Advancing OBD-II timing on an accord
 

I was tweaking my AFC-2 for better mpg and so far I have gotten a 5mpg increase just by backing off my fuel by 20% at low throttle, but I get bucking with anything over and I need to advance the timing a little more now and I can't.

I was thinking I can drill out the holes on the distributor longer so I can adjust it, but I don't know if it will work or not since it's OBD-II. I don't want to do an OBD-II to OBD-I conversion because this is still an automatic car and the auto transmission is controlled by the ECU.

Will this work to advance timing on my OBD-II Accord?

Re: Advancing OBD-II timing on an accord (technine)
 

I was never able to physically change the timing with the dizzy on my 96 OBD2 F22B2. I'm pretty sure that it is ECU controlled. I also thought about drilling out the holes but never tried it. I converted to an OBD1 ECU in stead.

On another note I am just wondering what, if anything, you are using to monitor your AFRs & EGTs? It's great that you are getting 5mpg more. But do you have a way to make sure that your not running the risk of leaning it out too much and melting something?

Re: Advancing OBD-II timing on an accord (GhostAccord)
 

For now it's an NA engine and I monitor the AFR with a wideband. I was thinking about the EGT's, but it doesn't get rediculously hot at all and stays stock temp on the water gauge. Nothing melting over hear. I did this with my other F22b1, but that one was turbocharged and I got 31mpg with that.

This is ONLY for part throttle, anything above 20% is stock fuel trim.

Did you try taking off the bolts and turning it and checking the timing after? I'm going to give that a try this weekend and see if it works.

Re: Advancing OBD-II timing on an accord (technine)
 

Cool, just wanted to make sure that you weren't going to melt something. https://honda-tech.com/forums/images/smilies/emthup.gif

Instead of drilling out the dizzy have you thought about maybe buying an adjustable cam gear?

Re: Advancing OBD-II timing on an accord (GhostAccord)
 

Wow, never thought of that. I guess that would just about do the same thing. Maybe I'll look into that because I was just checking out the distributor and there is not as much metal there to drill longer holes as I would like.