For a few weeks now, I noticed that my PCX is slightly sluggish, especially in acceleration. It sometime feels like a flooded carburetor.
first thing I did is check and clean the air filter, spark plug and the variator drive parts. Everything looks okay.
Yesterday visited my mechanic for his opinion. I was thinking it to be a valve clearance problem since I haven't got the valves checked in 30,000 kms.
He used an API Doctor diagnostic tool to diagnose my Pcx and instantly found the problem; it is the TPS (Throttle position sensor) malfunctioning and not giving accurate throttle position during acceleration. He said this is a common problem of PCX. Might as well give you guys a heads up. Quite a useful tool I think.
Unfortunately, he is quite busy with other repair jobs that I will need to wait until next week before he can replace the TPS and clean the fuel injection. He will also check the valve clearance. Im still using the scoot, it still runs okay, except for the sluggish acceleration and occasional flooded/choked feeling..
alx123 wrote:For a few weeks now, I noticed that my PCX is slightly sluggish, especially in acceleration. It sometime feels like a flooded carburetor.
first thing I did is check and clean the air filter, spark plug and the variator drive parts. Everything looks okay.
Yesterday visited my mechanic for his opinion. I was thinking it to be a valve clearance problem since I haven't got the valves checked in 30,000 kms.
He used an API Doctor diagnostic tool to diagnose my Pcx and instantly found the problem; it is the TPS (Throttle position sensor) malfunctioning and not giving accurate throttle position during acceleration. He said this is a common problem of PCX. Might as well give you guys a heads up. Quite a useful tool I think.
Unfortunately, he is quite busy with other repair jobs that I will need to wait until next week before he can replace the TPS and clean the fuel injection. He will also check the valve clearance. Im still using the scoot, it still runs okay, except for the sluggish acceleration and occasional flooded/choked feeling..
alx123 wrote:For a few weeks now, I noticed that my PCX is slightly sluggish, especially in acceleration. It sometime feels like a flooded carburetor.
first thing I did is check and clean the air filter, spark plug and the variator drive parts. Everything looks okay.
Yesterday visited my mechanic for his opinion. I was thinking it to be a valve clearance problem since I haven't got the valves checked in 30,000 kms.
He used an API Doctor diagnostic tool to diagnose my Pcx and instantly found the problem; it is the TPS (Throttle position sensor) malfunctioning and not giving accurate throttle position during acceleration. He said this is a common problem of PCX. Might as well give you guys a heads up. Quite a useful tool I think.
Unfortunately, he is quite busy with other repair jobs that I will need to wait until next week before he can replace the TPS and clean the fuel injection. He will also check the valve clearance. Im still using the scoot, it still runs okay, except for the sluggish acceleration and occasional flooded/choked feeling..
my mechanic got more than 10 of those faulty TPS he pulled out from other PCX..
i'll be posting updates here as soon as the repair is done..
Re: TPS problem
Posted: Fri Nov 02, 2018 9:11 am
by you you
alx123 wrote:
you you wrote:
alx123 wrote:For a few weeks now, I noticed that my PCX is slightly sluggish, especially in acceleration. It sometime feels like a flooded carburetor.
first thing I did is check and clean the air filter, spark plug and the variator drive parts. Everything looks okay.
Yesterday visited my mechanic for his opinion. I was thinking it to be a valve clearance problem since I haven't got the valves checked in 30,000 kms.
He used an API Doctor diagnostic tool to diagnose my Pcx and instantly found the problem; it is the TPS (Throttle position sensor) malfunctioning and not giving accurate throttle position during acceleration. He said this is a common problem of PCX. Might as well give you guys a heads up. Quite a useful tool I think.
Unfortunately, he is quite busy with other repair jobs that I will need to wait until next week before he can replace the TPS and clean the fuel injection. He will also check the valve clearance. Im still using the scoot, it still runs okay, except for the sluggish acceleration and occasional flooded/choked feeling..
my mechanic got more than 10 of those faulty TPS he pulled out from other PCX..
i'll be posting updates here as soon as the repair is done..
Wow.
What does that say?
Re: TPS problem
Posted: Fri Nov 02, 2018 12:32 pm
by fish
I had a failed TPS on my Kymco LIKE200i - took mos. to get it sorted because dealer did not have the Kymco diagnostic plug-in tool. And of course would not listen to my instructions on how to make it appear.
I had it 'seat-of-pants' diagnosed after reading of a motorcycle with my scoot's symptoms (heavy, heavy, banging stumble at one specific cruising speed) Idle, full throttle, etc - were perfect otherwise.
Kymco forum member sent me his Kymco tool - I made a video, posted it on youtube for the service rep. of KymcoUSA to view. He contacted my dealer again and lit a fire. In short order I had a new throttle body installed free under warranty.
Three more failed TPS from the same model year (2012) have come to light on the Kymco forum - which equals a pretty small % of failures.
TPS is not sold separately - so have to purchase full throttle body at $230.
Fish
Re: TPS problem
Posted: Fri Nov 02, 2018 12:51 pm
by Old Grinner
Yeah. . .we'd all like to hear about the "TPS" reports. . ..
Sorry. . .couldn't help myself.
Seriously though good luck with that maintenance update!
Re: TPS problem
Posted: Fri Nov 02, 2018 5:27 pm
by you you
Old Grinner wrote:Yeah. . .we'd all like to hear about the "TPS" reports. . ..
Sorry. . .couldn't help myself.
Seriously though good luck with that maintenance update!
Re: TPS problem
Posted: Fri Nov 02, 2018 10:33 pm
by alx123
Scoot is okay if you slowly twist the throttle, so no problem with cruising speed or even full throttle as long as you slowly get there. The problem is evident once you forced it to go fast instantly, so racing a quarter-mile should be a no-no for now.
Re: TPS problem
Posted: Sat Nov 03, 2018 3:00 am
by you you
alx123 wrote:Scoot is okay if you slowly twist the throttle, so no problem with cruising speed or even full throttle as long as you slowly get there. The problem is evident once you forced it to go fast instantly, so racing a quarter-mile should be a no-no for now.
Would I’t be worthwhile quickly wizzing it out and cleaning?
Re: TPS problem
Posted: Mon Dec 03, 2018 12:01 am
by alx123
Late update
Done changing the TPS, and it solved the problem immediately.
rsz_47215553_2232777156755205_3771693065048162304_o.jpg (32.11 KiB) Viewed 8793 times
rsz_47453969_2232777243421863_7195660123203698688_o.jpg (43.39 KiB) Viewed 8793 times
photos of the TPS
rsz_47323989_2232777336755187_1721170283735285760_o.jpg (41.64 KiB) Viewed 8793 times
cost: $45 for new TPS including labor
Re: TPS problem
Posted: Mon Dec 03, 2018 1:56 am
by you you
Excellent
Re: TPS problem
Posted: Tue Dec 04, 2018 11:56 am
by WhiteNoise
Wow is right! TPS
Always amazes me that something like this, inexpensive, small, made of plastic can cause this problem.
Glad they pinpointed it right away, that's a blessing in itself! Part was cheap, installed and off you go (as if it never happened).
Cheers Alx and I thank you for the info and pics of this unbeknownst part (to me anyway).
Simpler probs and solves: (yeah us! We've been there done that/this!):
Hmm, Bike won't start. On/off (Kill) switch in off position? Or need lubing? Side stand down? Pull left brake handle?
Bike feel sloppy? Need air in tires?
Smoking'? Check oil? Other fluid? Leak? Leave rubber lately?
Ya say the battery is 8 years old? Uhh..Need one? Lights out? Check bulbs, fuses, wires?
Smell Gas? Whoops! We won't go there!
Re: TPS problem
Posted: Wed Dec 05, 2018 10:45 am
by alx123
That Diagnostic tool really made all the difference, the problem with the fuel injection was identified almost instantly. I hope most Honda dealers have them too.
Re: TPS problem
Posted: Fri Jul 01, 2022 6:57 am
by pintail120
is a TPS sensor just not a glorified potentiometer?
could we not take it apart and put some switch cleaner in it and off we go again ?
(to me anyway).
We won't go there!