Does anybody know the manufacturer of our stock ISC valve? I'm doing some remote tuning on my car and am not able to take the UIM off to check it out. If someone happens to have one handy that can take some macro photos of it as well as any part numbers or would be willing to just let me know what markings are on there that'd be great. Thanks!

 

remote tuning?

 

This is whats on the tag. Denso N3A1 138200-D440 BACV

 

Let me know if you need more info or pics

 

Not as cool as it sounds, fiddling with my SM4 cal from afar and then having it loaded up for me. The stock ISC is being a bit of a pain however.

Awesome thank you much! I think this should be enough info for me but that looks like a Mazda part number is there a Denso specific part number as well? Would you mind taking a macro shot of the actual tag? I'm running into an issue where the SM4 should be sending 0 PWM signal and I'm still getting far more bypass then I want.

 

I have detailed this in other threads: according to the service highlights and FSM documents, it is a 244hz valve. Are you running it at 244hz? I'm not familiar with the EMS you are running, but here are some suggestions I will throw out there.

During the factory idle set procedure, the ISC is fixed at 38% duty by jumpering the diagnostic connector. You could try setting it to that as a fixed duty and then adjust the TB screws to get your base idle. Then dial in your idle ignition timing corrections, deceleration idle speed settings, A/C and electrical load corrections, etc. The other option is to set the idle speed mechanically with the ISC completely off (0% duty) and then adjust your correction tables. If you have to turn the throttle adjusting screw (which sets the primary throttle opening angle) make sure you recalibrate the TPS afterward.

When this happens (ISC is effectively turned off in the ECU), does physically unplugging the ISC with the engine running make a difference in idle speed? It shouldn't.

 

thanks fellas and ladies if appropriate, i dont get much net time so dont have time to search ,
so now knowing its the isc can i remove this and blank it off or should i leave it hooked up(i have a blanking plate if necessary)
cheers jason

 

Jason,

You have time to post, but you don't have time to do a SIMPLE search...

https://www.rx7club.com/showthread.p...ht=removal+ISC