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Gitter
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« on: November 10, 2014, 06:53:25 PM » |
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I Bought a 2001 IS about 2 months ago. I have a real bad back firing problem on the left side. I have tried to tighten up the boots thinking maybe it was a vacuum leak. I just changed out the petcock valve and it seems to be a little worse. When I say back firing I mean like a gun going off. Any help or suggestions would be greatly appreciated.
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Kevin
1997 Standard "The Jet"
2000 Valkyrie IS
2001 Valkyrie IS
2000 Valkyrie IS
1986 Honda Shaddow
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Bighead
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« Reply #1 on: November 10, 2014, 06:59:06 PM » |
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You have a vacuum leak somewhere, do a desmogged on it and get rid of all of those hoses under there.
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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salty1
Member
Posts: 2359
"Flyka"
Spokane, WA or Tucson, AZ
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« Reply #2 on: November 11, 2014, 04:15:30 AM » |
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Also make sure you header nuts are not loose.? ???
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My rides: 1998 GL1500C, 2000 GL 1500CF,2006 GL 1800 3A   |
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IamGCW
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« Reply #3 on: November 11, 2014, 05:21:54 AM » |
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Intake O rings may be bad. Vacuum hoses bad. Loose intake clamps (three per cylinder?).
Maybe check the plugs for clues.
73
Gil
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Gil
uıɐƃɐ ʎɐqǝ ɟɟo pɹɐoqʎǝʞ ɐ ʎnq ɹǝʌǝu ןן,ı
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #4 on: November 11, 2014, 07:16:56 AM » |
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It sounds as though you have a vacuum leak or two or three, as the others mentioned. Check or better yet replace the vacuum lines and the vacuum caps.
Once thats done, if it continues, you have varnished low jets.
An easy way to check is to spray some ether [start fluid] around the base of the intakes [while idling] and see which ones make any difference.
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sandy
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« Reply #5 on: November 11, 2014, 07:49:14 AM » |
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If none of those suggestions work, check the cam timing belt on that side. You didn't mention mileage but the cam belt may have jumped a tooth or two.
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Rocketman
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« Reply #6 on: November 11, 2014, 08:43:07 AM » |
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I expect popping when there's a vacuum leak, but actual backfiring? Isn't that a symptom of something else?
Mark
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #7 on: November 11, 2014, 10:52:34 AM » |
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I expect popping when there's a vacuum leak, but actual backfiring? Isn't that a symptom of something else?
Mark
I recently lost an intake plug and it backfired on decel. |
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Ricky-D
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« Reply #8 on: November 11, 2014, 11:33:22 AM » |
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I don't recall ever, anything about a slipped timing belt, all the years, in this forum.
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2000_Valkyrie_Interstate
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Gitter
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« Reply #9 on: January 21, 2015, 07:46:49 PM » |
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I wanted to give an update. I decided to desmog my bike to see if this would help with the back firing. While tearing it down to get to the emission control parts when I took the air cleaner box out and disconnected all six carbs I found that two of the rubber boots were folded in and allowing air to be sucked it. After replacing the boots and desmogging it I took a test ride today and had no back firing and it ran great. Thanks to everyone for the advice.
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Kevin
1997 Standard "The Jet"
2000 Valkyrie IS
2001 Valkyrie IS
2000 Valkyrie IS
1986 Honda Shaddow
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Bighead
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« Reply #10 on: January 21, 2015, 08:13:16 PM » |
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Glad you found the culprit.  |
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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salty1
Member
Posts: 2359
"Flyka"
Spokane, WA or Tucson, AZ
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« Reply #12 on: January 22, 2015, 12:51:46 PM » |
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Thanks for posting an update.
Ditto |
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My rides: 1998 GL1500C, 2000 GL 1500CF,2006 GL 1800 3A |
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