madmax98

I bought the sc300 2 months ago and it has been ranging from 12 to 14 MPG which is insane. Finally, i have sme time to take a look at it. I'm planning on changing the plugs, oil, oil filter, fuel filter, coolant, tire pressure, air filter and transmission fluid, of course i'm going to check compression
do you guys recommend anything else, or have you found something in particular to be the reason of poor millage in sc's? thnx in advance.

madmax98

oh and the car is a 98 SC with 81000 on the clock.

laxdude362

iTrader: (1)

Damn on a 98 with low miles. I would go ahead and do spark plug wires as well, dist. cap and rotor, seafoam (search for it on here), make sure you fill up with premium gas also.

fwynn

iTrader: (1)

yea seafoam is a must.. all well as all those things u mentioned..

soo

SEAFOAM first..
Change OIL
Change OIL FILTER
Change SPARK PLUGS
Change Wires
Change Air Filter
Change Tranny Oil
*Change Tranny Filter <-optional really...
Change FUEL FILTER when ur almost/to empty..
and the MAIN THING to save gas..
drive it normally ;] ahaha


u dont have to change coolant really... but i guess since ur changing all of em.. MIGHT as well huh?

93MSB

iTrader: (8)

do the 98's have distributors? i know 98 was the year they switched the na supra to the vvti w/ coil packs

bad o2 sensors could give you bad mpg too

madmax98

only God knows that i baby that car driving; i don't let the tach go over 2300 RPM. so i know it's internal. Do i get OEM wires and cap, or is there a brand you recommend?

madmax98

ya, the 98 SC has a distributer. and i don't have any codes for anything including O2 sensors.

comoSC

I've got a 98 SC and I don't have a distributor. I think we have a coil on plug distributorless system.

evileagle

dont forget to change your O2 sensors....

Curry

iTrader: (1)

The seafoam and air filter are probably gonna make the biggest difference. I just did mine the other day and the car is running even better and it stopped drinking gas!! I still have to do the plugs, wires, caps and fuel filter but im leaving the fuel filter to a shop since i hear its a pain in the ***.

madmax98

you're probably right because i don't see a distributor.

O. L. T.

iTrader: (17)

Luke_in_SD

any updates on this?

Luke_in_SD

bump on your results

Devir

There is no distributor for VVT-i engines.

Are there performance coil packs for these cars (sc400/300)? I'm also getting crappy gas milage on my sc400. 12-15 city if i am lucky. I have a nice 5 mile commute to work now though. I've seafoamed all 3 spots, (gas, oil, break booster), changed plugs, changed air filter and have done all the other work. The only thing left are the O2 sensors.