cbracerx Posted July 12, 2009 Share Posted July 12, 2009 I never thought I would be writing a post like this for my Honda, but here it is. Today I tried to go for a ride on my '99 (stock powertrain except some Leo Vinci slip ons) and it was not running well. It would not rev freely from idle before starting out, and when I tried to get under way it ran with poor power and very flat performance - with a huge stumble off idle. I could hold the throttle open around 10% and it would alternate between running like cr@p and then surging forward as if it was running properly. Ughh. FI light was never on. What are the common possibilities here? TPS, CPS? I should also mention that I disconnected the battery (new in '06) and gave it a few minutes just in case this was a random computer glitch. It did not help. Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted July 12, 2009 Share Posted July 12, 2009 I never thought I would be writing a post like this for my Honda, but here it is. Today I tried to go for a ride on my '99 (stock powertrain except some Loe Vinci slip ons) and it was not running well. It would not rev freely from idle before starting out, and when I tried to get under way it ran with poor power and very flat performance - with a huge stumble off idle. I could hold the throttle open around 10% and it would alternate between running like cr@p and then surging forward as if it was running properly. Ughh. FI light was never on. What are the common possibilities here? TPS, CPS? I should also mention that I disconnected the battery (new in '06) and gave it a few minutes just in case this was a random computer glitch. It did not help. fpr they do go out, because of alcohol. Quote Link to comment Share on other sites More sharing options...
cbracerx Posted July 13, 2009 Author Share Posted July 13, 2009 I never thought I would be writing a post like this for my Honda, but here it is. Today I tried to go for a ride on my '99 (stock powertrain except some Loe Vinci slip ons) and it was not running well. It would not rev freely from idle before starting out, and when I tried to get under way it ran with poor power and very flat performance - with a huge stumble off idle. I could hold the throttle open around 10% and it would alternate between running like cr@p and then surging forward as if it was running properly. Ughh. FI light was never on. What are the common possibilities here? TPS, CPS? I should also mention that I disconnected the battery (new in '06) and gave it a few minutes just in case this was a random computer glitch. It did not help. fpr they do go out, because of alcohol. Thanks! I saw your response on the other rough running thread - appreciate it. If my FPR fails the test, do you recommend this version from turbo city to replace it? http://www.turbocity.com/product_info.php?...products_id=572 EDIT: I see that you have recommended this part already Quote Link to comment Share on other sites More sharing options...
cbracerx Posted July 13, 2009 Author Share Posted July 13, 2009 I just lifted and supported the tank, then removed the vacumn line from the FPR. No fuel dripped out. I then turned the ignition on but did not start the bike - still no fuel drips. Did I do the test properly? Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted July 13, 2009 Share Posted July 13, 2009 I just lifted and supported the tank, then removed the vacumn line from the FPR. No fuel dripped out. I then turned the ignition on but did not start the bike - still no fuel drips. Did I do the test properly? yes, might as well go ahead and start it and see, hold your finger over the hose to stop the vacumn leak, and watch for fuel. If that is not it, your going to have to see what the plugs look like. if I remember corectly 2 and 3 are the ones that foul due to the FPR.. May have got to it early and not leaking that much yet. Quote Link to comment Share on other sites More sharing options...
cbracerx Posted July 13, 2009 Author Share Posted July 13, 2009 I just lifted and supported the tank, then removed the vacumn line from the FPR. No fuel dripped out. I then turned the ignition on but did not start the bike - still no fuel drips. Did I do the test properly? yes, might as well go ahead and start it and see, hold your finger over the hose to stop the vacumn leak, and watch for fuel. If that is not it, your going to have to see what the plugs look like. if I remember corectly 2 and 3 are the ones that foul due to the FPR.. May have got to it early and not leaking that much yet. So the test with it running showed no leaking, and the motor ran fine until I reconnected it - then it started to act up! So I went ahead and bought the mucho-expensive FPR from Turbo City as that seems to have benefits anyway. Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted July 13, 2009 Share Posted July 13, 2009 I just lifted and supported the tank, then removed the vacumn line from the FPR. No fuel dripped out. I then turned the ignition on but did not start the bike - still no fuel drips. Did I do the test properly? yes, might as well go ahead and start it and see, hold your finger over the hose to stop the vacumn leak, and watch for fuel. If that is not it, your going to have to see what the plugs look like. if I remember corectly 2 and 3 are the ones that foul due to the FPR.. May have got to it early and not leaking that much yet. So the test with it running showed no leaking, and the motor ran fine until I reconnected it - then it started to act up! So I went ahead and bought the mucho-expensive FPR from Turbo City as that seems to have benefits anyway. I would think that it is going to fail by what you are saying, just not bad yet. Good point though as the vacuum moves the slide to open the fuel back to the tank and would open a cut in the diaphragm that might still be holding due to the valve being closed. I had kept my old one to dissect and have for viewing operation, but, was needed by someone. Never got to do a cutup. If some one wants to send me the old one I will and make a post of it. Quote Link to comment Share on other sites More sharing options...
cbracerx Posted July 14, 2009 Author Share Posted July 14, 2009 I just lifted and supported the tank, then removed the vacumn line from the FPR. No fuel dripped out. I then turned the ignition on but did not start the bike - still no fuel drips. Did I do the test properly? yes, might as well go ahead and start it and see, hold your finger over the hose to stop the vacumn leak, and watch for fuel. If that is not it, your going to have to see what the plugs look like. if I remember corectly 2 and 3 are the ones that foul due to the FPR.. May have got to it early and not leaking that much yet. So the test with it running showed no leaking, and the motor ran fine until I reconnected it - then it started to act up! So I went ahead and bought the mucho-expensive FPR from Turbo City as that seems to have benefits anyway. I would think that it is going to fail by what you are saying, just not bad yet. Good point though as the vacuum moves the slide to open the fuel back to the tank and would open a cut in the diaphragm that might still be holding due to the valve being closed. I had kept my old one to dissect and have for viewing operation, but, was needed by someone. Never got to do a cutup. If some one wants to send me the old one I will and make a post of it. PM me your address and I will send you my replaced FPR (if this fixes the problem!). Quote Link to comment Share on other sites More sharing options...
cbracerx Posted August 24, 2009 Author Share Posted August 24, 2009 Update: Many rides later the replacement of the stock FPR with another stock version cured the issues. Thanks for the help! Quote Link to comment Share on other sites More sharing options...
EVLXX Posted August 25, 2009 Share Posted August 25, 2009 Wow, I completely missed this one the first time around.... Oh I was a little busy that week, with PPIHC, but Stan said almost everything I would have told you anyways. Good work Stan. Except that, I have a 99, it did the same thing, no leaky either, new FPR solved the problem, and I concluded it must be due in part to the Ethanol in the fuel. Ethanol eats rubber, and since your FPR was never designed to be running Ethanol, I figure the Ethanol slowly absorbs into the rubber diaphragm until it starts to malfunction (in yours and my case) , or it completely fails as in Stan's case. Anyways glad you got it fixed. Now if I could only find Ethanol approved FPR's for our Bikes........ that would be nice. Because right now, I know my semi-new FPR is going to fail, I just don't know when. Quote Link to comment Share on other sites More sharing options...
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