2001 F4i fuel/electric issue. - Honda Motorcycles - FireBlades.org
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post #1 of 21 Old 10-31-2016, 1:20 PM Thread Starter
 
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2001 F4i fuel/electric issue.

Ive done some searching on forums with many mixed cures but nothing thats definete. My first post here. Over the past 2 weeks my f4i with 29,500 miles has been having problems. Bike mods: micron exhaust chopped to roughly 4". No tune, dont believe valves have been done. Here are the symptoms.

All this happens above 165į+ on the cluster temp, the hotter it is worse the bike runs most of the time.
FI light comes on at random times, usually at engine brakeing or steady pace riding.

Stalling, unable to start again unless maybe bump start or turning it on and off a couple times. If im at speed when it stalls i can sometimes bump it on and keep going.

Backfiring

Rich exhaust smell

Unusual gas efficiency

Unsteady engine speeds when steady (if im steady at 5k for example, rpm stutters between 4800-5200 roughly without changing throttle positioning

A week ago i replaced the fuel pressure regulator, didnt fix the issue.
I have come to believe that it could be r/r, stator, fuel pump, battery, ground issue, could be anything. I dont have disposable funds to just fix everything on it so i am looking for help to narrow down possible issues, any questions or more details i need to provide dont hesitate to ask
Thanks.
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post #2 of 21 Old 10-31-2016, 1:44 PM
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Re: 2001 F4i fuel/electric issue.

Well the good news is, you can test the stator and R/R with a multimeter That doesn't take much time at all, and is free (with borrowed multimeter).

Has this problem been confined to a single tank of fuel...? or maybe to the same fuel from gas station? Have you pulled the plugs? Have you checked the fuses for corrosion? What is the age of the battery? Have you checked the battery connections? Do you park/store the bike outside? Do you ride in the rain much? I'd pull apart, clean, lubricate, and reassemble the bar-mounted EMERGENCY kill switch, and never use it again.

There are some (common) trouble areas that often require attention on bikes of this age, that are FREE to troubleshoot
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post #3 of 21 Old 10-31-2016, 3:53 PM Thread Starter
 
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Re: 2001 F4i fuel/electric issue.

fuel taken from same gas station never gave me problems. fuses have no corrosion. battery is unknown age, previous owner had the bike outside for a period of time. battery reads at 12.73, +/- connections are fine. never had the bikes battery die. have not checked the plugs, will do that and r/r when i get home. how do i use the multimeter on my r/r to check it? i dont ride in the rain too much. i will update when i get home and tear it apart.
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post #4 of 21 Old 10-31-2016, 4:00 PM
 
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Re: 2001 F4i fuel/electric issue.

What octane fuel are you putting in the bike? The manual states 87 Octane FWIW. I recommend that you put a stock pipe back on the bike and check the valve clearances.

Any "nused" acquisition is going to have some teething issues. Basic maintenance should be part of your purchase budget considerations.

I don't think this is electrical in origin.

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post #5 of 21 Old 10-31-2016, 4:26 PM Thread Starter
 
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Re: 2001 F4i fuel/electric issue.

93 octane. what do you mean by "nused" acquisiton?
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post #6 of 21 Old 10-31-2016, 4:27 PM
 
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Re: 2001 F4i fuel/electric issue.

new-used.
The bike is tuned for 87 from the factory.

-My 06 Fireblade Build Thread
-Her 02 CBR600F4i Custom Suspension
-My 07 CRF230F sold
-My 97 XR100
-07 CRF50F son's
-92 CB750 She lets me ride it, Jetted
-13 CRF110F, 01XR50 Daughter's

Because 12,000 RPM makes me feel better
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post #7 of 21 Old 10-31-2016, 6:57 PM
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Re: 2001 F4i fuel/electric issue.

Quote:
Originally Posted by Cmats_ View Post
fuel taken from same gas station never gave me problems.
doesn't mean anything. fuel can "go" bad. I'd change stations just in case... even just temporarily.

Quote:
Originally Posted by Cmats_ View Post
fuses have no corrosion. battery is unknown age, previous owner had the bike outside for a period of time. battery reads at 12.73, +/- connections are fine. never had the bikes battery die.
alright still can't rule out the battery. even a battery near the end of its life will read good voltage. check amperage as per the manual

Quote:
Originally Posted by Cmats_ View Post
have not checked the plugs, will do that and r/r when i get home. how do i use the multimeter on my r/r to check it? i dont ride in the rain too much. i will update when i get home and tear it apart.


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post #8 of 21 Old 10-31-2016, 8:49 PM Thread Starter
 
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Plugs are out. All seem to be normal ish. Unless something sticks out to you guys.
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post #9 of 21 Old 11-02-2016, 6:22 PM Thread Starter
 
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Re: 2001 F4i fuel/electric issue.

Kill switch assemby looks clean no corrosion. I still cant get this multimeter testing stuff down so im gonna update after i install a new(ish) r/r and new plugs. Also gonna run a tank of 87 through and see of anything changes. If that fails, i will do a stator and battery. If that fails, i will go forth to really find the source.
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post #10 of 21 Old 11-03-2016, 12:03 AM
 
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Re: 2001 F4i fuel/electric issue.

Am I stating the obvious with the Fuel Pressure Regulator? Unplug the vacuum line whilst it is running and see if fuel comes out... Do not expect it to immediately dump fuel, give it a couple minutes. Sounds like a punctured/torn diaphragm in the FPR causing it to run too-rich and clogging up the vacuum line when you turn it off which will "flood" the bike and make it hard to start.

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post #11 of 21 Old 11-03-2016, 8:32 AM Thread Starter
 
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Re: 2001 F4i fuel/electric issue.

Quote:
Originally Posted by RRDemon View Post
Am I stating the obvious with the Fuel Pressure Regulator? Unplug the vacuum line whilst it is running and see if fuel comes out... Do not expect it to immediately dump fuel, give it a couple minutes. Sounds like a punctured/torn diaphragm in the FPR causing it to run too-rich and clogging up the vacuum line when you turn it off which will "flood" the bike and make it hard to start.
I already replaced the FPR last week when i first encourntered the problem. Said that in the post
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post #12 of 21 Old 11-03-2016, 11:37 AM
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Re: 2001 F4i fuel/electric issue.

Hi Cmats, strange one this looking at the symptoms I would have thought the bike was running rich and yet when you look at the plugs , their almost on the lean side, and you've got a strong petrol smell from the rear, how do the throttle body insulators look attaching to the cylinder head ,are they sucking air, have you tried a fuel flow inspection as per manual, and is the fuel pump working as it should, you could try all these test with the manual, have you cleared the fuel tank air vent hose. Sorry if there's a lot here but it could be a myriad of causes.Bill
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post #13 of 21 Old 11-03-2016, 6:18 PM Thread Starter
 
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Re: 2001 F4i fuel/electric issue.

Quote:
Originally Posted by spagiratwink View Post
Hi Cmats, strange one this looking at the symptoms I would have thought the bike was running rich and yet when you look at the plugs , their almost on the lean side, and you've got a strong petrol smell from the rear, how do the throttle body insulators look attaching to the cylinder head ,are they sucking air, have you tried a fuel flow inspection as per manual, and is the fuel pump working as it should, you could try all these test with the manual, have you cleared the fuel tank air vent hose. Sorry if there's a lot here but it could be a myriad of causes.Bill
I have no manual so i dont know exactly how to check fuel flow inspection. Will update after i check TB insulators and vent hose. Thanks bill
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post #14 of 21 Old 11-04-2016, 3:20 AM
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Re: 2001 F4i fuel/electric issue.

Quote:
Originally Posted by Cmats_ View Post
I have no manual so i dont know exactly how to check fuel flow inspection. Will update after i check TB insulators and vent hose. Thanks bill
Hi Cmats, got a manual for you but you will have to "up" your posts , as I cannot PM you with it. Bill

In the meantime
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post #15 of 21 Old 11-04-2016, 11:32 AM
 
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Re: 2001 F4i fuel/electric issue.

I have a .pdf copy.

Spagiratwink- what's the post count to unlock PMs?

-My 06 Fireblade Build Thread
-Her 02 CBR600F4i Custom Suspension
-My 07 CRF230F sold
-My 97 XR100
-07 CRF50F son's
-92 CB750 She lets me ride it, Jetted
-13 CRF110F, 01XR50 Daughter's

Because 12,000 RPM makes me feel better
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