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Old     (blinerinbrazil)      Join Date: Dec 2006       05-24-2009, 6:31 AM Reply   
HI all, I'm having some problems with my engine (indmar tbi 310hp). I've changed out the fuel, pump, fuel filter, and cleaned the IAC. Iguess the next step it the TPS. IS this a bolt on part? Can I just take the old one out and put the new one on or do I have to make some sort of adjustment? thanks
Old     (chpthril)      Join Date: Oct 2007       05-24-2009, 7:59 AM Reply   
Just test it with a volt meter before spending the money! All you need is 1 DVOM (digital volt meter) and 2 straightened out paper clips.

Not 100% sure on wire colors, but not hard to figure out which wire is which. The TPS is a 3 wire sensor, it has a ground (probably black) a 5v reference (they're pink on autos) and then a signal return wire. The ground will be one of the end wires, the 5V ref will be the other end wire, and the signal return with be the middle.

(1)With key "ON", take the meter and paper clips and gently back probe the the ground and 5V ref (the 2 outside) wires with meter. It should read 4.5+ - OK. Next, leave the gnd probe in place and move the other lead to the middle, signal return, wire - it should read somewhere between .23-.65 volts. Next, have an assistant slowly open the throttle all the way to WOT, engine off of course. The voltage level on the signal return wire should reach 4v's or better. The closer to 5v it goes, the better, but typically over 4 indicates WOT.

In step one, if the the meter doesnt read 5V (may be a little less, that's ok as we are looking to be close to the 5V's), then you need to look at the ground and ref wire individually to see which is having an issue. Move the meter's red lead to a battery source - it should read 12+ (battery voltage) if the ground it good. Then, with the red probe back in the 5V ref, move the meter's blk lead to the battery ground and again note the voltage level on the 5V ref wire.

If the TPS's 5v ref and ground are good, but the voltage level at throttle closed is not within limits, then the TPS is faulty or needs adjusted. If the TPS is not reaching 4V+ at WOT, the TPS is faulty or the throttle is not able to open to WOT.
Old     (blinerinbrazil)      Join Date: Dec 2006       05-24-2009, 1:36 PM Reply   
Tigemike- I used a digital ohm meter and the most I got was 3.5 at wot so I guess the tps is the problem. How do I adjust it? thanks
Old     (chpthril)      Join Date: Oct 2007       05-24-2009, 1:50 PM Reply   
What was the voltage on the 5V Ref wire? What was the closed throttle voltage on the signal wire? Did you verify that the throttle was wide open? If not, you have a cable or linkage problem. The tps needs to be set based on the closed throttle voltage, not the WOT voltage. Not enough info to condemn a part or make an adjustment.
Old     (kko13)      Join Date: Jul 2006       05-24-2009, 2:01 PM Reply   
remove the cable and move throttle body by hand and recheck that will tell you if the cable is not getting the throttle all the way open.
Old     (blinerinbrazil)      Join Date: Dec 2006       05-24-2009, 8:52 PM Reply   
ok I'll try it and get back to you all.


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