Slight misfire at Idle

[rcsnclh]

Started the bike the other morning and I noticed a miss at idle (and up to about 2500 rpm in nuetral) that has not been there before. Intermittant, but very noticeable. Bike also seems to have very low power till it reaches about 2k rpm and then the power comes on and it wants to jump out from under me. To be honest, the low rpm power loss has been present since I had the Tick repair done, but the miss is new.

I'm ashamed to say that after the tick repair was done, I didn't ride the bike for several (OK about 5) months. Didn't have the greatest luck with the dealer who did the tick repair so didn't want to go back to them.

Had my local (very well respected) dealer do everything from the TPS warranty repair to a complete diagnosis including indivdual cylinder exhaust gas analysis, new plugs, etc. and it still isn't right. It's rideable, but not right.

Ideas?

 

[ionbeam]

Check your spark plugs, but more importantly, check that the plug wires are properly inserted in the boots and that the boots are COMPLETELY down on the spark plugs. This is a known item to cause your symptoms.

 

[Ramblin Man]

Also check to make sure the vacuum caps on the throttle bodies are on and intact.

You may also want to take it back and complain. There should have been no power loss.

 

[GAPS]

Adding my name to this list, my 06A has developed a very noticeable stumble just off idle, with throttle just barely cracked off idle...it seems most noticeable when cold but is there when the motor is warmed up too. I have a PCIII with combined Wally map loaded which ran great for aprox 1000 miles before this symptom showed up so I dont think it is that. Just changed the plugs and did a TBS to see if that would fix it but no luck....thinking about taking the PC111 offline to see if it goes away. I did the dry gas/injector cleaner thing too....do these throttle bodies have MAF sensors that need cleaning from time to time??

Looking for the guru touch on this one, help!

 

[SkooterG]

What is a 'just off idle stumble'? I am not sure what you are talking about.

As for the original poster, all FJRs have 'very low power' below 2k rpm. I am not convinced there is any significant problem there.

 

[Geezer]

As stated above, check the vacuum caps, plug wires, and maybe pull the plugs and see if they are clean.

Also, after a five month layover you should fill the tank with fresh fuel.

 

[GAPS]

Skooter....I'm talking about 2% throttle opening beyond idle, throttle just opened a wee bit. the amount you might use for a nice gentle roll out of the driveway in the morning....beyond that it runs like it should, nice and strong.

Geezer, just did a TBS, caps are in place. Has new plugs. Bike never sat this winter, gas is good. Low mileage bike, only 9k miles, I hope the wires are still good... I'm thinking about taking the PC111 out of the picture to see if that is Fd up somehow....

thank you gents for the response, buffudled over here...

 

[SkooterG]

How is it 'stumbling'? What happens?

 

[radman]

How is it 'stumbling'? What happens?

It stumbles just off idle. Think back to 2 am or so, Reno.

 

[GAPS]

How is it 'stumbling'? What happens?

she stumbles like a hung over bimbo with two left feet, then she clears her throat its all fun and games.

 

[RadioHowie]

Pilot jets clogged with squirrel feces.

 

[Bustanut joker]

Pilot jets clogged with squirrel feces.

Umm does it look like this?

:jester:

 

[GalaxyBlue]

My vote is TPS or a dead spot on a PCIII map. Cant say which, Because they were done the same time

I had this exact problem with mine, And i replaced the TPS under warranty and got a custom map done for my Muzzys. All is better now

 

[ionbeam]

...I noticed a miss at idle...that has not been there before...seems to have very low power till it reaches about 2k rpm...To be honest, the [SIZE=14pt]low rpm power loss has been present since I had the Tick repair done[/SIZE], but the miss is new...dealer do everything from the TPS...complete diagnosis including indivdual cylinder exhaust gas analysis, new plugs, etc. and it still isn't right...

To rule out a fundamental problem that may have come along from the Tick fix, you may want to consider a compression check and a cylinder leak down test. Leaking stem seal(s) can cause power loss and low rpm missing. This will also tell you if you have sticking rings, which turns out to be not so uncommon. Hey, nothing else has helped, this will at least tell you that your engine is mechanically sound, therefore the problem has to be with the fuel or ignition system.

 

[C&C]

Just throwing this out because it happened to me. Since my bike was an '04 and had numerous TPS's done, the caps had been removed and installed multiple times. It is hot in there and the rubber had developed small cracks that you couldn't see unless you looked real hard.

When past idle, a small vacuum leak doesn't really manifest any problems, but at just off idle, I developed a slight bog. I changed the caps and had some relief.

Not saying this is you problem but something to check maybe.

 

[GAPS]

Very good, I'll look for squirrel feces in my pilot jets first.....you get that gerbil out of your exhaust yet??

Is there a test I can do on the TPS or is this a replacement a prayer kind or job? I am going in with the PC111 map too, going to set it back to the base map just for kicks or perhaps take it offline to just rule it out...and I'll recheck the caps too, could be cracked i suppose...

Thanks for the help gents, this is making it almost fun.

 

[XJRGUY]

Started the bike the other morning and I noticed a miss at idle (and up to about 2500 rpm in nuetral) that has not been there before. Intermittant, but very noticeable. Bike also seems to have very low power till it reaches about 2k rpm and then the power comes on and it wants to jump out from under me. To be honest, the low rpm power loss has been present since I had the Tick repair done, but the miss is new.
I'm ashamed to say that after the tick repair was done, I didn't ride the bike for several (OK about 5) months. Didn't have the greatest luck with the dealer who did the tick repair so didn't want to go back to them.

Had my local (very well respected) dealer do everything from the TPS warranty repair to a complete diagnosis including indivdual cylinder exhaust gas analysis, new plugs, etc. and it still isn't right. It's rideable, but not right.

Ideas?

Bad tank of gas maybe?

Clogged injector(s)?

 

[GAPS]

:yahoo: Turns out my PC111 was giving me trouble, I removed the unit and went for a little test ride... :yahoo: and all is well again. No more stumble or misfire off idle, just nice smooth power. I tried a couple maps and reset the zero position for kicks and no luck, no matter which map I loaded the bike was having the same ****** throttle response down at low rpm under light loads so out it goes... I will just go without at this point, bike felt great on the test run, it felt stronger than with the PC111 before it started to act up and that is NICE!!

Of note, this PC111 failed suddenly though the symptom was not unrideable. Whatever went wrong with the unit, it happened mid-ride, I was about 200 miles into a 350 mile day when it happened. My first thought was I had filled up with some bad gas with the sputtering and all. It even stalled out once after a highway run at the end of the exit ramp, something that had never happened before on this bike....anyway, I'm good to go now, very happy...... I wonder if Dynojet will back up the unit???? It is only 2 years old.