I can hear mine click when run switch is flipped

11 Softail with add on harness

Doesn't take much to affect them, make sure your cranking voltage is good

 

Are you sure youre not hearing the injectors deliver the prime pulse that is delivered at power up?

 

Yes, doesn't make the noise with ACR's unplugged

 

Friend of mine sent me this when I was trying to diagnose mine


I ended up replacing my battery

OP is getting a code so ECM is detecting a fault somewhere, my advice to them is to get the correct service manual for their bike and follow the diagnostic for that particular code

 

Its a very audible click,mine came after Harley issued a software update on the S models with the 110 motor. The bikes wouldn't start on the first cranks and kick back but fired on the next,was beating up the battery pretty good especially when cold.

 

Deceleration of what, the piston? So you’re implying the code in the ECM is seeing a decrease in flywheel tooth speed across the CPS and incorporating that data into a certain MAP signal (even though the opposite cylinder is sharing that same MAP sensor) and engaging the ACR accordingly???

What you’re doing here is assuming the engineers at Harley are savvy enough to design something like this. Considering they can’t even isolate what’s causing the sumping and fluid transfer in the M8, I stand by my original skepticism.

 

You're very skeptical, but this is one time you're pretty far off base. I'm not assuming anything, I'm sharing facts.

The missing tooth on the flywheel indicates that x many teeth later is a TDC event on a certain cylinder. Since there isn't a cam sensor and it is a single fire coil, the ECM has to determine if it is TDC Compression or TDC Exhaust (as well as which cylinder) in order to find engine phase and throw spark in proper time. The ECM sees flywheel deceleration on a compression event and because it has seen the missing tooth, it knows its a TDC event on a particular cylinder - it then finds engine phase. It can then verify by comparing to the MAP signal deltas read at specific moments in time. This is why some stock compression engines with S&S easy starts or compression releases had a hard time starting and why the spark plugs need to be installed when checking for spark.

While you may not believe this because you can't conceive it possible, I assure you it's true. It's basic Delphi EFI strategy and it's used in H-D EFI.

Regarding the ACR activation - when Auto ACRs were released, we were specifically told by engineering that they were activated on the compression stroke. If a software update sometime later has changed that, I do not know. But yes - the technology is certainly there to activate them on only the compression stroke - it's the same as throwing spark at the correct time.

 

If what you say is true, why doesn't the video above show the ACR opening and closing multiple times during cranking over a few seconds?

 

If you read my post I acknowledged the software strategy may have changed.

What I have described is factual. I don’t need to prove anything. I’m just sharing factual info.

 

how did you fix this? Mine is doing the exact same thing. My ACR’s used to make the click noise when keying the ignition and would start perfect. Now I’m getting ACR codes and it no longer makes the clicking ACR noise when keying the ignition and it won’t start on first crank. It kicks back and then starts rough on the second start attempt. Once started the bike runs great now.