I recently installed a Apex v-afc and changed my head gasket on my 93 Prelude Vtec. It was running ok but it couldn't idle very well for a couple of days. Actually it hasn't been idling very well for a while now. Anyways then all of a sudden the check light comes on. The code reads 21(Vtec code in the manual). I was told it was the TPS (Throttle Position Sensor) so i changed it. It drove but still couldn't idle. Then the check light comes on again, it Still reads 21. I notice my air/fuel ratio meter now just sits around the Lean area. I recheck the wires for the v-afc and found that i wired it wrong. Now im for sure it's wired right, so I bought another TPS and installed it. Now it wont idle, air/fuel meter still on lean, and check light still reads 21.
Is there settings on the v-afc that i need to set?
What are your Settings: Throttle position %?

Another though: Vtec kicks but redlines early at 6400. Supose to redline at 7400.
Also losing compression 180,155,155,155

 

anyone
TPS is 7 but The check light reads 21 for vtec but the shop manual tells to check the TPS. Also vtec still kicks in, and the early redline shows that something is happening with the TPS. But someone please prove me wrong

I was told that it could be my o2 that causes it to over heat, because of over carb causing it to clog. Therefore the ecu reads that it doesn't have enough Oxygen, sending a signal to cut lean. that could me where the lean reading for the gauge comes from. But there isn't a check light for the o2. hmmm... What do you think? But still i'll change the o2 today.