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Thread: 300x tps voltage sweep
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04-01-2018, 11:38 AM #1
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300x tps voltage sweep
When doing a voltage sweep of the tps on a 300x with the engine running is it normal for the engine to revup on it's own?
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04-01-2018, 12:05 PM #2
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the voltage of the TPS is the only way the motor knows where the throttle is at and therefore how much fuel to add or take away...So yes ANY FLUCTUATION IN voltage will cause the engines rpm to increase or decrease....
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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04-02-2018, 04:24 AM #3
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My rpms gradually increase as I
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04-02-2018, 04:30 AM #4
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My rpms gradually increase as I increase the voltage but then when I reach a certain point the rpms increase 2k or more?
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04-03-2018, 11:18 AM #5
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is this in water in gear or just freereving?
Originally Posted by 65gamblerman
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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04-03-2018, 01:57 PM #6
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If it is a opti the tps will call for more air and fuel through the compressor dfi system befor the throttle plate opens and map sensor speed density starts to control a/f
why it jumps rpm my be in the performance profile as load normally goes up about 1500-2500 when you start to climb on plane.
It’s why troll control works on some but not ski tow. The pcm (propulsion control module) can adjust timing. Dfi and fuel injectors to bring rpm up, ski tow takes the electric throttle.
you will get the same reading with key on engine off. And doing a key off ohms sweep will catch dead spots better. Unless you after a vibration condition.Last edited by Motv18; 04-03-2018 at 02:00 PM.
'06 Tracker All-Fish/Tournament V-18 90 Optimax, 46.8 gps Goal one complete reach 45 mph.
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