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Re:Fuel Injection Facts and Tips
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TOPIC: Re:Fuel Injection Facts and Tips
#851481
Doc_V (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Can't speak specifically for the Roadstar, [mine is carbed] but I've dealt with plenty of fuel injected motors over the years and there a few common issues that can cause performance problems, especially rough idle. Even if you think your bike is running well, you should do the first two of these at least twice a year, as preventative maintenance. More often if you ride more than 12k miles a year.

Frist is the Air Mass Sensor, also referred to as the Mass Air Sensor or Mass Air Flow meter [MAF]. The sensor gets dirty after a while, *especially* if you're using a K&N filter. The red oil you spray on the K&N filter, after cleaning, can foul the sensor if you use too much. Also, if you run an aftermarket air filter housing, you don't want to vent the crankcase to the filter housing for the same reason, unless it's *after* the MAF. Pick up a can CRC MAF Cleaner. DO NOT USE CARB CLEANER!! Carb cleaner will leave a film on the sensor and make it worse. The MAF Cleaner works great and can make quite a difference.



Next are the injectors; the nozzles can get clogged over time. Pick up a can of Techron and run it through a few tanks.

The other is the oxygen or O2 sensor, [sometimes referred to as the Lambda Probe] they do go bad after a while and will cause problems with the fuel mixture. They need to be tested with a multimeter to determine if they've gone bad.

Here's a video demonstrating the test procedure for the single and triple wire probes to give you an idea.



Beyond that, if none of those work, check your fuel pressure regulator, fuel filter and pump. Also, don't' forget the obvious stuff like clean air filter and fresh plugs.
 
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Last Edit: 2015/01/21 03:13 By Doc_V.
 


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#851484
ABLE (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Thanks for starting this. I too wonder about my F.I. bike and the stock fuel map. I want to add a BAK or other intake, less for performance and more for looks and ergonomics, but wonder if I'll need a Power Commander/Programmer given that I already have Cobra Speedster Longs, although they're using the stock 02 sensors (installed by P.O.). I've read conflicting opinions on this and even the dealer is wishy washy on the topic.
 
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#851489
BikerRon (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
ABLE wrote:
Thanks for starting this. I too wonder about my F.I. bike and the stock fuel map. I want to add a BAK or other intake, less for performance and more for looks and ergonomics, but wonder if I'll need a Power Commander/Programmer given that I already have Cobra Speedster Longs, although they're using the stock 02 sensors (installed by P.O.). I've read conflicting opinions on this and even the dealer is wishy washy on the topic.

http://roadstarclinic.com/component/option,com_fireboard/Itemid,187/func,view/id,851428/catid,13/limit,10/limitstart,0/
 
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#851495
Deerkiller (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Doc_V wrote:
Can't speak specifically for the Roadstar, [mine is carbed] but I've dealt with plenty of fuel injected motors over the years and there a few common issues that can cause performance problems, especially rough idle. Even if you think your bike is running well, you should do the first two of these at least twice a year, as preventative maintenance. More often if you ride more than 12k miles a year.

Frist is the Air Mass Sensor, also referred to as the Mass Air Sensor or Mass Air Flow meter [MAF]. The sensor gets dirty after a while, *especially* if you're using a K&N filter. The red oil you spray on the K&N filter, after cleaning, can foul the sensor if you use too much. Also, if you run an aftermarket air filter housing, you don't want to vent the crankcase to the filter housing for the same reason, unless it's *after* the MAF. Pick up a can CRC MAF Cleaner. DO NOT USE CARB CLEANER!! Carb cleaner will leave a film on the sensor and make it worse. The MAF Cleaner works great and can make quite a difference.



Next are the injectors; the nozzles can get clogged over time. Pick up a can of Techron and run it through a few tanks.

The other is the oxygen or O2 sensor, [sometimes referred to as the Lambda Probe] they do go bad after a while and will cause problems with the fuel mixture. They need to be tested with a multimeter to determine if they've gone bad.

Here's a video demonstrating the test procedure for the single and triple wire probes to give you an idea.



Beyond that, if none of those work, check your fuel pressure regulator, fuel filter and pump. Also, don't' forget the obvious stuff like clean air filter and fresh plugs.


Doc, the FI Roadie works like a speed density system. It does not have a mass airflow sensor. It's a more primitive system, like some of the early cars with FI. Wish it was a MAF system, as tuning would probably be easier and a MAF system is less complicated, IMO.
 
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#851656
fpontarolo (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
My 2008 has the stock controller. I have HK sideburner 2 into 1 pipes and KN filter. When I bought it 2 years ago with 6000 mi on it, it didn't have any O2 sensors and a Cobra FI2000 on it. I had already been reading on the forum and didn't even turn it over until I had things back to stock.

Go Seahawks
 
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#851710
Shores (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Doc_V wrote:


Here's a video demonstrating the test procedure for the single and triple wire probes to give you an idea.





Excuse my ignorance, but how does the O2 sensor generate voltage? From heat or gas mixture?
 
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Last Edit: 2015/01/21 22:24 By Shores.
 

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#851723
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
It generates voltage by the amount of oxygen moving through the sensor. Here's a good explanation from NGK: http://www.ngk.com.au/oxygen-sensors/technical-information/how-does-the-oxygen-sensor-work
 
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#851725
Shores (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
texasscott1 wrote:
It generates voltage by the amount of oxygen moving through the sensor. Here's a good explanation from NGK: http://www.ngk.com.au/oxygen-sensors/technical-information/how-does-the-oxygen-sensor-work

So do ours generate their own voltage or is a voltage supplied to them and they alter the resistance?
 
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#851729
texasscott1 (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Ours generate their own voltage. The heater gets the sensor up to operating temperature faster.
 
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#852113
Shores (User)
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Re:Fuel Injection Facts and Tips 3 Years, 1 Month ago  
Bump!
 
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