A friend has a 2011 Street Glide. When he's cruising along at 2500 RPM, in any gear, once in a while the engine "bumps". He describes it as if you have a momentary contact switch hooked to the ignition and tap it once in a while, so that it shuts off the engine for a split second. Sometimes it's one bump, other times it can be 2 or 3 in a row.

Sometimes the bump is so violent that it kicks off his cruise control.

It sometimes just does it once, then doesn't happen for quite a while. Other times it happens often. But always at around 2500 RPMs. His definition of once in a while is between 15 minutes and 45 minutes.

All of the connectors associated with throttle have been cleaned by his dealer, and dielectric grease applied. It's not gas, since it's been going on since last fall.

I'm thinking Throttle Position Sensor, but his dealer says they have never had to replace an Induction Module on a touring bike since they changed the design. I'm thinking they are wrong.

I told my friend that some of you are freaking geniuses....... don't make a liar out of me.

 

All stock? What mods? Exhaust? AC? How many miles? What gas is he buying? New plugs? Plug Wires?

All factors to consider for diagnosis.

 

All stock. He hasn't even added chrome.

Dealer has replaced plugs, wires, cleaned connections. 40,000 miles or so.

 

Ignition switch going bad?

 

Wire breaking down to the run switch and the wire causes a momentary "Off" condition as if the switch were momwntarily put in the off position. Just a guess.

 

I had a fault coming in the O2 sensor that made the bike surge then let off, apparently the wire had a break; it was fixed in less than an hour by the dealer; gas mileage also decreased. Just an idea.

 

I considered that. But when I rode his bike and it did the bump a couple of times, it didn't kick off the cruise control. If the ignition switch, or kill switch, did that, it should kill the cruise.


I would think that would throw a code. And that is something I forgot to mention..... no codes thrown.

 

ECM plugged all the way in and tight? Just a shot in the dark.

 

I'd guess a lean misfire. Check intake system for a leak, perhaps a vacuum tap open? If intake checks good, make sure contacts for O2 sensors wiring aren't corroded; clean & re-seat connections & ECM connectors too.

 

Yes it did, should have mentioned that.