What can i tune up on my 944?

[pearljaman31]

I think my car needs a major tuneup. Im currently getting 17mpg, using premium gas and driving it softly. Maybe 4 months ago i replaced the air, oil and fuel filters. Recently i put in new spark plugs and transaxle fluid. What else can i do to fix my sick car? Its an 83' with about 70k miles.

I purchased it in fef of 05' and it had been sitting for awhile. But ive been using it as a daily driver since i bought it, and have put about 5k miles on it.

[Techno Duck]

Ignition Wires
Distributor Cap
Ignition Rotor
Fuel Pressure Regulator (only if your car is running rich)
O2 Sensor
Vacuum lines

[CJFusco]

Okay. First of all "Premium" is just a marketing ploy by the gas companies. The octane of gas has nothing to do with quality. The octane refers to knock rate -- the only reason you should run 93 octane gas if your car doesn't call for it (I believe 87 octane is fine for a stock 944) is if you are getting knocking/pinging from the engine at high revs. Otherwise you are just throwing money away.

The standard tune-up is cap, rotor, plugs, oil, and filters. Ignition wires might be needed if yours are old and worn.

Test the 02 sensor; unplug it and see if the car runs better with it unplugged. Is the car running rich (gas smell even at idle)?