Injector Timing VS RPM VS 02 sensors...

[Infinitiguy19]

I was going over my ECUtalk logs and I see that the Injector times are off a tiny bit from each other. Meaning that they are not extremly close together on a graph and you can see that one bank is a little slower than the other.

Do the O2 sensors that may need replacing have anything to do with this?

Would any injector cleaners be able to fix this, In other words would this be because they are clogged?

Is this an electrical issue?

And I know that not every bank and possibly cylinder gets an equal amount of air, Could this be attributed to that?

[Q45tech]

Generally the injector open times should be within 0.2 milliseconds bank to bank. Obviously there may be a lag of a few revolutions. Thats's the MPG rub how fast do the O2 switch [cross the 0.45 volt center].

When I replace one rail [4 used injectors] the readings sudden diverged by 0.3 ms until the system stablized [adaptive learn- fuel trims]

A brand new O2 can do 5-10 crossings per second but the ecu and injectors cannot keep up with such rapid oscillations.

How often is a change necessary to zero in on 14.7 [14.23 with E10]?

If the injector reads 3.0 ms you must deduct the time from voltage application until the pinitle is fully open and the frictional delay of the fuel stopping and starting. Say 1.0 ms so 2.0 ms is real flow time so 0.1 ms is 5%.

5% of 23 mpg is 1.15 mpg. That's roughly the difference between BRAND NEW O2 and old O2...................1-1.5-2.0 MPG.

WHEN the ECU sees the O2 is sluggish it often reverts to the preprogrammed values for injectors, timing, etc especially around 55-65 MPH. This may be good or bad depending on the flow rate of injectors.

If you drive lots of miles, mostly at a steady speed [55>80 MPH] O2 can significantly change MPG.

Cost vs savings depends on annual fuel purchases. Currently it saves about $125 per year to always have good fast switching O2 if you drive at least 10,000 miles per year on interstates with a steady speed.

Just using E10 has dropped MPG by at leat 3.3% probably more like 5-7% when all things are considered since the ecu was designed to maintain 14.7 not the richer 14.2 that the E10 requires thanks to 3.3% more OXYGEN in the fuel.

Hope I'm being clear that the O2 change with gasoline as their sole purpose is the read the EXCESS OXYGEN in the exhaust, The only way the ecu can bring things back to preprogrammed normal is to add MORE fuel since it cannot change AIR oxygen levels unlike newer drive by wire or EGR systems which can to a minor degree.

[Infinitiguy19]

So the 02 sensors can add and subtract fuel, Right?

Would they cause the car not to redline where it should?

I unplugged them according to Matt1979 and I noticed no difference without a laptop Consult plugged in.

And I got 18 MPG driving like a granny around town. I haven't recorded the Highway MPG because I have a hard time keeping my foot off the throttle.

At idle The Q uses 10 MPG and at WOT* the Q uses 8-9 MPG.

*Wide Open Throttle
Modified by Paul Wall at 1:11 AM 9/26/2009

[Q45tech]

The O2 tells the ecu. Feedback concerning lean rich lean.

O2 are ignored during acceleration. Because acceleration richness is preprogrammed via chip vs MAF vs RPM vs TPS [load factor].

Idle MPG is ZERO. It is however about 1.0 gallon per HOUR of idling depemding on rpm and load [lights, ac, rear defroster,etc].Why exact idle rpm is important, 10% higher than spec consumes 10% more fuel