TPS clicks - 18 not 20

30csl

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Hi all,

It seems the full cycle of a TPS should yield 20 clicks - mine only does 18 - before I open it does the number give any clue to the problem? Should i open it and clean to tracks and try again or watch it progress to see which ones it crosses without clicking?

Thanks,

Rohan
 
Two things spring to mind.

First, it might be possible that your TPS is maladjusted or otherwise prevented from making a full sweep to wide open throttle. So the first thing you might check is full throttle engagement.

The more likely possibility is that an armature is not making contact with two points of the circuit board. This could be due to wear, dirt/corrosion, circuit board warpage, or even a bent armature. Unless your TPS is fairly new, I would suspect dirt.

Prying the TPS cover off is relatively simple - unless it has been glued down. If you are careful, you should have no problems. Be easy with the plastic "tangs." A butter knife might be more helpful than anything too sharp.

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Thanks Lloyd, I'll pry the cover off and have a look. I guess if it wasn't making WOT I'd be missing one click? The throttle has full movement. It seemed as if injector 2 never clicked through the range so I wondered if 18 signalled a duff injector. I understand these TPS' aren't available new now?

Thanks,

Rohan
 
Hard to determine throttle position sensor condition - without looking at it. It may seem to function fine using an ohmmeter, but like most electronics with mechanical/moving parts, it is prone to wear.

Because one portion of the TPS is designed to rotate while the other portion is stationary, some TPSs may seem a bit more sloppy than others. This situation may be analogous to worn throttle shafts or the rotating vacuum advance/retard plate upon which the ignition points are fixed. I suppose the best advice is to minimize the movement by keeping things clean and slightly lubricated. The circuitry may have some gold plating and the working elements may be protected from the elements. Still, it doesn't take much to penetrate the protective barrier. Pressure washing is probably not the best idea, unless you need an excuse to replace electronics.

When I mentioned full throttle movement, I was thinking that maybe something with the throttle linkage was preventing full throttle movement. I haven't looked at a djet TPS in a long while, but I always thought the "clicks" emanated from the TPS, itself. An injector that fails to "click" and move its pintle, is something else.



Gratuitous pintle pictures

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iu



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Interesting negative camber

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Will it fit.
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Will it float
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Murray :)
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Last edited:
TPS.jpg


Did you not get the memo about the TPS reports?
 

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