Only mod is my exhaust. I noticed right after it was installed.

Where are the spark plugs located at?

 

Ok, here's my thoughts...

since you said you unplugged your battery, I'd imagine it was quiet a while before you replugged it back in. So you might have re-set your ECU, which after the first time you turnback on your car, it recollects all the info on your car to remap your gas requirment.

Assuming your cut off INCREASED your back pressure, which causes the engine to user more power to open up the valves for exiting gas, thus making your milage go up.

I'd say if you are still under warranty, go get it checked at dealer

OR, better yet, buy my 02 Yellow OZ for 9G

 

read this..

https://www.evolutionm.net/features/article/uslancer/15

 

Sorry for the confusion but I did not unplug my battery yet. I know that if you dont unhook your battery then your car will eventually learn the new air flow. How long will it take if you dont disconnect your battery.

 

I think a few mins....I'd suggest you do that after an oil change, so it'll pick up the maximum benifical mapping for your flow.

But say if you have time on your hand for an oil change yourself, let it sit unplugged for a few mins will do I think. To be on the safe side, keep it unplugged for a while.

 

again, I don't think this will cost you this much of an mpg change.

Maybe you are too hasty to judge, keep track of your gas calculation for a few months then see. Not just one time deal. (I had a close to 40 mpg once, I am sure I calculated right, but I ignored it anyway)

 

So from the thing I looked at about the spark plugs is that all four of them located right on top of the engine.

 

right...they are not hard to find...though it might be easier to remove the engine cover first then removing the sparky pluggy.

 

umm i would just recomend a spark pug socket and an extension its very easy just remove your coil packs and plug wires then remove the spark plugs either replace them or check the gap on the plugs and make sure they are not fouled. Takes about 30 mins to complete

 

just do a basic mainentenance tune up I think people want to think that they have severe problems when it is just a simple fix. Also if you muffler you put on was a cheap knock off it could have increased back presure causing the loss in mileage

 

what should I look for to tell if my plug is bad.

 

Here is a picture of my plug

 

You have to many threads just keep it all in one I think you have like three threads for one thing. But refer to what I said in one of your other threads.

 

Didn't the original version of this thread include people mentioning why it's pointless to compare how many miles per tank because nobody fills up at exactly empty? If you can't divide miles on a trip meter by gallons filled, your information doesn't really help much. 1/4 tank is not an accurate measurement.

 

I'm getting around 34-40 mpg
I have AEM CAI
Greddy Catback, I still have my cat on
I have a manual
I run 93 fuel and i have rrm piggyback