended for Advanced GCSE, A/AS level and Highers
• This ever popular model is now available with Random Integers and an improved equation mode

Oct 27, 2014 | Casio Office Equipment & Supplies

### E shows on left of screen with 0 on right hand side. I can't get it to respond to any prompt.

sounds as if your calculator has registered a number to large to display. this can be done in either the normal calculating mode, or in the memory calculating mode. i will help with both scenarios.

for normal calculating mode:
try pressing the CE button and holding for about a half a second. the E should disappear and calculating function should resume.
if that doesn't work, try disconnecting power supply for a few seconds, then reestablishing power and hit CE

for memory calculating mode(there will be a M on the screen as well if this is the problem)
press either the CE or MC/MCE button for a half second. this should return normal function.
if that doesn't work, try the power reset as described above.

Jan 15, 2014 | Canon MP18D II Basic Calculator

### My Coolpix s710 has suddenly developed an over exposure problem. Any suggestions?

Check your "exposure compensation" setting. It should be "0". If it is, you can experiment by setting it to a lower number and see if your pics improve.

Feb 28, 2011 | Nikon COOLPIX S710 Digital Camera

### Grainy pictures

If you are taking pictures in low-lighting conditions without flash, then the pictures will appear grainy. Set the ISO to a lower number (try ISO-100 to start with) and use the flash to compensate for low-light conditions.
This should improve the grainy appearance of your photos.

Dec 29, 2010 | Nikon D100 Digital Camera

### How often should I get a tune up?

as your engine is computer controlled, you should never need to "tune it"if you start to use more fuel than usual just changing the air filter can have a major effect,same as using high octane fuel....the computer will compensate for any loss/improvements,to give you the best mileage/performance.

Apr 26, 2010 | 2005 Chevrolet Impala

### Dark exposure

Check your ISO setting...should be between 100 to 400 for normal pictures.Did you change your exposure compensation setting to something other than "0"? Is the aperture ring on the lens set to the "A" position?

Feb 23, 2010 | Nikon D40x Digital Camera

### Is there a way to improve fueleconomy on 4.7 L 4X4 Durango's

swap in a tcm for 2002 to 2004 jeep grand cherokee with a 4.7 and 545rfe transmission. you have a 45 rfe transmission and it is identical on the inside to a 545rfe. type in 45rfe to 545 rfe conversion on google and follow the dodge threads that come up for more details.

Mar 07, 2009 | 2001 Dodge Durango

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