Engine cough, please help
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Cruiser
Joined: Jun 2005
Posts: 178
Likes: 0
From: Windsor
Engine cough, please help
My 06 Street Bob just began what I call a cough, mostly when its cold but can do it even hot. While gently rolling on the throtle, usually taking off from a start, the bike will have a short fart where it feels like the engine misses and than I can hear a puff sound that appears to be coming out the air breather. It never stalls but its pissin me off. I put new plugs in and it is much better, but it still happens on occasion. Any tips would be greatly apprieciated.
Outstanding HDF Member
Joined: Apr 2006
Posts: 2,555
Likes: 3
From: Clarksburg, PA
My '06 has ran great since I bought...then it started to pop or cough through the air cleaner this year
I replaced plugs, intake seals, and exhaust gaskets. Cleaned / sprayed everything, etc.
I removed my PCIII and pipes and returned it all to stock and still had the problem.
It turned out to be the injector issue and I swapped out the 8°s for 25°s.
It took 10K miles before I had a problem with the 8° injectors...my brother's '06 had them right away.
Luckily, MUD had a set he sold me cheap and I was ab;e to get it fixed quickly and cheaply...good luck with a dealer as they wanted to charge me since it's technically not a recall item.
I replaced plugs, intake seals, and exhaust gaskets. Cleaned / sprayed everything, etc.
I removed my PCIII and pipes and returned it all to stock and still had the problem.
It turned out to be the injector issue and I swapped out the 8°s for 25°s.
It took 10K miles before I had a problem with the 8° injectors...my brother's '06 had them right away.
Luckily, MUD had a set he sold me cheap and I was ab;e to get it fixed quickly and cheaply...good luck with a dealer as they wanted to charge me since it's technically not a recall item.
Thread Starter
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Cruiser
Joined: Jun 2005
Posts: 178
Likes: 0
From: Windsor
Can I just swap out these injectors myself, or is this something that is going to require re-programing after. I bought this bike used from the dealer. It has a stage one with pipes and it was tuned with a Harley race tuner, so they say. They also told me that I dont get the tuner with the bike, that I would have to buy one if I was to make any further changes. Therefore I was wondering if I can switch these injectors without having the bike fully tuned again. What are these injectors worth?
Elite HDF Member
Joined: Aug 2007
Posts: 4,265
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From: Northern VA
When I swapped out my tins this past winter, I installed a new fuel pump assembly while I was at it. This summer, the bike came down with the same 'sneezing' symptoms you describe - complete with hearing the pffffft through the air cleaner. Tried a bunch of things, even taking it to the dealer, and nothing fixed it. I was convinced it was a tuning problem with the FuelPak, so I ordered a PC-V. That made it worse...
The service tech said I should re-install the old fuel pump to eliminate that. (didn't make sense as it ran fine with the new pump half the summer) I installed the old fuel pump and every single problem went away. Even cold start-up is better.
The service tech said I should re-install the old fuel pump to eliminate that. (didn't make sense as it ran fine with the new pump half the summer) I installed the old fuel pump and every single problem went away. Even cold start-up is better.
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Outstanding HDF Member
Joined: Apr 2006
Posts: 2,555
Likes: 3
From: Clarksburg, PA
Can I just swap out these injectors myself, or is this something that is going to require re-programing after. I bought this bike used from the dealer. It has a stage one with pipes and it was tuned with a Harley race tuner, so they say. They also told me that I dont get the tuner with the bike, that I would have to buy one if I was to make any further changes. Therefore I was wondering if I can switch these injectors without having the bike fully tuned again. What are these injectors worth?
I would make sure you eliminate everything else before you go that route as new injectors are like $100 each.
Check for the pinhole leak in the fuel line inside the tank, which seems to happen to a lot of our bikes. It rubs the inside of the tank and wears a hole in it.
My cough was so bad that the bike would stall. It only did it when it was warming up, but then it ran fine after it was hot...this told me that I did not have a leak, which I did confirm by removing the console and checking.
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if you have a tuner that will compensate for the 8* over the 25* on the tuner. (or so the awesome techs at harley told me) if you motor is caughing it is missing... i would start simple as outlined above, by replaceing your exhaust gaskets, check your A/C gasket to be sure that is all tight... what do your plugs look like?
