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Author Topic: Exhaust Backfire  (Read 9791 times)

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103_RK

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Exhaust Backfire
« on: September 22, 2005, 05:49:19 AM »
I have an intermittant backfire through the exhasut.  This is a 2003 SERK (103" Road King).  Everything seems to be fine when I ride to work in the AM, also if I ride out to lunch all is well.  When I leave work in the afternnon after the bike has cooled for approx. 3 hours it tends to backfire through the exhaust.  The temp. is usually in the mid 80's to low 90's in the afternnon. I have Electronic Feul Injection and was wondering if one of the injectors was leaking into the intake or what could cause this.  I have the SE air filter and Rinehart exhasut with stage one EFI remap.  Thanks in advance for any tips.

103_RK
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103 RK
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grc

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Re: Exhaust Backfire
« Reply #1 on: September 22, 2005, 07:57:53 AM »
It appears from your description that this could be a temperature related issue - I would first have the temp sensors checked out.  H-D has had a lot of issues with intermittent or out of spec sensors.  I'm planning to pull both of mine, cylinder head and intake air, and check them at various temps against the specs.  I have the opposite problem; bike runs OK at low speeds when hot, runs like chit when cold (below 70 ambient temp).
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Jerry - 2005 Cherry SEEG  -  Member # 1155

H-D and me  -  a classic love / hate relationship.  Current score:  love 40, hate 50, bewildered 10.

Ed Ramberger - One_Screamin_Eagle

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Re: Exhaust Backfire
« Reply #2 on: September 22, 2005, 11:41:34 PM »
Quote
I have an intermittant backfire through the exhasut.
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FLTRSEI -Delphi Conversion, 103", 251 cams, Heavy Breather & a couple other little tweaks

103_RK

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Re: Exhaust Backfire
« Reply #3 on: September 23, 2005, 07:18:08 AM »
Thanks, I am planning to get the race tuner.  It will have to wait for funds though.
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103 RK
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103_RK

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Re: Exhaust Backfire
« Reply #4 on: September 23, 2005, 07:21:01 AM »
If I can find specs for the sensors, I will check them.  I don't have money right now to spend a lot of delor time checking things out that are occasional.  Most days it does not do anything wrong.  When it backfirs, it is only the one time on startup.  Afterwards it runs fine.
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103 RK
2003 FLHRSEI2

HDJamsTX

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Re: Exhaust Backfire
« Reply #5 on: September 23, 2005, 11:06:50 PM »
103 RK, not sure of when or where your going to get your RT, but
here is the link to chicago HD and they offer 25% off on all HD items.
http://www.chicagoharley.com
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Unbalanced

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Re: Exhaust Backfire
« Reply #6 on: September 23, 2005, 11:18:58 PM »
Only offered me 20 percent off on my new wiring harness for the road king only problem was they sent me another police harness and I needed the standard road king one .... /sigh
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HBRR Florida Chapter,  STILL - The Fastest Chapter - Proven yet again Bikeweek 2017

103_RK

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Re: Exhaust Backfire
« Reply #7 on: September 24, 2005, 07:22:41 AM »
Thanks for the tip om CHicag Harley.  i use them when I'm buying something expensive like this.  I usually check ebay first.  
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103 RK
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103_RK

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Re: Exhaust Backfire
« Reply #8 on: September 28, 2005, 06:06:37 AM »
I wonder if the exhaust backfire can be from an injector?  When the the ignition is turned on and the kill switch is set to "run" you always hear the fuel pump on EFI bikes.  What stops the fuel from entering the cylinder?  Is it the injector or is there a regulator?  I thought the injectors only allowed fuel when told by the ECM.  If there is a problem with too much fuel entering the cylinder, what would be the most likely cause?  THis is only on warm starts.  It never happens on cold first starts for the day.  If I buy a race tuner, can I play with the warm start settings?
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grc

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Re: Exhaust Backfire
« Reply #9 on: September 28, 2005, 10:50:59 AM »
Quote
I wonder if the exhaust backfire can be from an injector?
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Jerry - 2005 Cherry SEEG  -  Member # 1155

H-D and me  -  a classic love / hate relationship.  Current score:  love 40, hate 50, bewildered 10.

TB

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Re: Exhaust Backfire
« Reply #10 on: September 28, 2005, 10:53:55 AM »
I would try to follow the KISS method and check out the easy things first.

Did the condition first manifest itself after the change in exhaust?  If it did, I would check for an exhaust gasket leak at the head.  I would check it anyway as they can loosen over time.  Cool air is drawn into the system causing flame throwing and backfiring particularly on deacceleration.

TB
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TB
2008 FLHX, 103 Big Bore, SE Air Cleaner and re-map, Klock Werk windshield.
2005 Assembled - Grim Reap'r -100ci RevTech, Prowler frame.
1993 Sportster - Steam Roll'r - 1200cc, 200 front tire, Paucho springer.
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PCC

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Re: Exhaust Backfire
« Reply #11 on: September 28, 2005, 01:37:42 PM »
The Stage I re-map is the culprit...there is some small amount of fuel still injected at 0% throttle opening. With a PC or Race tuner you can dial this out and ...no more backfire. That IS the KISS! [smiley=7.gif]
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103_RK

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Re: Exhaust Backfire
« Reply #12 on: October 03, 2005, 06:47:03 AM »
TB, this is a true backfire.  Sounds like a gunshot.  It didn't start with the exhaust change.  It is not a popping on deceleration.  I do have that as well but that is something that I paln to fix as soon as my funds allow me to purchase the race tuner.
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103_RK

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Re: Exhaust Backfire
« Reply #13 on: October 03, 2005, 06:50:21 AM »
PCC, Thanks and as soon as I can purchase the race tuner, I will.  I can start the bike fast by not waiting for the check engine and alarm light to go out.  This seems to not allow time for the fuel to get in there and backfire.  
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103_RK

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Re: Exhaust Backfire
« Reply #14 on: October 03, 2005, 06:54:15 AM »
grc, WHat if I just find a temperature sensor on ebay and replace it?   I sometimes see a map sensor or other sensor listed and wonder if I find the corrrect sensor that is the problem if I should just take a chance and still avoid the dealor high labor.  I need to try to save $'s as I still need a bck tire before next season and can only spend so much on the bike without cutting too many other things short.
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103 RK
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