2015 PCX 150 sounds like a Rod Knock

[MichaelGee]

Brother just mentioned, check this out,
”someone throw a marble or a rock in the exhaust pipe screwing with you?“, I DOO have a petty neighbor that starts drama when he’s bored come to think of it.. Real bromance kind of guy, wife hates him and everyone is always trying to beat him up..

Brother proceeds-
as exhaust pressure is reduced for even cruising it starts rattling, and wouldn’t rattle accelerating because of pressure, and wouldn’t rattle decelerating because of no pressure. Maybe it’s stuck in just the right spot

My question, would you hear it by transfer on the Left side at variator?

Just removed variator again, put tighter Dr Pulley slides on the ramp plate..

Holding only the sides and boss, i shook the hell out of it and can not hear rattling, so that’s not it.. Besides, belt applies pressure against movable face which in turn applies pressure to rollers to ramp plate, so that can’t rattle when loaded up at speed

Still rattling down the road

[MichaelGee]

Nothing in exhaust..
Hammered with a 2 pounder all over and nothing

Afraid to ride this thing over 15mph
Don’t want to be the cause of more internal damage

[MichaelGee]

Can’t handle it
posted for sale $2200 or best

It has good headlights

So sad this Honda rattles..
Never heard a Honda rattle..

And I’ve been wanting one of these since they came out in 2015, well i got a good week of enjoying it.. Should’ve never changed the oil..

What a waste
13 hrs driving to pick it up
Days and Parts and Panels rebuilding ignition, and Everything else..

Only thing wrong now... the rattling..
That is it..

[you you]

Can’t handle it
posted for sale $2200 or best

It has good headlights

So sad this Honda rattles..
Never heard a Honda rattle..

And I’ve been wanting one of these since they came out in 2015, well i got a good week of enjoying it.. Should’ve never changed the oil..

What a waste
13 hrs driving to pick it up
Days and Parts and Panels rebuilding ignition, and Everything else..

Only thing wrong now... the rattling..
That is it..

I think it’s for the best.

[MichaelGee]

All the right questions, and answers, are Posted right in this chain..
The answer is in the questions..

Many can experience the Same issue..

Have a guy on Stand-by Ready to purchase at 2200 straightforward knowing everything, he’s waiting for me to give up in frustration.. My problem is the “Anxious” disorder inherent with everything i do.. Everything is too Fast in my head at personal level.. wife hates talking to me because I’m done with the current conversation and calculating the next in my head..

Being a research freak as r&d advisory engineer, just have to step back and Look.. What is cause and effect of the questions and answers i posted?
So I goto work for the PCX..

1) added injector cleaner, air filter, at oil change
2) variator acts like a speaker, cleaned out air vent
3) new spark plug is burnt
4) it slowly came on over 1-3 days, 50, 30, then 15mph

Because i do many things at a time with my Anxious problem, coincidental observations have occurred, leading to wrong diagnostics of issue..

What rapidly burns up a plug?
Why does it only make the sound at cruising speeds?
I asked of spark ping, although much deeper tone than that, like a rod knock..
And the Variator acts like a speaker

Combustion knock is the answer
Compression level has exceeded the limits of engine management
Carbon buildup from additives in injector cleaner..

I will be pulling the old plug I put back in, and borescope the piston..
Already know the answer I will see, I will seafoam spray the intake while revving to keep running, then dump heavy to stall it out, let it soak for a few hours to clean the trash out..

See page 10-5
Excessive carbon buildup

[WhiteNoise]

Whoa....Michael, I admire your determination whether brought on by anxiety (or whatever).
Now Hear This --> clapping hands!!
Still tailgating this thread. Continue on please....

[Gil]

Keep at it. When I'm stuck on a problem I step away from the problem for a while to let the problem simmer in my mind. That way when I return to fix the problem I have a clean slate and might approach the problem in a different way. Good luck, you got this.

[springer1]

Super Clean fresh fuel is in..
Let it idle for 5min, then shut it off for about 15min

Fired it up and went for a 10mph ride for a mile or so around our sub, this thing really Sips the gas so, i know it’s going to take a bit for Real fuel to be flowing solid. Punched it a couple of times to push fuel in, but short streets right to deceleration.. didn’t give it a chance to even speed rattle, pulled in and shut it down.

A thought ... did you or did you not verify it still knocks after replacing with fresh fuel & no additives? Additives displace fuel which leans out the mix. So if you were lean before due to too much additives, maybe that was the knock cause. ( and plug condition )

[MichaelGee]

Yes springer1 Excellent point of view -Lean Condition-
After each and every action I test, still persists..
Lean condition will Definitely cause spark knock

May have trashed my injector “?”
—adding Lucas fuel injector cleaner at oil change
—and then octane booster after knocking started

Quick note to everyone: since purchase & before knocking
The last 25% of throttle is actually Weaker while accelerating
can’t full throttle this thing, slows acceleration if I do..
Throttle linkage free play is within spec
What would cause this?
—Advanced spark timing would
—Advanced valve timing would, and enhance exhaust carbon

What that i have done, would cause a lean condition?
—original air filter was plugged up, new one at oil change
—new gas cap, it didn’t have one when i got it

Going to plug half of air cleaner and remove gas cap for another test

Then i am Going to purchase a laptop link connector, and find Honda software

(i read my postings from a different pair of shoes)

[Old Grinner]

A few added notes . . ..

Check to see that your "coolant level" is as required and seems OK.

If you are finding it's taking longer to get to higher speed or not getting to where it should be it's possible your piston rings are worn. An engine with worn piston rings can start OK and initially seem to run OK but once things get up to "temperature" the loss of compression effects the performance.

Is the "Throttle Position Sensor" OK? That will effect acceleration characteristics.

Is the "Fuel Pump" OK?

Since you poured in fuel additives etc . . . the fuel pump would cycle that stuff through the system. Things seemed OK at first right? Then you added stuff to the fuel system . . . then the problems began.

A faulty fuel pump can also cause engine knock due to poor or uneven mixtures of air and fuel reaching the combustion chamber.

Good luck and may the Force be with you.

[iceman]

Must be some crap unregulated fuel in the US - as even the cheapest 95 Ron fuel here in the UK works perfectly and has to meet stringent standards. Asda (re Walmart) for many years stocked 97 ron fuel but recently with EU changes that is now 95 Ron rated, but is still the specified fuel for PCX's and works perectly - no issues, I have tried other more costly pertrol station fuels but did not notice much difference if any.

My '14 reg PCX runs perfectly with it, getting well over 130 UK mpg, 23,000 miles and still no valve checks or dealer service.

[you you]

Pure gold, thread of the year so far

[MichaelGee]

Where’s the “Like” button?
Some of these posts Definitely needs a liken

[MichaelGee]

Well, Honda called me..
Jist of conversation, “never heard That before, sell it”
Got to be Fn kidding me..

I typed up a speil on this and saved it, battery was dying..
Wait for it, next post;

[MichaelGee]

This thing is Clean inside.. and the even keel (over 15mph) rattle persists..

So Lapeer Honda finally calls me back, quick briefing..
His response “well I’ve never heard this one before”

I also state it sounds and acts, like a spark knock, as also specified in manual 10-5, he hesitantly agreed it sounds that way, then proceeded to tell me “it’s not that” to my questions..

I told him I don’t think it’s cam chain tensioner, wrong sound it’ll be clicky he says with a tang slap of chain..

So I ask him, since i am halfway to checking valves, think I should go ahead and set those anyway? He says no it’s not the valves because you’d hear those all the time not just at even speeds so don’t waste yer time, you can try and quiet it down with slick50 or such and sell it off, because this will be exploratory labor at $70 an hour, and we are easily at 3weeks out before even touching your bike.. oh okay well thank you for your time...

So here we go my mind is in OCD overdrive
Why would he not want me to check valves since I’m so close to them?
I would be able to see if the Cam mark is off from alignment mark in relation to the Crank TDC mark, and That’s important info.. Probably looking for Corona shutdown service cash

IF my cam chain jumped a tooth because of a weak tensioner setting
THEN exhaust could/may be present during combustion, which overheats causing spark knock, or a too far advanced spark to valve timing..

Yes No “?”
Anyone?

Maybe I Was on the right track with carbon spark knock
The direction i was going, exhaust carbon heating up combustion chamber

Really don’t want to give up, it’s a nice comfortable ride..
But I don’t want to get to a point I can’t back out of..
replacing cam chain, slides and setting tensioner at 3lbs..
If i have to do that, might as well do a new crank rods piston bearings and rings Sheesh

I’m a pencil pusher geek
Blue prints, schematics, design group advisory engineer, computer it tech.. what the hell..

[springer1]

IF my cam chain jumped a tooth because of a weak tensioner setting
THEN exhaust could/may be present during combustion, which overheats causing spark knock, or a too far advanced spark to valve timing..

Yes No “?”
Anyone?

I'd say no. Wouldn't skip a tooth, at least I've never heard of a loose tensioner resulting in that much slack. Simply would get sloppy and accelerate gear/chain wear & be noisy.

[MichaelGee]

In response to loss of power: Nope full acceleration power
But for shits n giggles, going to test the injector, spray pattern in a bottle
after i do the valves and check cam alignment today

[MichaelGee]

Anyone ever hear of
Petron Plus

Considering 20-30% of that in my oil

[MichaelGee]

it all Sounds and Acts like a spark knock

[mymitzi]

Disregard if already done. [Compression check]?