Popping exhaust and bad fuel mileage - Wrist Twisters
 
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post #1 of 24 Old 07-18-2013, 06:27 PM Thread Starter
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Popping exhaust and bad fuel mileage

So my 2002 VFR is making a "poomp poomp" noise randomly at idle. I noticed it about a week ago at a stoplight and it seems to have gotten worse. I don't seem to be losing power, but my gas mileage was 28 at my last fill up! It also only seems to come from one pipe.

Spark plugs? The bike only has 10k miles, you would think they'd be fine. This is caused by running to rich right?

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post #2 of 24 Old 07-18-2013, 06:33 PM
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Quote:
Originally Posted by TheBeeDeeGee View Post
So my 2002 VFR is making a "poomp poomp" noise randomly at idle. I noticed it about a week ago at a stoplight and it seems to have gotten worse. I don't seem to be losing power, but my gas mileage was 28 at my last fill up! It also only seems to come from one pipe.

Spark plugs? The bike only has 10k miles, you would think they'd be fine. This is caused by running to rich right?
Vacuum leak. Trace which side that pipe is going to and check any vacuum lines on that side TBs

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post #3 of 24 Old 07-18-2013, 07:04 PM Thread Starter
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So

1. vacuum lines
2. spark plugs?
3. starter valave sync?

or am I over thinking this

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post #4 of 24 Old 07-18-2013, 07:12 PM
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Quote:
Originally Posted by TheBeeDeeGee View Post
So

1. vacuum lines
2. spark plugs?
3. starter valave sync?

or am I over thinking this
Oil change? Bad gas or running incorrect octane? Has it been sitting? I've put 10k miles on my 9er in the first year I have owned it lol. Does it have a power commander?

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post #5 of 24 Old 07-18-2013, 07:24 PM
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Quote:
Originally Posted by TheBeeDeeGee View Post
So

1. vacuum lines
2. spark plugs?
3. starter valave sync?

or am I over thinking this
I would put "check exhaust headers for leak" at #2. Especially where it meets the block.

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post #6 of 24 Old 07-18-2013, 07:25 PM
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How about the FPR?

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post #7 of 24 Old 07-18-2013, 07:40 PM Thread Starter
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Quote:
Originally Posted by redline919 View Post
Oil change? Bad gas or running incorrect octane? Has it been sitting? I've put 10k miles on my 9er in the first year I have owned it lol. Does it have a power commander?
I bought it with 7500 miles in March lol, I've put those on since then.

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post #8 of 24 Old 07-22-2013, 07:24 PM Thread Starter
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I couldn't find anything loose with the vacuum lines or headers. You can smell the gas coming out of the exhaust.

A couple of time at the track I had to give it throttle to get it to crank up.

I'm stumped, and I really don't want to have to pay to take it to the shop

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post #9 of 24 Old 07-22-2013, 07:28 PM
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^screams bad FPR

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post #10 of 24 Old 07-22-2013, 07:36 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
^screams bad FPR
I'll look into this.

Is there anyway to test it, or is it cheap enough to just pick up and replace?

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-2005 CBR 600 F4i
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post #11 of 24 Old 07-22-2013, 07:55 PM Thread Starter
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Nashville Motorcycle Repair 2003 Honda VFR800 running problem

I just read about failed FPR on 2002 VFR's.

I saw liquid in the throttle bodies when I opened her up. Look like gas dumping in?
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File Type: jpg IMG-20130719-00033.jpg (331.2 KB, 24 views)

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post #12 of 24 Old 07-22-2013, 08:01 PM
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It's documented elsewhere on here that to check for a bad fpr on a 9er to start the bike and check if the inner headers stay cool while the outer get hot. I'm not sure how this could be adapted to a vfr. Maybe just see if all the headers seem to heat up relatively evenly? I'm sure someone else will chime in with a better idea.

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post #13 of 24 Old 07-22-2013, 08:52 PM
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It does sound a lot like a vacuum leak. Unfortunately I do not know the workings of the 02 VFR fuel setup to help further.

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post #14 of 24 Old 07-22-2013, 10:55 PM
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post #15 of 24 Old 07-23-2013, 05:03 PM Thread Starter
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Is it possible to open up the FPR and see if the diaphram is busted?

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post #16 of 24 Old 07-23-2013, 09:40 PM
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Quote:
Originally Posted by TheBeeDeeGee View Post
Is it possible to open up the FPR and see if the diaphram is busted?

Run the bike, rev it and let the throttle snap shut a couple of times.

Shut the bike off then pull the vacuum tube off of the FPR and see if there is any gas in it or smells like gas...

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post #17 of 24 Old 07-24-2013, 01:15 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
Run the bike, rev it and let the throttle snap shut a couple of times.

Shut the bike off then pull the vacuum tube off of the FPR and see if there is any gas in it or smells like gas...
I'll try this tonight.

I'm really hoping this is it. It seems to match that post you linked. I could see some fuel in two of the throttle bodies above the butterflies, like what was described.

The weird thing is it runs fine otherwise. Just pops at idle, and has terrible gas mileage. So it would have to be a small tear in this diaphram they mention and not a complete failure.

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
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post #18 of 24 Old 07-24-2013, 06:55 PM Thread Starter
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OK, thanks a ton nd4 for suggesting to pull the vacuum line to the FPR.

I pulled it, turned the key.....and fuel dripped out. BINGO, bad FPR.

Here are the pics just to be sure I'm seeing the right thing. In the picture you can see the FPR, and I pulled what I am pretty sure had to be the vacuum line, but I want to be 100%.

You can see the port where the vacuum line was at the bottom, with the large hose on the left coming from the fuel tank.
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File Type: jpg IMG-20130724-00041.jpg (298.1 KB, 15 views)
File Type: jpg IMG-20130724-00042.jpg (207.1 KB, 14 views)

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
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post #19 of 24 Old 07-25-2013, 04:55 PM
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Yup that's it... And called it... In the quick searching I did on the vfr fpr there were some aftermarket higher pressure ones that aided in better low throttle opening motor operation... Do a lil research on the subject

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post #20 of 24 Old 07-25-2013, 05:03 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
Yup that's it... And called it... In the quick searching I did on the vfr fpr there were some aftermarket higher pressure ones that aided in better low throttle opening motor operation... Do a lil research on the subject
Yeah I came across that as well. I think people installed ones from the Blackbird or something.

I already ordered the stock one, but if I find out some more I may return it and upgrade.

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
-2005 CBR 600 F4i
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-2002 VFR 800**SOLD
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post #21 of 24 Old 07-26-2013, 06:30 PM
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The FPR for the VFR is a little harder to get at than with the 919. It is a common issue with that bike also. (I sold my VFR last fall and recall all the disassembly required.)

I think my post #6 did call this first - but who's counting... LOL

Mark

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post #22 of 24 Old 07-26-2013, 06:53 PM Thread Starter
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Quote:
Originally Posted by Mark919 View Post
The FPR for the VFR is a little harder to get at than with the 919. It is a common issue with that bike also. (I sold my VFR last fall and recall all the disassembly required.)

I think my post #6 did call this first - but who's counting... LOL

Mark

Haha, yeah OK guess you did call it first.

What disassembly exactly. Maybe I'm thinking it's going to be simpler than it is. I was hoping the hardest part would be draining/keep fuel from going everywhere when I disconnect the fuel line to the FPR.

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-2005 CBR 600 F4i
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post #23 of 24 Old 07-27-2013, 01:13 PM
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I looked at the VFR service manual again and all you need to do is remove the air cleaner housing to get at the FPR. That's not bad at all but still more work than the 919. (It was the thermostat replacement that required removal of the throttle body assembly on the VFR. That's a bit more work...)
A good forum for information on the VFR is VFRD Home. Good guys and lots of info and repair procedures.
Take care,
Mark

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post #24 of 24 Old 07-27-2013, 03:24 PM
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its no harder than you already have done op... you have gotten to the FPR it looks like it spins off and you are good.

and yes mark you win this round.

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