Plain Jane OEM nothing to see here rebuild

[JustJeff]

Originally Posted by vrracing

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Don't forget the ISC. I grounded it straight to the negative terminal as I found that the bolt I was using under the main fuses wasn't working as a ground.

Is the ISC the same as the single green harness used to get CEL codes?

When checking timing I never jumpered anything. I simply got it warmed up, idling around 800ish and pionted a timing gun.

[Pete_89T2]

Originally Posted by JustJeff

I guess next up is to test AFM/MAF. One thing to note, I have a Cosmo AFM/MAF for a 13B. I'm assuming that could be a factor in the rich idle?

That could very well be the case, at idle and elsewhere in the power curve as the ECU uses the AFM as a primary input to manage FI. Is the Cosmo AFM a different part # than the original AFM that went with your ECU? I know AFMs are not interchangeable between S4 & S5 or T2 & NA's. I have no idea if the Cosmo AFM is interchangeable with anything else. What's the reason for using the Cosmo AFM, larger diameter opening/better flow?

Originally Posted by JustJeff

Is the ISC the same as the single green harness used to get CEL codes?

When checking timing I never jumpered anything. I simply got it warmed up, idling around 800ish and pionted a timing gun.

I think that's what he was referring to - the single terminal green connector by the battery that you ground when checking CEL codes, adjusting idle and timing. When grounded, the ECU inhibits the BAC from messing with idle speed, which you'll need to check/adjust idle or base timing.

[JustJeff]

Originally Posted by Pete_89T2

That could very well be the case, at idle and elsewhere in the power curve as the ECU uses the AFM as a primary input to manage FI. Is the Cosmo AFM a different part # than the original AFM that went with your ECU? I know AFMs are not interchangeable between S4 & S5 or T2 & NA's. I have no idea if the Cosmo AFM is interchangeable with anything else. What's the reason for using the Cosmo AFM, larger diameter opening/better flow?



I think that's what he was referring to - the single terminal green connector by the battery that you ground when checking CEL codes, adjusting idle and timing. When grounded, the ECU inhibits the BAC from messing with idle speed, which you'll need to check/adjust idle or base timing.

I ended up with the Cosmo AFM by accident and many years ago. My original turbo swap was done by a shop in Indy, AIM Tuning. While getting parts together for the swap I bought off eBay what I was told was an turbo RX7 AFM. I didn't know any different till many months later when the swap was completed. By then I couldn't go back to the seller so I used it. I've been using it since oh...about 2008 or so. No issues...well till now :P

At one time you could read the part # and that's how I verified it's a Cosmo, but now that sticker has been worn down quite a bit.

Thanks for the heads up on jumpering that, this is the first I've read about it.