FJRiders.com

Well, here we go again. KrZy8 throwing a hissy fit.

Running rough / stalling off idle. 32-35 mpg not high 30's low 40's as baseline. Unfortunately, KrZy8 sat for too long while I was away working.. ~ 3 months total.

Troubleshooting Plan

Check Compression
​COLD 1=190 2=190 3=175 4=175 7.9% delta. Note.. I used a throttle lock.. and think it slipped at #3, 4 reading, closing the butterflys somewhat. Will test later.

Check Air Filter for mice nest
​Clean. Air filter kinda dirty but not excessively bad. Replaced.

Check/Replace injectors
​Had 4 refurbished RC Engineering from 2017 sitting in the spares box. Tested each using 9 vDc battery. 3 of 4 not clicking. Used a home made test fixture to supply gasoline under slight pressure to injector, whacked them with screw driver, and each then clicked and sprayed like a male cat.

Replace fuel in tank with fresh
​Thinking some condensation might have formed.. and I use SeaFoam, which FortNine recently demonstated is not the best storage solution.

On the lift, KrZy8 is crisp, GREAT. Fast throttle response.. Snappy!

So that's it for now. Now let's go ride..

---------
Good news, bad news

Good news - Ran great for first 50 miles or so.. Snappy, high 30's mpg, STRONG

Bad news - Instantly... KaBoom, dropped a cylinder or so it seems. Exhaust rough, has the hollow sound of a cylinder not firing. WTFO? Decided to take 'main' roads home for easier tow truck access should it come to that.

MPG's now in low 30's high 20's.

Idles fine. But under load, missing, and very noticeably.

Then, MAGIC and instantly, running purrfect and MPG's climb to mid 40's. Oh Happy Day.

Then, BAM, and back to crapola.

What can it be?

Sticky fuel injector?
Water blob in tank, sloshing around, getting picked up once in awhile when cornering or whatever?
Ignition coils? (Idle is fine, throttle under no load fine, but under load missing... higher compression blowing spark out?) BTW, coils, leads, caps replaced with used eBay units 2019-08-10.
Spark plug going south?
Fuel pp failing (I can put the 2013 tank of the 2006 to test!)

Unfortunately, no auto store in Paso Robles or Atascadero has qty 4 CR8EIX NGK plugs.. Decide to soilder on to Paso, pick up 3 NGK's then to Atascadero for some fancy smancy E3 plug.. just for testing.

Current plan

Replace sparking plugs
Check battery connections + ground (even though starting and charging is working fine)
Pull and test FI's on bench with 9vdc battery and test rig
Re-run compression check when warm and known TB's fully open

Truly dissapointing but so it goes.

HOPEFULLY I'll find something really stupid I did.. like not fully connecting a FI connector or likewise..

Turkey day tomorrow.. but maybe I can get to the shop and play. KrZy8 already on the lift.

SO WHAT DO YOU FART SMELLERS SUGGEST?

Hey Slackers... It's been 10 minutes and no response? Really? LOL.

I got your response right here buddy...

Fuel or spark, hard to tell from 1000+ miles away!

~G

Might take a look at the ignition coils and plug wires. Also wiring to the coils, bad connection maybe?

Throttle Position Sensor?

Operator error?

J/K Don, hope you can get back to the good bam!

whacked them with screw driver, and each then clicked and sprayed like a male cat.

Verify the wire connections to the plug boots. Easy to cause and will result in the symptoms you are getting. Seems that this is a reoccurring issue with your bikes.

Snug up the big loose nut behind the handlebars.
Do what Ionbeam says.... I'll go a step further, test resistance of spark plug boots. I'm told the resistors don't go bad but the spring in there gets a tad corroded... clean 'em up while yer in there, retest resistance.
I don't think so by the sound of symptoms, but check vac hose and MAP sensor nipple are clean.
I don't think TPS is bad, you'd have different symptoms.
Injectors likely OK, keep running Seafoam..... FortNine can stuff it, he didn't prove anything scientifically.

Were not you recently visited by an itinerant motorcycle delivery guy? Sabotage?

I'll bet if he gives the KZ1300 a Viking funeral a lot of his issues will be history

fjray wrote: ↑Thu Nov 26, 2020 11:19 am I'll bet if he gives the KZ1300 a Viking funeral a lot of his issues will be history

KZ1300 is an asymptomatic carrier of homotrons surreptitiously infecting the rest of the herd. JSNS

Thanks for help everyone.

Checked Error Codes... 1 instance of #12 "No normal signals received from the crankshaft position sensor."

Cleared it, started and ran several times, no re-occurrence, don't think this is the issue..  as symptoms remain and w/o CS position signal, no run.. would be my guess.

Sparking plugs fuel air color mixture look purrrfect.

Compression warm, TB's wide open
1 210
2 195
3 190
4 195

SparkplugCapOlogy

All connections wire to boot tight.

Resistance across resistor kOhms
1 - 10.66
2 - 9.58
3 - 9.23
4 - 10.11

Resistance value *through boot* e.g. resistor installed
1 - 10.66
2 - 9.62
3 - N/A forgot to measure
4 - 10.11

Cleaned all resistors/ brass conductors

Trimmed plug wire back 1 mm, reinstall caps All wires looked clean, no corrosion, and As Found condition was tight.

Checked coil performance by sparking plugs via diagnostic mode. 1 & 4 Sat, 2 &3 Sat. Used old plugs for test, new plugs already installed.

Put tank back on and fired her up.

Running r o u g h.  Much worse. 

Might this be a fueling issue? Had siphoned off the tank to 1 bar indicated on fuel gauge, removed, then reinstalled for this test. Might there be debris or water at tank bottom causing issues? She ran much better before this latest evolution of checking wires and caps, resistors.

BTW, same 'hollow' sound. 

Thinks that make you go hmmmm.

OK. My bad. Gas tank too empty for test fire described above.

Tried to drain all fuel from main tank using aux tank feed bung.. and nothing come out. Hmm.
Turn tank upside down, try to 'slosh' gas to RHS where aux bung is and still no fuel coming out.

Can hear *some* fuel in that however..

Anyway, fired up and she's back to purring.

Of course, she was purring like a big kitten right before instantly having a miss so who knows.

Me thinks I'll get to coil location anyway and look things over later.

Edit. Ran rpm up slowly to 7k, lots of sputtering and popping along the way. ~6.5k rpm large rpm fluctuations. Upon return to idle, idle is very low, ~700-800 where I normally have it 1.5k (I like high idles in my engines).

Hmmmmm.

OK good. Code 12 usually fake.... but did you happen to have right timing cover off and pinch the wire between cover and crankcase... quick run your hand up the wire and see if free from that.... it will run like crap if pinched, and can do so intermittently. Usually gets pinched near the top of the timing cover. Wire goes up and in under the TB's, should be OK under there.
Sputtering and popping, well I would put in some Seafoam anyway, but.... now sounding like running lean. Ensure sufficient fuel level in case fuel pump occasionally sucking air. Takes a fair bit of fuel if you have the tank up.... lay it down, see if better.
Good on all the other stuff. Compression is just fine.

Pics don't post direct from my web site but here's pics of work done today.

https://candybuttorg.ipage.com/cba/node/939#comment-850