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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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View Poll Results: What grade gasoline do you use?
Premium Gas 91+ octane 3,764 82.00%
Mid-Grade Gas 89-90 octane 313 6.82%
Regular 87 octane 391 8.52%
I mix it up, don't care, etc. 103 2.24%
Change based on the weather 19 0.41%
Voters: 4590. You may not vote on this poll

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  #1861  
Old 29th June 2021
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by Nitsu View Post
Can anyone provide an example of what “pinging” sounds like?
Take an empty 12 oz beverage can. Drop in half a dozen 1/4" nuts. Shake the can. That's pretty much what pinging/detonation sounds like.
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  #1862  
Old 29th June 2021
84rzv500r 84rzv500r is offline
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Quote:
Originally Posted by Tomcatt View Post
Take an empty 12 oz beverage can. Drop in half a dozen 1/4" nuts. Shake the can. That's pretty much what pinging/detonation sounds like.
yep that's exactly it
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  #1863  
Old 4th May 2022
Kzac Kzac is offline
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I shifted away from premium with Ethanol (about all that's available) to 90 oct without Ethanol (Sonoco), My EFi 1200 seems to run much better without Ethanol based fuel.
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  #1864  
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Originally Posted by Kzac View Post
I shifted away from premium with Ethanol (about all that's available) to 90 oct without Ethanol (Sonoco), My EFi 1200 seems to run much better without Ethanol based fuel.
I expect it would initially but when the ECU re-establishes trims the only difference should be better gas mileage with no ethanol fuel.
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  #1865  
Old 6th May 2022
Kzac Kzac is offline
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By Run better without Ethanol based fuel, I realize that is a completely subjective comment.
I have not performed any validation testing which would clearly indicate the difference between using pump premium and non ethanol fuel.
......
I do know that what is normally called premium is actually a mix and usually not 93 octane, as most manufactures place lower octane fuel behind higher octane fuels as a method of delivery, therefore, the result is always a mix. Few run a ball in the delivery pipe between high and low octane grades.
.......
Ethanol mix is what was used in fuel dragsters, especially high compression engines, when I was younger. We used Aviation 103 octane for race cars. which we would get from the local small airport, or sometimes from Sonoco stations as Sonoco 260 if they had it... In our little town there was one Sonoco dealer who sold 260 to the local hot rod guys.. I think now you have to order it in 5 gallon pales...

You are correct, the EFi system will (within its engineered map) adjust spark advance, as well as spark and injection dwell (time of the event) relative to the input provided by various sensors. My machine is completely stock (now), however there is a noticeable difference in the smoothness of the idle and engine performance during operation, when compared to the previous fuel I was using (BP premium).

When I acquired my XL1200.. I noticed off idle throttle up and slow maneuver performance issues (stumbling, hunting), I have been going through methodical changes to get the bike to run as is should.
Changing the fuel was one of those methodical changes which provided improvement.
The others were changing back to stock pipes and filters (vast improvement) as well as removing, cleaning and re-gasketing the intake.
.......
Now that last little bit seems to be entirely O2 related. When the previous owner changed the intake filter and pipes, they didn't change the ECU map, and the stock map ran the injectors rich to the point the O2 sensors are coated and need to be changed.
......
As engineers, we used to see this quite a bit in fuel injected vehicles, when they were modified without any programming (map) revisions. Basically the system compensates for the modification(s) with a full rich mixture (as rich as it is able to provide), until it coats the O2 sensors, causing them to read continually rich, this results in the ECU program, leaning out the mixture, because it assumes the O2 reading to be accurate. Without correction the eventual result is burned valves/seats or worse burned piston crowns, due to lean operation high temps...
....
Measuring my cylinder temps (and the inherent exhaust smell) confirmed what I had assumed... my engine was running very lean.... Improvements helped but getting the fuel management system sorted out will bring everything back in line. Going through the voltage verification this weekend for the O2 sensors of both cylinders... Expect to observe high voltage at idle to low speed, but not as high as 5v because I have not set any codes as of yet ... Assuming I will see 2 to 3 volts at idle Opp/temp, when it should be seeing a range of 0.2v to < 1v.
I will also verify the ITC/MAP output, a strange little creature.
.....
The earlier EFi systems on the Sportsters are a little odd because HD didn't install an AFM/IAT (probably related to available area/location and cost) , relying instead upon a contrivance which consolidates IAT&MAP sensors to articulate airflow to the ECM... a Bosh made little jewel...(my former employer).. I get how it works and slightly remember some discussion about a similar setup on cars some years back, but don't remember the end result. I assume they can get away with it because motorcycles of that period don't have a Cat.

Anyhow .... enough meandering about... Ya'll have a great day... Go ride...
....

Last edited by Kzac; 6th May 2022 at 16:50..
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