Need Help 2008 FZ6 Spraying Fuel out the Exhaust

[EJ_FZ6]

Good afternoon all,

I have been struggling trying to pinpoint the problem with my bike. I purchased a 2008 FZ6 from marketplace a few weeks ago and recently noticed it runs rich, due to the intense smell of gas coming from the bike when it is running. It also slightly hunts for RPM at idle. Very recently after installing new injectors I noticed unburnt gas leaking from the midpipe and the exhaust pipe clamp and running down the exhaust. It also sprays fuel from the exhaust when revved up. I performed a fuel pressure test and got 41 PSI on the gauge with the bike running, and noticed the manual recommends 36 PSI. I wasn't sure of the tolerance of the fuel pressure in between the fuel pump and the fuel rail so I ordered a fuel pressure regulator. I also have an replacement O2 sensor that I haven't installed yet. I want to fix the problem without continuously shot gunning parts and didn't know if there was a part on the bike that commonly fails resulting in excess fuel being sprayed out. The only thing I haven't ordered is ignition coils or a throttle body sync device, hopefully the new FPR and O2 can fix this, if not I will update this thread in search of more assistance. Any recommendations is greatly appreciated.

 

[Gary in NJ]

It sounds like you have an injector that is stuck open.

The 5psi difference in fuel pressure could be in the gauge itself.

 

[EJ_FZ6]

Here is an image from the throttle body, is it normal for liquid to be sitting in the cylinders? I tested the new fuel injectors with the diagnostic mode and felt each one click open and close. This may not be the best method to test. There is liquid in all cylinders could this be head gasket or still fuel related?

 

[EJ_FZ6]

Also starting it I can see each injector pulsing gas in every cylinder.

 

[Motogiro]

TPS? You can test it. Does the bike possibly have an after market fuel manager? Did someone wack the CO out of the ball park?

The other possibility could be, there are 2 separate fuel injector signals for all four injectors. If there were a crossed injector path within the ECU or a crossed pin leaving the ECU and /or a crossed fuel injector output you would be dumping extra fuel.

 

[TownsendsFJR1300]

How many cylinders and which ones are FLOODED (we got 3 pic's, all from one cylinder or 3 cylinders)?


Agreed with Gary, stuck injectors, or possibly leaking injector o-rings.

I suppose , and I'm just throwing it out, something electrical is turning on the injectors when
it shouldn't.

That's the only way to get fuel into the intake.

Are these OEM injectors or after market, were they replaced at some point?

If you turn the key on (no crank initially) while looking down into the valves, is fuel
making it's way into each intake? It should NOT at that specific time.

As a side note, I wouldn't be riding the bike till it's resolved. All that excess fuel is
diluting your oil and wiping down the pistons/cylinder of oil... Hydraulic lock is also possible.

*And as for is this a common issue, no... Fueling issues, running rich, lean, popping, etc are sometimes an issue
but NEVER to the extent of what your having...

Somethings to explore. getting injectors tested, get OEM parts and get those tested, inspect o-rings, etc.


.

 

[EJ_FZ6]

The pictures were of the cylinders with the intake valves open, not sure which numbers. After running it for a while it seems the flooding was occurring due to my error in starting the bike while cold multiple times and not allowing the fuel to be burned, unless it should never get that high in the cylinder I’m not very experienced.

The bike also showed a diagnostic code 46 “Power to the FI system is not normal”. I have a new lithium battery installed. The injectors are aftermarket and the same rich smell issue was happening with the OEM denso injectors. After running the bike normal the cylinders are dry and not flooded like those pictures, I made a mistake in troubleshooting.

 

[EJ_FZ6]

Also to add there is no more fuel coming from the exhaust, I think I flooded it when continuously restarting the bike

 

[EJ_FZ6]

How many cylinders and which ones are FLOODED (we got 3 pic's, all from one cylinder or 3 cylinders)?


Agreed with Gary, stuck injectors, or possibly leaking injector o-rings.

I suppose , and I'm just throwing it out, something electrical is turning on the injectors when
it shouldn't.

That's the only way to get fuel into the intake.

Are these OEM injectors or after market, were they replaced at some point?

If you turn the key on (no crank initially) while looking down into the valves, is fuel
making it's way into each intake? It should NOT at that specific time.

As a side note, I wouldn't be riding the bike till it's resolved. All that excess fuel is
diluting your oil and wiping down the pistons/cylinder of oil... Hydraulic lock is also possible.

*And as for is this a common issue, no... Fueling issues, running rich, lean, popping, etc are sometimes an issue
but NEVER to the extent of what your having...

Somethings to explore. getting injectors tested, get OEM parts and get those tested, inspect o-rings, etc.


.

The only time fuel is sprayed into the intake is when cranking. Without cranking no fuel is exiting the injectors.

 

[EJ_FZ6]

TPS? You can test it. Does the bike possibly have an after market fuel manager? Did someone wack the CO out of the ball park?

The other possibility could be, there are 2 separate fuel injector signals for all four injectors. If there were a crossed injector path within the ECU or a crossed pin leaving the ECU and /or a crossed fuel injector output you would be dumping extra fuel.

The TPS I tested in the diagnostic mode and it swept smoothly through all values with no variation.

 

[TownsendsFJR1300]

The amount of fuel shown is NOT NORMAL, even flooded.

A failed carberator leaking internally might, but not a fuel injected engine.


I would have your OEM Denso injectors serviced and re-install them to start with..


.

 

[Motogiro]

The TPS I tested in the diagnostic mode and it swept smoothly through all values with no variation.

Have you confirmed the bike has no fuel management like a power commander?

 

[EJ_FZ6]

There is no power commander installed in the bike. I recently had to replace the sprockets and chain and the bike wasn’t able to be ran. The flooding occurred because I was starting the bike without the ignition system plugged in to diagnose the fuel system. I didn’t understand what I was doing until learning more about this bike

I have been riding the past few days and the main issue is the bike has a real hard time starting without applying throttle and sometimes hunts for idle. I have yet to install the new O2 and I think I am going to get the DENSO injectors cleaned and reinstalled and look into valve adjustment.

 

[EJ_FZ6]

Also I have a friend that works on bikes and he mentioned that smell could just be the 93 gas smell, but I’m not sure

 

[Motogiro]

Also I have a friend that works on bikes and he mentioned that smell could just be the 93 gas smell, but I’m not sure

Long time ago when I was a kid, There were 2 old guys that owned the Texaco gas station just buy our town local bus stop. That's probably where I started my interest in cars and stuff that goes boom.
Old Joe had 50 gallon drums of recycled oil. Back in the day they did that. He would sometimes have us kids fill the glass bottles while he was alone at the pumps with customers.
One day I'm filling those glass bottles and he comes in from the pumps to get a bottle of oil. He looks at me and quickly dips his finger in the oil and then stuck his finger in his mouth and says, "Yup! That's 10w-40!" Then ran back out to the pump. Of course, he was switching fingers.
I think your friend is old Joe reincarnated.