Since my recent 3VZE HG repair, I have been playing around with the idle speed and ignition timing settings. It is quite easy to set it to factory 750-rpm, 10* BTDC, and for what I need, the performance is OK. However, I like the feel of the engine more when it is about 1000-rpm, 15* BTDC.

My question is, what are the pros and cons of doing so? Obviously it has a little more power at that setting. What do I risk regarding emissions, fuel economy, and long term engine damage? Are there other considerations? Should I just leave well enough alone at the factory settings?

Thanks for the insight, in advance (bad pun, sorry).

 

Hard to say man, first off do you have any mods or is your engine stock? If it's all stock leave it at stock.

EDIT: nice punn

 

No mods, just stock.

What might happen if I bump it up a bit on the stock engine?

 

Usually best to leave it stock, but if u want to do it your gas millage will drop by 10% or so, i drive in alot of stop and go traffic, so i set my idle to 1000 just so i can creep easier. but that being said, you will not be able to pass emissions, you can damage your cat. over a long period of time, and will most likely cause your pilot bearing to wear out faster, may even damage auto trans too but i'm not sure as i have nvr done this to an automatic vehicle.