dont know about better gas mileage cuz you'll be spending more money on the 91-93 octane gas.

you jump the service plug behind the glove box.


how-to for bunch of DIY mods.
http://members.tripod.com/~Pre_ludE/pmods.html

 

The reason you run higher octane when you advance your timing is because the higher the octane of the fuel the more heat energy is needed to ignite it. So you run less of a chance of pre igniting the mixture (detonation) with your timing advanced.

If your car is completely stock just run 87 octane. The car will burn the fuel more effciently then 91 or 93.

On OBD-II vehicles the timing is completely controlled by the ECU. It advances and retards the ignition timing based on many different factors and input from the sensor to maintain economey and performance when needed.

On OBD-1 you need to jump the ECU connector, most likely disconnect all vacum lines to maintain idle, then flash your timing light and move the distributor in the correct direction to either advance or retard your timing. When you are done tighten down the distributor reconnect the vacum lines and remove the jump and there you've just adjusted your ignition timing.

I strongly recommend you leave it within specs unless you know what you are doing.

 

I run Advanced Timing on my '90. Well, as far as I can go on 87 Octane. Stock is 16 I have it set to 18BTDC. I enjoy the better throttle response with it advanced. I wouldn't do it so much as to require higher octance though, that would be a waste.

 

no, i'm not doing it to run higher octain, i'd like to get a little performance out of it...and it'd be an added bonus for better gas mileage.

18btdc? what's that mean?

oh, and do you have any pics that could help?

 

BTDC- Before Top Dead Center. The point at which the piston reaches the top of its stroke in the cylinder.

 

:slap: do not answer questions in 3 year old threads.

 

Hey, everyone tells people to do searches, and people aren't as curious to see when they were posted. I actually write replies to threads I find through searches, then I delete them when I realize the thread is too old.

...but at least the guy finally got his answer now =P

 

this is very true...people yell at people for not searching. then when they do search and get carried away and just reply...everyone yells at them. glad he finally got his answer. also glad this thread is somewhat finished. if more threads are finished....then people wont have to search so hard.