Cylinder 1 Misfire Under Throttle

[FrickingReallySlow]

cool, keep us posted on your cleaned injectors results!

[Butterballz]

Bad news on the update. Cleaning the direct and port injectors did not fix the issue. Misfire on cylinder 2 on cold start but when start up sequence finishes, does not misfire. I haven't driven the car yet since it's at the shop but they said it drives fine once the start up sequence ends. Redline pulls in 3rd gear no misfire so they think it's the tune or maybe a sensor is bad.

Swapped coil packs around, new spark plug in cylinder 2, fuel pressure good, compression and leak down good, no carbon buildup on valves.

Kinda wished I didn't fill with e85 to see if it cleared things before sending to shop. Need to drain or use up the fuel before switching to stock tune to see if its the tune.

[Joon525]

Originally Posted by Butterballz

Bad news on the update. Cleaning the direct and port injectors did not fix the issue. Misfire on cylinder 2 on cold start but when start up sequence finishes, does not misfire. I haven't driven the car yet since it's at the shop but they said it drives fine once the start up sequence ends. Redline pulls in 3rd gear no misfire so they think it's the tune or maybe a sensor is bad.

Swapped coil packs around, new spark plug in cylinder 2, fuel pressure good, compression and leak down good, no carbon buildup on valves.

Kinda wished I didn't fill with e85 to see if it cleared things before sending to shop. Need to drain or use up the fuel before switching to stock tune to see if its the tune.

When you say you swapped them, are you moving the IP Quad Sparks around or do you mean you are putting the stock ones back in?

[Butterballz]

Originally Posted by Joon525

When you say you swapped them, are you moving the IP Quad Sparks around or do you mean you are putting the stock ones back in?

Swapped the cylinder 4 and cylinder 2 coilpacks. Misfire still localized to cylinder 2.

[Butterballz]

If anyone wants to look at my logs it would be greatly appreciated. Had a few look at it on Facebook, but nothing on the logs pointed out to the problem. Just a very strange misfire. Kind of coming down to a electrical issue/ignition issue. Maybe bad sensor or a break in wire somewhere.

https://datazap.me/u/butterballz/mis...?log=0&data=31
https://datazap.me/u/butterballz/mis...?log=1&data=31

One log is during cold startup, this is where I get lots of misfires and hard misfire code in cylinder 2.

Second log is driving it around after warming up, different load/rpm range, cruising to redline. No misfire except under certain repeatable scenarios. Basically giving it about 50% load around 3k rpm can make cylinder 4 misfire enough to soft code.

[Ultramaroon]

Something is wrong with #2 direct injector. As soon as it switches to 100% port injection, #2 misfire count goes to zero.


That is, as long as the correct cylinder is reported to be misfiring. ...but it's one of your direct injectors.


edit: ...or the signal/power to that injector.

[Butterballz]

Originally Posted by Ultramaroon

Something is wrong with #2 direct injector. As soon as it switches to 100% port injection, #2 misfire count goes to zero.


That is, as long as the correct cylinder is reported to be misfiring. ...but it's one of your direct injectors.


edit: ...or the signal/power to that injector.

I think it was the coilpacks. I swapped back to OEM and did not get cold start misfires, but I didn't get a chance to log. Also drove around and tried to get it to misfire by giving it 50% load at 3k rpm, which usually starts to misfire, but did not get anything. It usually misfires cylinder #4 this way.

Didn't get a chance to log during cold start after swap, but so far signs are good.

[Ultramaroon]

Originally Posted by Butterballz

I think it was the coilpacks. I swapped back to OEM and did not get cold start misfires, but I didn't get a chance to log. Also drove around and tried to get it to misfire by giving it 50% load at 3k rpm, which usually starts to misfire, but did not get anything. It usually misfires cylinder #4 this way.

Didn't get a chance to log during cold start after swap, but so far signs are good.

We'll be here when it craps out again.

[Butterballz]

Originally Posted by Ultramaroon

We'll be here when it craps out again.

https://datazap.me/u/butterballz/log...31-48-49-50-51

So far so good. No misfires on cold start.

[Ultramaroon]

Originally Posted by Butterballz

https://datazap.me/u/butterballz/log...31-48-49-50-51

So far so good. No misfires on cold start.

Looking good! I'm baffled but who cares? Send it.

[Capt Spaulding]

I dunno, maybe it's too many years dealing with 60s and 70's vintage motorcycles with weak ignition systems but misfires under load just scream SPARK in my ears. I had a couple of Honda single cam cb750s and once the plugs got a few miles on them they would develop a case of the blind staggers at anything over half throttle. I eventually reworked the ignition system from points to electronic triggers and upgraded the coils and never had another problem.

Edit: and I won't even mention Brit bikes. My Nortons were testimonials to Joe Lucas' title of "Prince of Darkness."

I had a picture that was supposedly of him on my garage wall. The caption said "Be Home Before Dark." Oops I guess did mention them. The most damaging lies we tell are those we tell ourselves.

[jeepmor]

Looks like this one is resolved and long fixed, but I found a lot of interesting info in this thread on the same topic.

https://www.ft86club.com/forums/show...cts+quad+spark

After reading through it all, especially with 13-14 models, it looks like the pins don't make robust contact and are party to the misfires.

I have a mild misfire issue comparatively and plan on the pin tweak this weekend. I've only had two misfires recently, and I get them only when pulling to 7k, and intermittently as I haven't been able to repeat at will. So I'm not swapping parts yet to see if signal follows, just seeing if I can make it go away as one user in the other thread had good luck with.

[jeepmor]

Pin tweak didn't help me, but it is simple enough if you have the proper pliers. I left mine turned about to the point it's just noticeable. Regular needle nose are too large to fit in the connector housing. Oddly, got a CEL at the same 7k conditions, but it didn't record the code as I showed none when I checked with my reader. I even checked twice.