Blew the intake boot off, now the idle is high...

[radguzzi]

Blew the intake boot off, now the idle is high...

This past week I was out geocaching on the V11 Cali Jackal and the frequency of the stops on the straight, busy city street was nearly every tenth of a mile, probably should have used the bicycle but I didn't. 

Well the engine gets hot of course but really no more than when in slow moving traffic or when stopping at traffic lights every friggin' tenth of a mile, I didn't think too much of it until, at one restart, the left side intake runner/boot/manifold rubber burped off the actual intake manifold on the head.

I pulled the m/c into the parking lot, pulled out the trusty Leatherman and loosened the clamps, slid the rubber back into place, adjusted the rest of the assembly back into the air box as need and rode off.

Directly after I noticed that the idle was higher than it had been prior to the incident.

When I got back home I loosened everything back up and readjusted the assemblies, both sides in fact however, the idle is still too high, not by a great deal mind you, just higher than normal.

I cannot imagine what took place to have the idle gain during the burping incident...? ? ?   ???

To make the idle go down, I can actually reach down on the left side, push the linkage against the direction of the pull of the assembly and the idle goes back down.

The Big Question:
Can I simply turn the idle adjustment screw on the right side by 1/4 turn to bring it down or will that mess up TPS settings or TB balancing..?   I am not adept at tuning on the more modern FI engines, I should be but I am not... :-[

Thanks much,
Rob

[rdbandkab]

Could you have tweaked a butterfly?

[Cheese]

Or perhaps a vacuum line came off the manifold or separated downstream somewhere?

[twhitaker]

Make sure the linkage rod is not fouled on adjacent components. Throttle cable too.

[PeteS]

Did you loosen both throttle bodies before tightening everything up? When the one side blew off it likely tugged on the opposite side. BTDT.

Pete

[radguzzi]

Or perhaps a vacuum line came off the manifold or separated downstream somewhere?

Ahh, good idea, I'll go check... did not think to look at that although I was thinking air leak when the idle went up.  This engine has had the evap canisters removed though so the manifold hoses should be just plugs.  I'll have a peek.

Thanks,
Rob

Make sure the linkage rod is not fouled on adjacent components. Throttle cable too.

Yup, I did check that, the throttle moves very freely.

Thanks,

Did you loosen both throttle bodies before tightening everything up? When the one side blew off it likely tugged on the opposite side. BTDT.

Pete

Yup, when I got back home I loosened everything for just htat very reason, thinking that the other side had been tweaked.

Thanks

Could you have tweaked a butterfly?

Don't even say that...! 

Thanks,
rd



All good stuff, I just need to check it over again.

Any input regarding the idle screw on the right side..?

[twhitaker]

How do you tweak a butterfly? With all the nectar they drink I would think they are pretty excited already.

[Curtis Harper]

in 98 or 99 there was a recall on those bikes to add a return throttle cable, or a push cable as some call it. This is because the throttle bodies would move from time to time and the linkage would get hung up on the airbox causing the throttle to stick. May not be your problem, but make sure there is planty of clearance for the linkage to move. 

[rodekyll]

No, do not adjust the screw until you've found the problem.  The screw did not move in the incident.  Moving it now will just mask the real problem.  I think the problem will be discovered using the suggestions already given.  This is another one of those cases where being methodical and examining the details will make the difference.  Good luck!

[radguzzi]

Curtis,
This is the 2001 model... the issue did not start until the blown off boot. 

Thanks,
rd

This is another one of those cases where being methodical and examining the details will make the difference.  Good luck!

Yeah, I will run through the re-alignment process one more time. 

Thanks,
Rob

[Bill Havins]

Remember the TPS is at the bottom of the left throttle body.  That backfire may have "blown" (in more ways than one) the seal on the bottom of the throttle body and gone out through the air gap that exists between one edge of the TPS and its mounting surface on the bottom (the TPS only "seals" half way round its diameter).

If the other checks, above, do not fix things I would take a careful look at the seals on the top and bottom of the left throttle body (they seal around the butterfly pivot shaft).  Having gotten very, er, intimate with two sets of throttle bodies recently I have become very suspicious of those seals.  I believe they are responsible for all kinds of things, including climate change, inflation, deflation, and dandruff, among other things.

Good luck.

Bill

[radguzzi]

Well keep in mind that the idle only came up a tad (technical term, means I have no tach...  :D ) and I can make that go back down by just grabbing the left hand linkage bracket and pushing to the right slightly but firmly...  if that makes sense.

Good thoughts on the TPS though, I'll take a lok at it.

Thank you,
Rob

[fotoguzzi]

:D ) and I can make that go back down by just grabbing the left hand linkage bracket and pushing to the right slightly but firmly...  if that makes sense.
 

Thank you,
Rob

your sure the linkage is not dragging against the front of the air box?

[radguzzi]

your sure the linkage is not dragging against the front of the air box?

Dunno Brad, I'll check in the morning...  I went out to buy another guitar this afternoon right after work so I was in a rush and did not look at the linkage or TPS.

The throttle is very easy to operate so I doubt it but that's a good place to look so I will in the AM.

Thanks,
Rob