i get about 16-17 mpg on the average. its not good at all..just took it to autozone today and they scanned it. got the error code 402 for the catalytic convertor. i have a 2000 max with only 31,000 miles on it..i dont think its the cat. and a buncha other codes came out but they were all related to the tranny.. i got the 5 speed swap with a auto ecu. solenoids and some other stuff. so its just the code 402..
im getting iridium spark plugs soon and i gotta change my pcv or whatever.
maybe its my air filter??
im just lost

EDIT: and no..i dont beat on my car either

 

umm... only 31k?!

time to take a trip to the dealership and have them handle it.

 

3 years is up..5 speed swap kills alot of the warranty..

 

I'm a big fan of the air cleaner--it seems to make a huge diff. in the winter and on the highway--dirty filter can cause only 23-24 on the highway in the winter. But I think it means less in the summmer and in city driving. Are you getting 16-17 in all city driving? If so, no biggie. But if you can take her out for about a straight 100 mile cruise and you still get that low, yes, something is wrong. Cheap way to find out, just buy a new factory filter. I don't recommend K&N, which is what I got.

 

A word to the wise ...the federal emissions warranty for your converter is 8yrs/80k ......later

 

stop doing burnouts!!! hehe j/k i dont think dealer is the solution(well it is, but expensive), find out what all the codes mean

 

so i can just go to the dealer with my greddy catback and ask them to replace my cat converter? Its covered as long as i have my stock cat converter on right?? i never changed it..

 

pretty sure they'll use your catback as an excuse not to do it

 

update: got the denso iridiums installed..cleaned out my air filter.
i dont think they helped much..maybe a lil..but not much
think its a dirty throttle body already????

 

try cleaning your TB anyway... the cleaning stuff only costs like 99 cents

 

how do you clean your TB with the TB spray cleaner?

do you take the air filter off and spray it into the TB while the car is running?

 

99cents? where? and what did you use???

 

great write up here
i picked up a can of intake cleaner for like 3.25. it said it had synthetic cleaners, which i am not sure of but it worked like a charm. from what i can remember, it was made by valvoline.

 

great write up here
i picked up a can of intake cleaner for like 3.25. it said it had synthetic cleaners, which i am not sure of but it worked like a charm. from what i can remember, it was made by valvoline. you can get it from any parts store or even walmart-target type places. ive been told to stay away from carb cleaner as it is more harsh than intake but that may be a falsity.