Need help with ISCV

blip said:

So this is a little off topic but close enough that I'll post it here rather than it's own thread.
I have reason to suspect my TPS so I plugged in tuneECU and it showed as 0.59 to 0.60 for the primary TPS voltage and 0.70 to 0.72 for the other. The fluctuated between those limits.

The other thing that fluctuated was my throttle position it would sit at 1% and then hit 0% occasionally and back and forth this is on the main diagnostic screen.

I know from the manual that I should TPS reset but I don't have dealer tool and the first step is to close the throttle position using a button in dealer tool. Does anyone know if TuneECU can be used for this adjustment? Also ... is the fact that my voltage is fluxuation sign of a bad TPS? (I hope not cause laconia is only 7 days away and it is minimum 10 for a new part )

Click to expand...

Speedy said:

Quite the opposite. At 705 your vacuum is lower than normal. The throttle blades are open more than normal. Something is making your engine "work" harder to keep running. Anything that affects timing can do this as well as a cam that has jumped a tooth. Can also be a large vacuum leak. Start with a timing check which you can do by monitoring on Tuneboy. You can watch the timing for each cylinder while the engine is running. Coil saturation time should be close across all the cylinders as well. The timing should be close to what is in the neutral timing table for that rpm. Then wiggle hoses and the entire throttle body assembly to see if the MAP reading changes. If it does you have an air leak. If you still find nothing, and the tune is not screwed up, your problem is more serious. Check one thing at a time. Good luck.

Click to expand...

Kenneth67 said:

I did the MAP reading again and now it's around 580 when 1200rpm, so would probably reach 620 by idle. If it didn't bog and die, which it still does. Weird!
I watch the ignition timing in tuneboy while running, but tuneboy is a little slow, and updates every few seconds if I'm lucky, so it's difficult to get readings.
My secondary TPS is off setpoint, I'll correct that and after this will try testing HT leads for resistance. Maybe replace spark plugs too.
Thanks for your help anyway.

Click to expand...