Just curious on how many people have the EFI bikes. Neal, I know you have tore into yours pretty well. Have you had any more problems since the ones on the "other" board? Mine is in the shop getting it's manifold pressure switch replaced. Whatever the hell that is. Anyway I was just curious. Hopefully there will be enough to open a new forum for us. Ride safe.
How many have the EFI?
- Thread starter kcnjamie
- Start date
I have a 2008 K-9 EFI.
I have a 2008 K-9 EFI with 700 miles of "easy" break-in riding. I've not had a problem with the EFI, but I did have an ignition coil failure at 550 miles. Believe it or not, I was able to make the short ride home just running on the front cylinder. The failure occurred on the coil side that fires the rear cylinder. While in the shop, a new coil and wire set was installed as part of a Big Dog recall.
I have a 2008 K-9 EFI with 700 miles of "easy" break-in riding. I've not had a problem with the EFI, but I did have an ignition coil failure at 550 miles. Believe it or not, I was able to make the short ride home just running on the front cylinder. The failure occurred on the coil side that fires the rear cylinder. While in the shop, a new coil and wire set was installed as part of a Big Dog recall.
Nomad2day
Longhair Redneck Geek
kcnjamie,
It is probably the MAP they are replacing "Manifold Absolute Pressure" sensor. It basically monitors the vacuum and pressure.
The ECU or fuel injection module in our case looks at the inputs IE: the temperature, position, speed and pressure to determine how much fuel and timing to use at whatever load depending on your RPM and the throttle position sensor voltage.
The map they are replacing looks at the barometric pressure and air density your bike is sucking in and the ECU will make adjustments for this also. If it goes out it will give you all kind of fuel problems.
On my blown Mustang with a Intercooled Novi 2000 huffer, I trounced it one day and blew the inlet hose off after the maf and it instantly started dumping fuel and running like pure do do for the lack of the proper word due to my wife standing here.
Big Dog has replaced my throttle body, ignition, crank sensor, coil wires, EHC and loaded numerous maps to try and stop mine from coughing out of the throttle body just off idle and dying among other stuff. Said they had some faulty shafts in the throttle bodies allowing air to enter the system. Mine still will cough but has not died
I agree we will need a section for the efi area soon and hope the mothership will step in and give some good information. I will throw out any info I can.
When my bike is returned to me perhaps we will have a lot to talk about.
I have tried to leave the bad times back on the other forum and want to provide some good positive information and thoughts for those with EFI and perhaps some alternatives to the Big Dog installed S&S VFI.
Do not be afraid to hook up to your bike to monitor your alarms and gauge readings with the Pro Tune II software off of the S&S site.
ProTune II Software Download
You can't do anything but look and it is good to see what alarms might be being triggered that are not setting off the check engine light or causing it to go on and off. Go to the S&S site and download the PDF's on the VFI system and it's components and save them to your hard drive. Some really good information here.
Sulconst2 here posted a Diagnostic Flow Chart Troubleshooting Guide. Talk about some more awesome information you should have. Post #22 here
http://www.bigdogbiker.com/forums/swap-meet/1808-diagnostics.html
Will walk you through your checks and tells you what you should see.
How many times has someones bike sat in the shop just for them to check it out to tell you if it is safe to ride. Don't even think about getting some black painted side covers from BDM in any kinda time frame.
Boy my first year did really suck....well June will be a year
Neil in Tenn
It is probably the MAP they are replacing "Manifold Absolute Pressure" sensor. It basically monitors the vacuum and pressure.
The ECU or fuel injection module in our case looks at the inputs IE: the temperature, position, speed and pressure to determine how much fuel and timing to use at whatever load depending on your RPM and the throttle position sensor voltage.
The map they are replacing looks at the barometric pressure and air density your bike is sucking in and the ECU will make adjustments for this also. If it goes out it will give you all kind of fuel problems.
On my blown Mustang with a Intercooled Novi 2000 huffer, I trounced it one day and blew the inlet hose off after the maf and it instantly started dumping fuel and running like pure do do for the lack of the proper word due to my wife standing here.
Big Dog has replaced my throttle body, ignition, crank sensor, coil wires, EHC and loaded numerous maps to try and stop mine from coughing out of the throttle body just off idle and dying among other stuff. Said they had some faulty shafts in the throttle bodies allowing air to enter the system. Mine still will cough but has not died
I agree we will need a section for the efi area soon and hope the mothership will step in and give some good information. I will throw out any info I can.
When my bike is returned to me perhaps we will have a lot to talk about.
I have tried to leave the bad times back on the other forum and want to provide some good positive information and thoughts for those with EFI and perhaps some alternatives to the Big Dog installed S&S VFI.
Do not be afraid to hook up to your bike to monitor your alarms and gauge readings with the Pro Tune II software off of the S&S site.
ProTune II Software Download
You can't do anything but look and it is good to see what alarms might be being triggered that are not setting off the check engine light or causing it to go on and off. Go to the S&S site and download the PDF's on the VFI system and it's components and save them to your hard drive. Some really good information here.
Sulconst2 here posted a Diagnostic Flow Chart Troubleshooting Guide. Talk about some more awesome information you should have. Post #22 here
http://www.bigdogbiker.com/forums/swap-meet/1808-diagnostics.html
Will walk you through your checks and tells you what you should see.
How many times has someones bike sat in the shop just for them to check it out to tell you if it is safe to ride. Don't even think about getting some black painted side covers from BDM in any kinda time frame.
Boy my first year did really suck....well June will be a year
Neil in Tenn
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Nomad2day
Longhair Redneck Geek
rwill20,
Good looking scoot. You should upload some pics to the gallery so we can drool on the paint job.
Check the cough out as the weather starts to heat. Mine would stall in the summer months when it got hot outside. When it came back from BDM it had a new exhaust put on it and all the electronics they changed out. The weather started to cool down also. Try to pull out across a divided 4 lane median and die. Lot of bike to try and move in a hurry when it dies.
A cough through the throttle body can point to a leaking intake manifold or in my opinion a problem with the map not being able to handle a gulp of air.
Neil in Tenn
Good looking scoot. You should upload some pics to the gallery so we can drool on the paint job.
Check the cough out as the weather starts to heat. Mine would stall in the summer months when it got hot outside. When it came back from BDM it had a new exhaust put on it and all the electronics they changed out. The weather started to cool down also. Try to pull out across a divided 4 lane median and die. Lot of bike to try and move in a hurry when it dies.
A cough through the throttle body can point to a leaking intake manifold or in my opinion a problem with the map not being able to handle a gulp of air.
Neil in Tenn
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rwill20
Well-Known Member
Thanks Nomad,not any good at this computer stuff,have to peck it out just to post,still have my 18 year old home but can't stop him long enough to do it.He's in sheet metal school,works as it allows,and his gal helping me on this isn't high on his list.If ya'll new how long this took me you'd all be rolling.:bang:
Now that nomad brings it up last year when I went to the telegraph cruise traffic was bumper to bumper in certain areas and when it was stop and bearly go the dog seamed like it was loaden up somethin feirce so I pulled over let it cool then went down a side street to blow it out and it finally straightend out but wait my bike doesnt have a carb so this shouldnt happen right
Nomad2day
Longhair Redneck Geek
Yea Chris it has a head temperature sensor besides the intake air temp sensor.
It is located in the front cylinder as the lower intake bolt per say. It's purpose is to measure cylinder head temp it is relative to the timing curve and fuel adjustments that will be made.
The EFI also has a skip fire feature. Most people think of it as the rev limiter function but it does some other stuff.
As Bighouse experienced in his slow moving bumper to bumper travels it translates like this.
It has 3 levels or steps of a thermal interference...
At 350F degree's, the engine misses on out of 9 hits "combustion" and is overheating
At 365F degree's, the engine will miss one out of 7 and it will be running much rougher that you will notice and at 375F degree's it is one out of 5 and as you would guess, you are on the side of the road.
It is systematically dropping the combustion hits and dumping raw fuel in to try and cool the engine. At 325F it will run normal.
There is a couple other things happening but this should give you a ballpark view of what is happening.
If I get off track some, someone step in explain it in better terms so we can tie it all together correctly.
Neil in Tenn
It is located in the front cylinder as the lower intake bolt per say. It's purpose is to measure cylinder head temp it is relative to the timing curve and fuel adjustments that will be made.
The EFI also has a skip fire feature. Most people think of it as the rev limiter function but it does some other stuff.
As Bighouse experienced in his slow moving bumper to bumper travels it translates like this.
It has 3 levels or steps of a thermal interference...
At 350F degree's, the engine misses on out of 9 hits "combustion" and is overheating
At 365F degree's, the engine will miss one out of 7 and it will be running much rougher that you will notice and at 375F degree's it is one out of 5 and as you would guess, you are on the side of the road.
It is systematically dropping the combustion hits and dumping raw fuel in to try and cool the engine. At 325F it will run normal.
There is a couple other things happening but this should give you a ballpark view of what is happening.
If I get off track some, someone step in explain it in better terms so we can tie it all together correctly.
Neil in Tenn
(knock on fake wood desk) thats the best!:2thumbs:
Nomad2day
Longhair Redneck Geek
For some reason, I think that it would haunt you like a bad ex-wife or girl friend...
One "IAT" is directly affecting the fuel and timing tables for operation by sending a resistance value to the ECU.
I like the way you think on the "HTS". I do not know if it is directly tied into the fuel pump circuit for it to just work. Something I can test out whenever I get my bike back. I will look at the schematics on it though and see.
As a after though here, does a carb bike even have a fuel pump or is it just gravity?
Thanks,
Neil in Tenn