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View Full Version : Gas Mileage sucks worse than usaual



wigleym
05-23-2009, 03:17 AM
Setup: 03 Dak R/T with M1, K&N, Air Raid Throttle body, & Mopar Performance Headers.

Usually get 10 MPG but just installed new O2 sensors and sparkplugs (had too since two O2 sensers fouled out and right bank was running rich). Now getting 8 MPG.

Check engine light came on afterward since some moron did the exhaust with three O2 sensers all placed before catalytic converter (downstream O2 sensor wires were cut off before, when corrected, check engine light came on). Currently have one O2 sensor on each header and one on Y pipe after headers but before CAT. No O2 sensor after CAT. Believe stock had 4 O2 sensors.

Questions:
1. Does the 03 have 4 O2 sensors? Does it matter?
2. Will the downstream O2 sensor effect anything if its before the CAT? Not suposed too effect the PCM from what I've read.
3. Any recommedations for getting my gas mileage up?

WicKed R/T
05-23-2009, 10:21 PM
An '03 should have 4 o2 sensors. One before each cat and one after. I'd suggest getting two o2 simms for the ones behind the cat. I got mine from www.thefastman.com