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Discussion Starter · #1 ·
Hello,

I have a problem with my bikes throttle response.

Bike is 27k km, 2007 with O2 sensor
Idle is not very good, I had to up it to 1300 rpm to be acceptable.
Throttle response is not good, bike is acting like is not getting enough fuel up to about 4000 rpm, then is good.
I have this problem since i got the bike, at 9k km, almost brand new.
What I tested until now:
no error codes
replaced the spark plugs and tested the coils, all good
new air filter k&n
cleaned the fuel filter
cleaned the all the contacts, stator/rectifier/ battery is all good.
fpr is not leaking
no leaks in the exhaust
removed the pair system
throttle cable, butterflies are all good, nice and clean.
synchronized the fi
added fuel injectors cleaner

My other honda, a carburated vfr 750 is nice and smooth on acceleration, same with the other bikes I had, or my friends bikes, so I know how it should run.

If i use a O2 sensor eliminator, the throttle response is better but not great, the fuel starvation sensation is no longer there, but idle is still fluctating about 80-90 rpm, engine is running rough still.

My question:
Is this normal? Did honda added the O2 sensor and crap fuel map for emission purposes? and it is supposed to run like this?
I even added a Power Commander III which helped but not cured the problems, most likely hiding the problem.
Your O2 equipped bikes runs the same?

What else should I test?

Thank you.
 

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Discussion Starter · #3 ·
about normal, around 7l/100 km i have seen bette and worst :)
exhaust is a little dark if u ask me.
 

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Hello,

I have a problem with my bikes throttle response.

Bike is 27k km, 2007 with O2 sensor
Idle is not very good, I had to up it to 1300 rpm to be acceptable.
Throttle response is not good, bike is acting like is not getting enough fuel up to about 4000 rpm, then is good.
I have this problem since i got the bike, at 9k km, almost brand new.
What I tested until now:
no error codes
replaced the spark plugs and tested the coils, all good
new air filter k&n
cleaned the fuel filter
cleaned the all the contacts, stator/rectifier/ battery is all good.
fpr is not leaking
no leaks in the exhaust
removed the pair system
throttle cable, butterflies are all good, nice and clean.
synchronized the fi
added fuel injectors cleaner

My other honda, a carburated vfr 750 is nice and smooth on acceleration, same with the other bikes I had, or my friends bikes, so I know how it should run.

If i use a O2 sensor eliminator, the throttle response is better but not great, the fuel starvation sensation is no longer there, but idle is still fluctating about 80-90 rpm, engine is running rough still.

My question:
Is this normal? Did honda added the O2 sensor and crap fuel map for emission purposes? and it is supposed to run like this?
I even added a Power Commander III which helped but not cured the problems, most likely hiding the problem.
Your O2 equipped bikes runs the same?

What else should I test?

Thank you.
possible could need injectors cleaned tested if they are causing trouble doubt if injector cleaners goin to fix the problem if thats the issue
 

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I had to google it, this is 40mpg UK. Normal. Exhaust a little dark, yes they all are. These machines tend to run a little rich.

As above, double check injectors.

Possible defective FPR, that is not maintaining pressure, even though its not leaking?
 

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Discussion Starter · #6 ·
possible could need injectors cleaned tested if they are causing trouble doubt if injector cleaners goin to fix the problem if thats the issue
yes, I added this to my check list.
bike is running good after 4000 rpm + I dont feel the hesitation anymore, does this make sens in case of a faulty injector?
 

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Discussion Starter · #7 ·
I had to google it, this is 40mpg UK. Normal. Exhaust a little dark, yes they all are. These machines tend to run a little rich.

As above, double check injectors.

Possible defective FPR, that is not maintaining pressure, even though its not leaking?
FPR would make sense, only test I did was for leaking.
I will have to do a pressure test.

Bike is running good after 4k rpm.

O2 delete is helping, PCIII also helps, It must be something on fueling system.
 

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When you say you cleaned the throttle bodies. Did you leave the black moly coat in the bores and on the blades? If not then you may have ruined them.
Second thought check TPS voltage. It should be smooth.
 

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Discussion Starter · #9 ·
black moly coat is there, I did not touch that. Also tps voltage is good, climbing nice when I open the throttle.
 

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You say the battery is good. How old is it. I've seen this issue before put in a new battery and problem went away. Another path would be to have the AFR checked.
 

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Discussion Starter · #11 · (Edited)
Disconnected the TPS and there is no surging anymore, I will take if for a ride tomorrow without the sensor connected. I think bike runs on some sort of base map without tps on?

I need to take it down and inspect it, however there is no access to the sensor, and i dont want to take down the whole FI unit.

Battery is 4 years old, I will test with another one.
 

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Battery is 4yo :unsure:........ my 20c is that is the problem...... AGM batteries don't usually last that long, and even if charged every night, they may be depleted and can be damaging the R/R with continued use.

Try a load test, but make sure you leave the battery for 12hrs off charger (but in the bike) before measuring the 1st start voltage. While cranking the engine a good battery should record above 9.5v, then when the engine fires, and with the BB's cold idle keeping the revs up, 14v. A bad battery will record <9.5 and should be replaced as it is no longer accepting a full charge regardless of overnight or constant charging. I found my AGM batteries only lasted 2-3 yrs depending on usage and I have never replaced a R/R...... I just buy a new battery when the load test voltage tells me.

Best to test this asap before getting too deep into the electronics. My stock 05BB c/w O2 sensor (but with K&N airfilter) runs like an electric motor with power everywhere....... so your 07 should run smooth as silk too.

How did you do the throttle body synchro? Did you use a fluid manometer to read the differences in vacuum between the cylinders? It always sounds simple but there is a knack to getting them even and as always, time spent making sure there are no vacuum leaks makes for a good outcome and a happy smooth running BB ;).

Have a look at the workshop manual (for the 99-02 - should be good for the 07 anyway) - it's in the resources section and can be downloaded.

(y) PS I recently replaced my FPR and fuel filter as a precaution (after 16yrs and 130k kms) and tested the fuel pump flow rate as per the workshop manual flow test (cc's pumped out in 10secs test) - I didn't do the pressure test as it made sense to put a new FPR on instead of try to buy a fuel pressure gauge, and then put a new FPR on anyway......... ;).
 

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Hello,

I have a problem with my bikes throttle response.

Bike is 27k km, 2007 with O2 sensor
Idle is not very good, I had to up it to 1300 rpm to be acceptable.
Throttle response is not good, bike is acting like is not getting enough fuel up to about 4000 rpm, then is good.
I have this problem since i got the bike, at 9k km, almost brand new.
What I tested until now:
no error codes
replaced the spark plugs and tested the coils, all good
new air filter k&n
cleaned the fuel filter
cleaned the all the contacts, stator/rectifier/ battery is all good.
fpr is not leaking
no leaks in the exhaust
removed the pair system
throttle cable, butterflies are all good, nice and clean.
synchronized the fi
added fuel injectors cleaner

My other honda, a carburated vfr 750 is nice and smooth on acceleration, same with the other bikes I had, or my friends bikes, so I know how it should run.

If i use a O2 sensor eliminator, the throttle response is better but not great, the fuel starvation sensation is no longer there, but idle is still fluctating about 80-90 rpm, engine is running rough still.

My question:
Is this normal? Did honda added the O2 sensor and crap fuel map for emission purposes? and it is supposed to run like this?
I even added a Power Commander III which helped but not cured the problems, most likely hiding the problem.
Your O2 equipped bikes runs the same?

What else should I test?

Thank you.
I'm pretty sure you have to use a O2 sensor eliminator when you run a Power Commander. Otherwise the two are clashing with one another trying to get optimum idling and power. maybe look into this a bit more!!
 

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Hello,

I have a problem with my bikes throttle response.

Bike is 27k km, 2007 with O2 sensor
Idle is not very good, I had to up it to 1300 rpm to be acceptable.
Throttle response is not good, bike is acting like is not getting enough fuel up to about 4000 rpm, then is good.
I have this problem since i got the bike, at 9k km, almost brand new.
What I tested until now:
no error codes
replaced the spark plugs and tested the coils, all good
new air filter k&n
cleaned the fuel filter
cleaned the all the contacts, stator/rectifier/ battery is all good.
fpr is not leaking
no leaks in the exhaust
removed the pair system
throttle cable, butterflies are all good, nice and clean.
synchronized the fi
added fuel injectors cleaner

My other honda, a carburated vfr 750 is nice and smooth on acceleration, same with the other bikes I had, or my friends bikes, so I know how it should run.

If i use a O2 sensor eliminator, the throttle response is better but not great, the fuel starvation sensation is no longer there, but idle is still fluctating about 80-90 rpm, engine is running rough still.

My question:
Is this normal? Did honda added the O2 sensor and crap fuel map for emission purposes? and it is supposed to run like this?
I even added a Power Commander III which helped but not cured the problems, most likely hiding the problem.
Your O2 equipped bikes runs the same?

What else should I test?

Thank you.
Swap out the FPR, dip your oil for the presence of petrol, you'll be able to smell it on the stick.
 

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Discussion Starter · #15 ·
Update:

no smell of fuel in oil, tested the fpr for leaks, there are none. I might replace the fpr anyway. are there upgraded fpr around? not sure if oem is best way to go.

Battery will be replaced today.

About the TPS, took it off and clean it, measured for resistance, first part of the rotation was crap: 0.35-0.32-0.37-0.35, after 0.40 was nice and smooth.
I calibrated the TPS on bike, engine running, close throttle is 0.80, max open is 5.5
Do you believe that 0.80 is a bit high? thing is bike loved it, engine is running a lot better.
 

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Discussion Starter · #16 ·
Update 2:

-replaced the battery just for testing, no difference.
-O2 delete kit added, muuuch better but not 100% ok, I believe my O2 sensor is busted.
-added the PC3 and a good map that I like.
-cleaned and calibrated the TPS for a higher initial voltage, 0.80, bike is running almost perfect at this point.
-recalibrated the throttle position using the power commander software.

As far as I can tell, the bike is running good, but more testing must be done.
I will try a leaner map for smoother operating, as I believe the actual AFR is not good.
 

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Update 2:

-replaced the battery just for testing, no difference.
-O2 delete kit added, muuuch better but not 100% ok, I believe my O2 sensor is busted.
-added the PC3 and a good map that I like.
-cleaned and calibrated the TPS for a higher initial voltage, 0.80, bike is running almost perfect at this point.
-recalibrated the throttle position using the power commander software.

As far as I can tell, the bike is running good, but more testing must be done.
I will try a leaner map for smoother operating, as I believe the actual AFR is not good.
Hey Marco, how's the bike running? mine seems to be doing exactly as yours was
 
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