engine miss and backfire
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Stage II
Joined: Dec 2009
Posts: 2
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engine miss and backfire
I have a 2008 Streatglide. It is pretty much stock. When I first bought the bike, I had air box opened up, a powercomander added as well as true dual Rienharts. All the wrok was done at once using a dyno. The bike works great and i've put about 20,000km on it to date.
During my road trip ( to BBQ in Arkansa -highly recommend), I was tooling along down the highway , when the engine died and then shot back to life, with a backfire. It happened a couple of times, dying for 1- 2 sec each time and then coming back to live. I figure it was definately electrical becasue when it did start to fire again, I would often get a backfire.
This happened the first day after we arrived in Fayetteville and earlier that morning I had presuure washed the bike in one of those coin op car washes. I've done this before when on trips with my 01 Heritage and never had trouble.
I went to the local dealer and put it on the analyser and all it showed was a misfire in the history. I figured I must have gotten something wet and once back at the hotel went through all the electrical connects I could get at and had a look at the powercomander under the set and it was bone dry.
I passed it off as a one off and then it happened again the next day. As quickly as it would start it, would stop agin and it worked great other than that. We left to come home and that day it happened twice more.
I stopped in Little Rock and put a new set of plugs in thinking I may have a bad plug. I should point out that when the bike died, I still hafd all power, lights, etc. I just lost engine fire.
After changing the plugs, it ran strong the rest of the day and then just before stopping for the night it did it again.
After that it hasn't done it since. The drive home was four days and the last day was spent in rain.
Has anyone experienced anything like this or do you have an idea of what might cause this?
During my road trip ( to BBQ in Arkansa -highly recommend), I was tooling along down the highway , when the engine died and then shot back to life, with a backfire. It happened a couple of times, dying for 1- 2 sec each time and then coming back to live. I figure it was definately electrical becasue when it did start to fire again, I would often get a backfire.
This happened the first day after we arrived in Fayetteville and earlier that morning I had presuure washed the bike in one of those coin op car washes. I've done this before when on trips with my 01 Heritage and never had trouble.
I went to the local dealer and put it on the analyser and all it showed was a misfire in the history. I figured I must have gotten something wet and once back at the hotel went through all the electrical connects I could get at and had a look at the powercomander under the set and it was bone dry.
I passed it off as a one off and then it happened again the next day. As quickly as it would start it, would stop agin and it worked great other than that. We left to come home and that day it happened twice more.
I stopped in Little Rock and put a new set of plugs in thinking I may have a bad plug. I should point out that when the bike died, I still hafd all power, lights, etc. I just lost engine fire.
After changing the plugs, it ran strong the rest of the day and then just before stopping for the night it did it again.
After that it hasn't done it since. The drive home was four days and the last day was spent in rain.
Has anyone experienced anything like this or do you have an idea of what might cause this?
I have a 2008 Streatglide. It is pretty much stock. When I first bought the bike, I had air box opened up, a powercomander added as well as true dual Rienharts. All the wrok was done at once using a dyno. The bike works great and i've put about 20,000km on it to date.
During my road trip ( to BBQ in Arkansa -highly recommend), I was tooling along down the highway , when the engine died and then shot back to life, with a backfire. It happened a couple of times, dying for 1- 2 sec each time and then coming back to live. I figure it was definately electrical becasue when it did start to fire again, I would often get a backfire.
This happened the first day after we arrived in Fayetteville and earlier that morning I had presuure washed the bike in one of those coin op car washes. I've done this before when on trips with my 01 Heritage and never had trouble.
I went to the local dealer and put it on the analyser and all it showed was a misfire in the history. I figured I must have gotten something wet and once back at the hotel went through all the electrical connects I could get at and had a look at the powercomander under the set and it was bone dry.
I passed it off as a one off and then it happened again the next day. As quickly as it would start it, would stop agin and it worked great other than that. We left to come home and that day it happened twice more.
I stopped in Little Rock and put a new set of plugs in thinking I may have a bad plug. I should point out that when the bike died, I still hafd all power, lights, etc. I just lost engine fire.
After changing the plugs, it ran strong the rest of the day and then just before stopping for the night it did it again.
After that it hasn't done it since. The drive home was four days and the last day was spent in rain.
Has anyone experienced anything like this or do you have an idea of what might cause this?
During my road trip ( to BBQ in Arkansa -highly recommend), I was tooling along down the highway , when the engine died and then shot back to life, with a backfire. It happened a couple of times, dying for 1- 2 sec each time and then coming back to live. I figure it was definately electrical becasue when it did start to fire again, I would often get a backfire.
This happened the first day after we arrived in Fayetteville and earlier that morning I had presuure washed the bike in one of those coin op car washes. I've done this before when on trips with my 01 Heritage and never had trouble.
I went to the local dealer and put it on the analyser and all it showed was a misfire in the history. I figured I must have gotten something wet and once back at the hotel went through all the electrical connects I could get at and had a look at the powercomander under the set and it was bone dry.
I passed it off as a one off and then it happened again the next day. As quickly as it would start it, would stop agin and it worked great other than that. We left to come home and that day it happened twice more.
I stopped in Little Rock and put a new set of plugs in thinking I may have a bad plug. I should point out that when the bike died, I still hafd all power, lights, etc. I just lost engine fire.
After changing the plugs, it ran strong the rest of the day and then just before stopping for the night it did it again.
After that it hasn't done it since. The drive home was four days and the last day was spent in rain.
Has anyone experienced anything like this or do you have an idea of what might cause this?
Unplug the pc and plug it back to stock if it runs great it could be the pc
Or it is your ecm or throttle pis senor or you need the upgrad download form HD Dealer... they all ready have 2 or 3 upgrades for your bike for downloads. and check your battery cables or spark plug wires they could be loose. and check you pc plug too.
Intermediate
Joined: Nov 2009
Posts: 41
Likes: 0
From: Toledo-Ohio
Harley has a recall on the electonic throttle and sensor has a known short-see your local dealer, my buddys 2008 ultra classic did the same thing his would back fire and free -rev,harley fixed the short and reset the computer.
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
Likes: 34
From: USA
You probably have water in your electronics. never use a high pressure washer on a motorcycle as it forces water into places you don't want it. Take a hair dryer and dry out your fuse box, coils, connectors under seat and PC. Pull each fuse and relays one by one, dry out fuse box, clean contacts with steel wool and apply permatex dielectric grease to the prongs and reinstall.
Once it is all 100% dry see what happens. Don't ask me how I know about this.
Once it is all 100% dry see what happens. Don't ask me how I know about this.
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