Bad gas milage

Leon proleonk at
Fri Mar 30 02:10:32 EDT 2007

Odd fuel consumption issue that I had for a while. In town, I get
approx 10MPG, not driving
hard, not spooling up the turbo too often, engine warm up or cold. On
the highway, I get approx 25+MPG going around 75mph. Usually run 91
octane from shell or chevron. Car has
approx 140k miles, all stock (doesn't have a CAT), doesn't burn oil.
Stuttering in low rpm range (1000-2400rpm) till turbo spools up,
sounds like it cutting out,
almost misfiring, but once the turbo spools up, its all good.
I believe the engine is running  way rich, some fuel odor inside the
passenger compartment
every now and then. No visible fuel leaks.
That's what I have done so far:
-recently replaced distributor
-replaced recently fuel filter
-Checked ECU - no codes
-checked spark plugs - blackish
-clean air filter
-cleaned MAF
-cleaned ISV
-new MFTS (3 connector, still intermittent operation. Speedo and fuel
gauge not working either)
-replaced temp sensor on back of head
-fuel pressure regulator - gets a good vacuum/pressure

checked air temp sensor - slightly off bentley specs
oxygen sensor - unknown, still looking for a cheaper alternative

Not quite sure what to check next. Thinking about fuel pressure, but
what after that?
As usual, any further help greatly appreciated.

More information about the 200q20v mailing list