Stuck Throttle and Other Things

4456 Views 13 Replies 8 Participants Last post by Dirt, Mar 23, 2010

Dirt

Discussion Starter · Apr 20, 2009

OK, I'm a little worried now. Here's a little history.

I've got an '08 with about 400 miles on it and I've had engine problems where the engine will cut out intermittently. It's been documented at the dealer that I've had the problem, but they haven't observed it themselves. It's almost like a clogged fuel filter but it's more defined than that. A plugged fuel filter makes the engine go lean and sputter. This is very simliar but each stutter is as if the engine goes completely off, or dead.

I've got a Bazazz Z-Bomb and a PCIII installed. Both were installed after the initial engine problems, so I don't think they're related.

The engine cut outs have gotten marginally more frequent lately. I've experienced it three or four times in the past 150 miles.

Tonight I experienced something completely different. I had just done my first ever full throttle blast through 2nd and 3rd gear onto the highway. I coasted down and settled at 75 mph for a mile or so, then took the next exit where I discovered the throttle was stuck. I pulled in the clutch and pulled over and the engine idle settled at a little over 6,000 rpm. Turned the engine off, started again and still the high idle. I decided to head back home as it was manageable with care, and as soon as I shifted into 2nd gear the idle dropped back to normal.

I've decided not to ride it again except to the dealer until something gets sorted out. My question for you is this: Is there anything electronic or electronically controlled that can cause a 6,000 rpm idle such as emissions equipment, exhaust gas recirculation, etc? If so, could any of it be affected by the Z-Bomb or PCIII? Could a faulty TPS cause all of the above?

My dealer is well known to me and isn't immediately put off by the fact that these are installed since we documented the cut-outs prior to their installation. The high idle is another animal entirely, though. If it's not a mechanical issue (crimped throttle cable, stuck butterfly, etc) then I'm really leaning to taking these things off prior to landing the bike at the dealer. I guess I'm also trying to figure out if these two things can be related. The idle issue could potentially be something mechanical that got worked loose because I'd gone completely full throttle for the very first time.

Any input is welcome. Thanks.

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CBRworm

· #2 · Apr 20, 2009

Have you had the air filter out? It is possible that something fell in and lodged in place keeping the butterflys open a hair.

I don't know if the idle air control can bypass enough air to bring the idle up that high and I don't know if the bazaaz has any control over the IAC valve.

Normally I would say that something electronic would not have the ability to add the air required to bring the idle speed up that high, but with the electronic idle air control, all bets are off.

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Dirt

Discussion Starter · #3 · Apr 21, 2009

The bike ran fine for three weeks with the PCIII and Z-Bomb, so I doubt it was anything left over in the air box. Besides, I'd have expected an almighty clatter if something big enough to get stuck in the throttle butterflies came loose and went through the engine. No such thing happened.

I pulled all the stuff off tonight and I'm dropping it at the dealer tomorrow.

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djhartm

· #4 · Apr 21, 2009

The throttle stuck several times on my first 08, but it seemed entirely random. It was a very disconcerting and dangerous feeling, but I always managed to pull the clutch in at corner entry.

I would have the dealer diagnose.

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Dirt

Discussion Starter · #5 · Apr 21, 2009

On the positive side it's not burning a drop of oil...

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Dirt

Discussion Starter · #6 · Apr 26, 2009

So the dealer had the bike for two days, got the thing to misfire and found nothing worse than a loose battery cable. A cable that I, unfortunately, left loose myself the day before when I took off the Z-Bomb and PCIII. The bike ran fine the day I picked it up. I rode it today for 45 minutes and it misfired for half the ride. Needless to say this is getting annoying. I looked up Missouri's Lemon Law and frustratingly it doesn't apply to motorcycles. I plan on e-mailing the service department of the dealer every time the bike misfires from now on. For good measure I think I'll keep a complete mileage log, logging the miles I ride every day and when it misfires.

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Dirt

Discussion Starter · #7 · Jul 7, 2009

Problem solved (fingers crossed).

I had to leave town for work for six weeks so I dropped the bike with the dealer before I left. The service manager (a friend of mine) put the diagnostic tool on and used the bike as his daily driver until he could replicate the problem. The fault code was for a bad cam position sensor. He's run two tanks of fuel through after replacing the sensor and I've run nearly one through and so far the misfire hasn't reappeared. Here's hoping it stays that way.

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jpracing39

· #8 · Jul 7, 2009

...ahhh the cam position sensor! I had the exact same intermittent misfire on a SP2 (RC-51) I raced in Australia. Discovered a cracked CPS connector on the rear cylinder. Problem solved.

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cjayw

· #9 · Jul 18, 2009

Stutter

I have the same stutter. Picked the bike up 2 days ago and had it back today. Chief mech took it for a ride and of course it did nothing.

Thanks for the info. :th_salute:

Dirt said:
OK, I'm a little worried now. Here's a little history.

I've got an '08 with about 400 miles on it and I've had engine problems where the engine will cut out intermittently. It's been documented at the dealer that I've had the problem, but they haven't observed it themselves. It's almost like a clogged fuel filter but it's more defined than that. A plugged fuel filter makes the engine go lean and sputter. This is very simliar but each stutter is as if the engine goes completely off, or dead.

I've got a Bazazz Z-Bomb and a PCIII installed. Both were installed after the initial engine problems, so I don't think they're related.

The engine cut outs have gotten marginally more frequent lately. I've experienced it three or four times in the past 150 miles.

Tonight I experienced something completely different. I had just done my first ever full throttle blast through 2nd and 3rd gear onto the highway. I coasted down and settled at 75 mph for a mile or so, then took the next exit where I discovered the throttle was stuck. I pulled in the clutch and pulled over and the engine idle settled at a little over 6,000 rpm. Turned the engine off, started again and still the high idle. I decided to head back home as it was manageable with care, and as soon as I shifted into 2nd gear the idle dropped back to normal.

I've decided not to ride it again except to the dealer until something gets sorted out. My question for you is this: Is there anything electronic or electronically controlled that can cause a 6,000 rpm idle such as emissions equipment, exhaust gas recirculation, etc? If so, could any of it be affected by the Z-Bomb or PCIII? Could a faulty TPS cause all of the above?

My dealer is well known to me and isn't immediately put off by the fact that these are installed since we documented the cut-outs prior to their installation. The high idle is another animal entirely, though. If it's not a mechanical issue (crimped throttle cable, stuck butterfly, etc) then I'm really leaning to taking these things off prior to landing the bike at the dealer. I guess I'm also trying to figure out if these two things can be related. The idle issue could potentially be something mechanical that got worked loose because I'd gone completely full throttle for the very first time.

Any input is welcome. Thanks.

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i bleed blue

· #10 · Mar 18, 2010

i know this is a old post but did the cam sensor cause the high ilde or was that something else mine idles at 52k rpm and dealer has no idea what is causing it

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TedEbear

· #11 · Mar 18, 2010

i bleed blue said:
mine idles at 52k rpm and dealer has no idea what is causing it

:OMG::OMG::OMG: Holy moly! Considering the redline on these things is 13k rpm I'd say you have a rather high idle there...

Or did you mean 5.2k rpm?

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i bleed blue

· #12 · Mar 18, 2010

TedEbear said:
:OMG::OMG::OMG: Holy moly! Considering the redline on these things is 13k rpm I'd say you have a rather high idle there...

Or did you mean 5.2k rpm?

5.2k rpm good lookin out

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tcoxsatx

· #13 · Mar 18, 2010

Dirt said:
Problem solved (fingers crossed).

I had to leave town for work for six weeks so I dropped the bike with the dealer before I left. The service manager (a friend of mine) put the diagnostic tool on and used the bike as his daily driver until he could replicate the problem. The fault code was for a bad cam position sensor. He's run two tanks of fuel through after replacing the sensor and I've run nearly one through and so far the misfire hasn't reappeared. Here's hoping it stays that way.

you never mentioned in your post about it throwing a code ,did that just start the last time or after the battery cable was tightened up? you can run a self exam on the bike using the red plug under the seat with a jumper wire:th_salute:

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Dirt

Discussion Starter · #14 · Mar 23, 2010

Quite a while on and there've still not been any problems. The misfire is gone.

tcoxsatx, I never did a self-diagnosis. The dealer got it to throw a code for the cam sensor. It just took riding it for several days before the misfire, and code, appeared. I have no idea what you're talking about regarding the jumper.

i bleed blue, the stuck throttle (high idle) never appeared again and the dealer never found anything. We've got a mechanical throttle so thankfully nothing like the recent Toyota crap can happen, but it still sticks in the back of my mind that some electronically controlled emissions equipment could've caused this and that the electronic glitch that caused it is waiting for another day.

FYI, here's the write up I gave to my dealer after it happened:

April 19: Rode to the grocery store. Had a full throttle blast (the first time I'd ever done that) in 2nd-3rd-4th from about 30 mph up to 120 mph entering I-70 eastbound at Crysler. Coasted down to 70-75 mph and cruised to the next exit at Noland road. When leaving the interstate the bike seemed reluctant to stop. Pulled the clutch in and the engine reved to 6,000 rpm all by itself. Pulled over to the shoulder and took my hands off the throttle. Still 6,000 rpm. Blipped the throttle a few times and let it spring back on its own with no effect. Turned the bike off, then restarted it with no effect. Decided to ride home being careful. Pulled away feathering the clutch heavily with the engine still maintaining 6,000 rpm on its own and the very second I shifted into 2nd gear it dropped back to normal. Did not hear anything that would indicate there was debris stuck in the throttle bodies that dislodged and then was injested by the engine. No abmormal sounds at all and apart fromt the elevated rpm the engine sounded and responded completely normally. No further difficulty on that ride.

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