tamz273

I took my car to a dyno today and was shocked with the results... I know I have a misfire since I replaced my pulley with a UD one. So everytime the car hit 5k the tachometer gave out and the CEL started blinking and then stayed on... Here are the sheets. The run was on a dynojet.

For mods I have:
RP Midpipe
Greddy sp2 Catback
Injen Short Ram Intake
ACT Prolite Flywheel
AP UD Pulley

Any thoughts?

alz0rz

iTrader: (41)

Did you have DSC turned off?

And if it was a misfire.. then get that fixed and re-dyno..

Jon316G

iTrader: (1)

Did you reset the e-shaft profile after your pulley install?

tamz273

DSC was turned ON, I didnt turn it off.. And I DID reset the e-shaft profile SEVERAL times after the pulley... But I wrote in the other thread (about my pulley) that I bent the gear-looking disc behind the pulley.. Seems like the sensor for the e-shaft.. Could the be the reason im throwing a CEL at 5k+ RPMs?

Jon316G

iTrader: (1)

Yeah... the e-shaft sensor is an inductive proximity switch that reads those teeth.
It calculates a certain amount of pulses from those readings and if it falls outside of tolerance, it'll throw a code.
So if the plate is bent and the sensor isn't picking up all the teeth, its not calculating the correct number of pulses.

tamz273

Yeh I thought so too, but the plate isnt bent more than like 30 degrees at the MOST.. although there are several teeth bent between 0-30 degrees.. Could that be it? Or do they have to be REALLY bent (90 degrees +) in order to make a difference?

Jon316G

iTrader: (1)

There is very little gap between the sensor and teeth.
So a 30 degree bend is pretty bad.

tamz273

Alright.. So just out of curiosity, why does it now go off at low RPM, only when it gets past 5k?

Jon316G

iTrader: (1)

Anyone who works with prox switches can tell you that the faster a component gets, the less pulses it'll count (depending on the sensitivity of the sensor itself).
The surface mount machines I work on use the same style senors to track the chain conveyor speeds.
If I speed the chain speed up too much, it'll fail for pulse counts outside of tolerance.

So you are probably just on the edge of the sensor's "beam" and turning slow gives it time to see the barely "visible" part of the teeth.
Speeding it up doesn't give the sensor time to respond to less sensitive readings.

tamz273

Awesome.. I keep learning and learning from this forum!! Now off to the second question, what is the part called? Or where can I find one? Is it a common part I can find from online vendors?

Jon316G

iTrader: (1)

Its an e-shaft positioning plate.
Honestly, I would remove the plate and try your best to straighten it.
Again... it'll allow some "waves" on the plate, but try to get it as straight as possible.
And since you already had the pulley off, it shouldn't be as difficult to remove this time around.

tamz273

Sounds good.. Ill give it a shot tomorrow and let you know how it goes.. If worse comes to worse, can I buy a new plate?

Jon316G

iTrader: (1)

The parts catalog shows that plate combined with the pulley and other components... no separate part number.
If straightening it doesn't work, make a posting in the Buy/Sale thread and see if someone has one.