Odd sputtering problem - Discuss Odd sputtering problem on CBRXX, the ultimate on-line community for Honda motorcyclists. Read it in Engine / Airbox / Exhaust / Fuel Delivery. (Discussion of Honda CBR 1100 XX Super Blackbird Engine Modifications, Airbox Modifications, Exhaust Systems, Power Commanders, and Carburetors.)

willi1962 · 03-04-2010, 5:01 PM

Sold my ST1100 and just purchased my bird. It's a 2001 that in spite of a 1/4 tank of old fuel, during test ride, ran as good as I expected. Brought home and rode 10-15 miles no problems. Stopped and filled with 91 OCT fuel, and within 10-15 miles started getting a noticable sputtering when the throttle was anywhere from 10-25%, doesn't seem to matter what rpm, as soon as the r's level out, it starts chugging and acting like it is misfiring or dropping a plug. Crack the throttle open and it rockets off again.
Did I inherit an electronics problem, or just a combo of bad fuel, something else? The FI light doesn't indicate a fault so not sure what else to look for. One additional item, smells very rich or like raw fuel being pushed out of the exhaust.
Please don't let this sour my first experience.

Nutter67 · 03-04-2010, 5:03 PM

Run a couple of tanks of SeaFoam through it, and see if the problem still exists. May have been some crap in the tank that was dislodges when you refilled (or crap fuel from the fill up).

shewie · 03-04-2010, 5:05 PM

You may have picked up some water at that fill up. Adding some methyl hydrate may help, but if it were me, I would just drain the tank and fill it with fuel from a different source.

Scrappy · 03-04-2010, 5:47 PM

Yep, fuel .... my BB only likes quality fuel ... If I put rubbish in from say supermarkets she hates me!

willi1962 · 03-04-2010, 5:50 PM

Ok, what is seafoam? Does it hurt to run injector cleaner through a tank? I definitely suspect the gas, but wanted ideas first.

shewie · 03-04-2010, 6:35 PM

Sea Foam is about the best stuff you'll ever put in your tank, aside from gasoline. Here: Sea Foam | Home

TWEET · 03-05-2010, 8:32 AM

check the fuel presseure reg.
Easiest way is lift tank, remove airbox lid and then turn key on and while looking down the intake tubes, cycle the run/stop button from off to on and see if any of the injectors are dribbling when you hear the pump prime the line. If 2+3 (2 middle ones) dribble when the pump pressurises the line, it's time for a new regulator.

99BLACKBIRD · 03-05-2010, 9:53 AM

Amazon is selling a case of 10 for $39.00. I think that is a good deal.

willi1962 · 03-07-2010, 7:50 PM

Ok, now the problem has gotten worse. Seemed to improve for a day or two and then definitely started missing worse. Now seems like I may have fouled a plug and running horrid. Guess it time for a prffessional.

shewie · 03-07-2010, 8:00 PM

Did you drain the fuel and refill with fresh stuff from a know good source?

Poundstretcher · 03-08-2010, 12:22 AM

Sounds like a fouled plug or dodgy ht lead. Run the Bird on premium fuel and she will reward you for it. Although this wont cure a fouled plug or dodgy lead problem.

dracki · 03-08-2010, 3:28 AM

does it have a power comander,check behind the seat

Scrappy · 03-08-2010, 2:37 PM

As well as the plugs, check the fuel lines and vacuum hoses for leaks etc

willi1962 · 03-08-2010, 3:22 PM

Ran a can of the seafoam in it, seemed better then started progressively getting worse on the next tank (with additional seafoam). left to right, I lost the third cylinder, pipe is cold (tried the other three hot ones first though). It did have a TFI Techlusions box under the seat, not connected. The box looks to be statndard honda hardware. I will pull the cowls tonight and see if the plug is fouled or what is happening. Since I brought it home, it has only had 91 octane fuel.

dracki · 03-09-2010, 12:51 AM

before you start it next,make sure your connected with only the ECU to all electrics it controls,under the tank at your left knee is a multi pin plug,check it & if a power comander or anything else is in series with it,disconnect it,start it by its own ECU/ECM

ironmike · 03-10-2010, 7:49 PM

Tweet likely nailed it - the diaphragm in the fuel pressure regulator has been compromised. Bad gas and too much ethanol can do it. Lift the tank and check (pull) the vent hoses going to the throttle bodies; if raw fuel runs out (the inner two cylinders are the usual suspects) your FPR (right side, end of the fuel rail) is toast. The good news is that it's easy to replace.

willi1962 · 03-18-2010, 4:54 PM

Ok Tweet and IronMike are the winners. Pulled the vaccuum line while running and fuel was pumping faster there than going in to the injectors. Third cylinder was always the first to go. $60 later and I will be back on the road by Tuesday. Thanks again everyone for the help.

Quote:

Originally Posted by TWEET

check the fuel presseure reg.
Easiest way is lift tank, remove airbox lid and then turn key on and while looking down the intake tubes, cycle the run/stop button from off to on and see if any of the injectors are dribbling when you hear the pump prime the line. If 2+3 (2 middle ones) dribble when the pump pressurises the line, it's time for a new regulator.

03-04-2010, 5:03 PM	#2
Nutter67 Administrator Join Date: Aug 31 2007 Location: Cranbourne, Victoria, Australia Age: 43 Posts: 5,955	Re: Odd sputtering problem Run a couple of tanks of SeaFoam through it, and see if the problem still exists. May have been some crap in the tank that was dislodges when you refilled (or crap fuel from the fill up). __________________ *Paul* *Never let a motorcycle take you somewhere your brain didn't get to three seconds earlier*

03-04-2010, 5:05 PM	#3
shewie Resident Eh?hole. Join Date: Oct 26 2008 Location: Ontario, Canada Age: 43 Posts: 7,140	Re: Odd sputtering problem You may have picked up some water at that fill up. Adding some methyl hydrate may help, but if it were me, I would just drain the tank and fill it with fuel from a different source. __________________ If you don't like the way I ride then stay off the sidewalk.

03-04-2010, 5:47 PM	#4
Scrappy Dog With Atittude .. Woof! Join Date: May 31 2009 Location: Mansfield UK Age: 45 Posts: 890	Re: Odd sputtering problem Yep, fuel .... my BB only likes quality fuel ... If I put rubbish in from say supermarkets she hates me! __________________ If in doubt .. don't do it!

03-04-2010, 5:50 PM	#5
willi1962 Join Date: Mar 04 2010 Location: Littleton, CO Posts: 14	Re: Odd sputtering problem Ok, what is seafoam? Does it hurt to run injector cleaner through a tank? I definitely suspect the gas, but wanted ideas first.

03-04-2010, 6:35 PM	#6
shewie Resident Eh?hole. Join Date: Oct 26 2008 Location: Ontario, Canada Age: 43 Posts: 7,140	Re: Odd sputtering problem Sea Foam is about the best stuff you'll ever put in your tank, aside from gasoline. Here: Sea Foam \| Home __________________ If you don't like the way I ride then stay off the sidewalk.

03-05-2010, 8:32 AM	#7
TWEET Moderator Join Date: Oct 31 2006 Location: Sydney, Australia Posts: 384	Re: Odd sputtering problem check the fuel presseure reg. Easiest way is lift tank, remove airbox lid and then turn key on and while looking down the intake tubes, cycle the run/stop button from off to on and see if any of the injectors are dribbling when you hear the pump prime the line. If 2+3 (2 middle ones) dribble when the pump pressurises the line, it's time for a new regulator. __________________ "Clear For Takeoff"

03-05-2010, 9:53 AM	#8
99BLACKBIRD Join Date: Apr 14 2009 Location: SAN ANGELO, TX Posts: 148	Re: Odd sputtering problem Amazon is selling a case of 10 for $39.00. I think that is a good deal.

03-07-2010, 7:50 PM	#9
willi1962 Join Date: Mar 04 2010 Location: Littleton, CO Posts: 14	Re: Odd sputtering problem Ok, now the problem has gotten worse. Seemed to improve for a day or two and then definitely started missing worse. Now seems like I may have fouled a plug and running horrid. Guess it time for a prffessional.

03-07-2010, 8:00 PM	#10
shewie Resident Eh?hole. Join Date: Oct 26 2008 Location: Ontario, Canada Age: 43 Posts: 7,140	Re: Odd sputtering problem Did you drain the fuel and refill with fresh stuff from a know good source? __________________ If you don't like the way I ride then stay off the sidewalk.

03-08-2010, 12:22 AM	#11
Poundstretcher A Rainbird Warrior Join Date: Oct 15 2008 Location: Tasmania Posts: 4,584	Re: Odd sputtering problem Sounds like a fouled plug or dodgy ht lead. Run the Bird on premium fuel and she will reward you for it. Although this wont cure a fouled plug or dodgy lead problem.

03-08-2010, 3:28 AM	#12
dracki Back in Black,AC/DC Join Date: Mar 03 2008 Location: Brisbane,Queensland,Australia Posts: 1,946	Re: Odd sputtering problem does it have a power comander,check behind the seat __________________ Attitude,Charisma,Mojo & Spunk. Thats what you have on a BLACK Blackbird & there the fastest.the rest of you just dream about that annoying Shewie,Lois & Poundstrecher one post at a time

03-08-2010, 2:37 PM	#13
Scrappy Dog With Atittude .. Woof! Join Date: May 31 2009 Location: Mansfield UK Age: 45 Posts: 890	Re: Odd sputtering problem As well as the plugs, check the fuel lines and vacuum hoses for leaks etc __________________ If in doubt .. don't do it!

03-08-2010, 3:22 PM	#14
willi1962 Join Date: Mar 04 2010 Location: Littleton, CO Posts: 14	Re: Odd sputtering problem Ran a can of the seafoam in it, seemed better then started progressively getting worse on the next tank (with additional seafoam). left to right, I lost the third cylinder, pipe is cold (tried the other three hot ones first though). It did have a TFI Techlusions box under the seat, not connected. The box looks to be statndard honda hardware. I will pull the cowls tonight and see if the plug is fouled or what is happening. Since I brought it home, it has only had 91 octane fuel.

03-09-2010, 12:51 AM	#15
dracki Back in Black,AC/DC Join Date: Mar 03 2008 Location: Brisbane,Queensland,Australia Posts: 1,946	Re: Odd sputtering problem before you start it next,make sure your connected with only the ECU to all electrics it controls,under the tank at your left knee is a multi pin plug,check it & if a power comander or anything else is in series with it,disconnect it,start it by its own ECU/ECM __________________ Attitude,Charisma,Mojo & Spunk. Thats what you have on a BLACK Blackbird & there the fastest.the rest of you just dream about that annoying Shewie,Lois & Poundstrecher one post at a time

03-10-2010, 7:49 PM	#16
ironmike Join Date: Nov 04 2006 Location: Shreveport, LA Posts: 274	Re: Odd sputtering problem Tweet likely nailed it - the diaphragm in the fuel pressure regulator has been compromised. Bad gas and too much ethanol can do it. Lift the tank and check (pull) the vent hoses going to the throttle bodies; if raw fuel runs out (the inner two cylinders are the usual suspects) your FPR (right side, end of the fuel rail) is toast. The good news is that it's easy to replace.

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