Loss of acceleration on 2007 c90T - Motorcycle-Journal Forums

Ol Doofus · 05-19-2007, 01:20 AM

Started having acceleration problems 3 weeks ago. The scenario; leave the house, go about 3 miles, try to accelerate and the bike won't. I keep throttling up and eventually it will break loose and run like a scared rabbit. I have no more trouble until I let it set for several hours and it will happen again. The FI light does not come on. I took it to the shop and they ran diags and could not find anything. They were able to duplicate the problem. I picked up the bike and they were going to call Suzuki. I did not ride for a couple of days and when I rode again, it did not happen. I called the dealer and we put things on hold. I rode 4 different days with no problems. Last Sunday it happened again. They are supposed to be getting in touch with Suzuki. My dealer has not seen this problem before. I feel certain we will get it resolved but I was wondering if anyone else has had this problem.

Cimco · 05-19-2007, 03:45 AM

That's got to be a PCM problem.
I wonder if it's a loose chassis ground from the computer assembly to the bike.

Most intermittent or temperature sensitive bugs are the ground connection.

Ol Doofus · 05-19-2007, 03:56 AM

Thanks Jim, I will take that info with me today when I head to the dealer to see if they have any info yet.

Rickster · 05-22-2007, 07:43 PM

Sounds like you might have a bad gas cap.
your vent could have something in it, and be pluging up, off,and on causing a vacuum in the tank, and starving the engine for gas.
Next time it happens, loosen your gas cap.

Time4me2ride · 05-23-2007, 10:32 AM

It could also be an intermittent connection on one or more of the sensors that are giving information to the computer. Especially since it sounds like it is a problem when cold and goes away when the engine is hot.

Ext1jdh · 05-23-2007, 10:46 AM

when it happens does it feel like it's dogging or does it maintain the same power? I have as much mechanical knowledge as a pile of sand, but it may make all the difference.

If it's dogging, then I'd think that Rickster's right and the powerplant is starving for fuel, or that the throttle cable is fracked. If it is maintaining power but just not increasing, I'd lean toward a PCM issue.

Then again, I work on computers, not bikes. I know nothing.

jkersh · 05-23-2007, 10:50 AM

My father in law had the same problem the other day. Going down the road and had no throttle. He parked the bike and found that the grip was loose. He pulled it off and used the sleeve to get him home.

wildwolf · 05-23-2007, 01:54 PM

You could have a flat/compressed/pinched fuel line as well.

If Bull's a member here...he could explain better what I'm talking about.

05-19-2007, 01:20 AM	#1 (permalink)
Ol Doofus Seat Tester Joined: Jan 2007 Bike: Black 2007 Suzuki c90T Location: Shenandoah, Va Posts: 54	Loss of acceleration on 2007 c90T Started having acceleration problems 3 weeks ago. The scenario; leave the house, go about 3 miles, try to accelerate and the bike won't. I keep throttling up and eventually it will break loose and run like a scared rabbit. I have no more trouble until I let it set for several hours and it will happen again. The FI light does not come on. I took it to the shop and they ran diags and could not find anything. They were able to duplicate the problem. I picked up the bike and they were going to call Suzuki. I did not ride for a couple of days and when I rode again, it did not happen. I called the dealer and we put things on hold. I rode 4 different days with no problems. Last Sunday it happened again. They are supposed to be getting in touch with Suzuki. My dealer has not seen this problem before. I feel certain we will get it resolved but I was wondering if anyone else has had this problem. __________________ Not very fast, just steady.

05-19-2007, 03:45 AM	#2 (permalink)
Cimco Fender Buffer Joined: Apr 2007 Bike: 06 Suzuki C50T Location: Roseville CA Posts: 408	That's got to be a PCM problem. I wonder if it's a loose chassis ground from the computer assembly to the bike. Most intermittent or temperature sensitive bugs are the ground connection. __________________ Older maybe not wiser...

05-19-2007, 03:56 AM	#3 (permalink)
Ol Doofus Seat Tester Joined: Jan 2007 Bike: Black 2007 Suzuki c90T Location: Shenandoah, Va Posts: 54	Thanks Jim, I will take that info with me today when I head to the dealer to see if they have any info yet. __________________ Not very fast, just steady.

05-23-2007, 10:32 AM	#5 (permalink)
Time4me2ride Sprocket Pilot Joined: Oct 2005 Bike: Silver/Grey VStar1300 Location: Colorado Springs Posts: 846	It could also be an intermittent connection on one or more of the sensors that are giving information to the computer. Especially since it sounds like it is a problem when cold and goes away when the engine is hot. __________________ Carpe equus ferrum

05-23-2007, 10:46 AM	#6 (permalink)
Ext1jdh Top Gear ! Full Throttle! Joined: Apr 2005 Bike: Sold Location: Elgin, IL, US Posts: 5,257	when it happens does it feel like it's dogging or does it maintain the same power? I have as much mechanical knowledge as a pile of sand, but it may make all the difference. If it's dogging, then I'd think that Rickster's right and the powerplant is starving for fuel, or that the throttle cable is fracked. If it is maintaining power but just not increasing, I'd lean toward a PCM issue. Then again, I work on computers, not bikes. I know nothing. __________________ I am lurking. I am likely to be eaten by a grue.

05-23-2007, 10:50 AM	#7 (permalink)
jkersh TurtleWax Taster Joined: Apr 2006 Bike: '02 750 ACE Location: 34 59.613n 094 30.852w Posts: 593	My father in law had the same problem the other day. Going down the road and had no throttle. He parked the bike and found that the grip was loose. He pulled it off and used the sleeve to get him home. __________________ There's only two things I hate in this world. People who are intolerant of other people's cultures and the Dutch.

05-23-2007, 01:54 PM	#8 (permalink)
wildwolf Fourth gear and illegal Joined: Jan 2006 Bike: 1999 vs800 intruder Location: Delta Junction, AK Posts: 705	You could have a flat/compressed/pinched fuel line as well. If Bull's a member here...he could explain better what I'm talking about. __________________

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