Thundermax decel throttle question
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Tourer
Joined: Aug 2007
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From: Kalamazoo, MI
Thundermax decel throttle question
I've got a Nightster with pipes and an A/C and sometimes when I'm coming up to a stop and I'm downshifting I'll blip the throttle to match the revs and once in a while when I do this the revs dont come up and the bike will make a "ccchhhh" sound. I'm not sure if its running to rich and can't ingnite all the fuel or if there isn't any fuel there to ignite. I basically did a "plug and play" with my TMax so I'm set at all the default settings. Any suggestions?
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Joined: Mar 2007
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From: Woodstock, Ont , Can
RE: Thundermax decel throttle question
In the basic module settings you may need to increase the value for accel fuel. For what it's worth, on mine it set to 10.0
Normally the decel function is set to 0 and not functioning but if your's is set to 1 it is. In this case the decel low number may be set too low, or the post decel fuel enrichment may be low also. Again, mine is set to 16.08 default, but I don't use the decel part. You may need to juggle the numbers to fix yours. Check for an intake leak first before doing anything.
Ron
Normally the decel function is set to 0 and not functioning but if your's is set to 1 it is. In this case the decel low number may be set too low, or the post decel fuel enrichment may be low also. Again, mine is set to 16.08 default, but I don't use the decel part. You may need to juggle the numbers to fix yours. Check for an intake leak first before doing anything.
Ron
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RE: Thundermax decel throttle question
This "ccchhhh" sound.....is it like a cough or pop sound? From the right side? If so, then it's probably backfiring through the air-cleaner. Link to the ECM and remove some Accel Fuel. The default for map 390 (Sportster 1200 motor) is 12.0. Lower it to 11.0 and see if that helps. Page 63 in the TMax manual has all the info on Accel Fuel...
If that sound isn't a pop in the intake then give us more to go on with the sound....
If that sound isn't a pop in the intake then give us more to go on with the sound....
Banned
Joined: Mar 2007
Posts: 3,706
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From: Woodstock, Ont , Can
RE: Thundermax decel throttle question
Duh, I didn't pick up on the fact it was a Sportster, so my numbers will not apply,however spitting back through theTB is lean. At least we both picked the same area to work on
Ron
Ron
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From: Illinois
RE: Thundermax decel throttle question
ORIGINAL: mcouture
This "ccchhhh" sound.....is it like a cough or pop sound? From the right side? If so, then it's probably backfiring through the air-cleaner. Link to the ECM and remove some Accel Fuel. The default for map 390 (Sportster 1200 motor) is 12.0. Lower it to 11.0 and see if that helps. Page 63 in the TMax manual has all the info on Accel Fuel...
If that sound isn't a pop in the intake then give us more to go on with the sound....
This "ccchhhh" sound.....is it like a cough or pop sound? From the right side? If so, then it's probably backfiring through the air-cleaner. Link to the ECM and remove some Accel Fuel. The default for map 390 (Sportster 1200 motor) is 12.0. Lower it to 11.0 and see if that helps. Page 63 in the TMax manual has all the info on Accel Fuel...
If that sound isn't a pop in the intake then give us more to go on with the sound....
Thread Starter
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Tourer
Joined: Aug 2007
Posts: 366
Likes: 0
From: Kalamazoo, MI
RE: Thundermax decel throttle question
ORIGINAL: mcouture
This "ccchhhh" sound.....is it like a cough or pop sound? From the right side? If so, then it's probably backfiring through the air-cleaner. Link to the ECM and remove some Accel Fuel. The default for map 390 (Sportster 1200 motor) is 12.0. Lower it to 11.0 and see if that helps. Page 63 in the TMax manual has all the info on Accel Fuel...
If that sound isn't a pop in the intake then give us more to go on with the sound....
This "ccchhhh" sound.....is it like a cough or pop sound? From the right side? If so, then it's probably backfiring through the air-cleaner. Link to the ECM and remove some Accel Fuel. The default for map 390 (Sportster 1200 motor) is 12.0. Lower it to 11.0 and see if that helps. Page 63 in the TMax manual has all the info on Accel Fuel...
If that sound isn't a pop in the intake then give us more to go on with the sound....
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