VERY poor gas milage

[Shiva]

92 Festiva 1.3 fuel injection. gas mileage currently is 25 MPG.
have replaced the following. over the last year plus:
2 main computers, fuel pump, 2 sets of injectors, 1 fuel pressure relay, 3 sets of plugs, 2 of plug wires, 2 dist caps and rotors, 1 EGR valve, the TPS, the MAF. the coil, the module that feeds the coil,
adjusted the idle innumerable times, but currently will NOT go below about 1,000 RPM..
fuel filter 3 times as well, AND usually the fuel pump runs continually, as long as the key is ON.
new timing belt, and rechecked for proper time on it as well.
#2. According to the manual, shorting out the one little plug, allows you to start the car, bypassing the electronic timing advance.. and set the manual timing.. IT WILL NOT bypass.

Ideas? wiring harness problems, and if so, where?


Thanks, John

[Gforcefd]

run some seafoam through it and then repost

[Shiva]

sorry, forgot to mention that, did it as well. 2 times in fact, last time several days back. no help

[warlocke]

i dont know about festivas but i have a 95 aspire, in town im getting 25 avg mpg, may go up since i changed the fuel filter. but im happy with the mpg tho considering the mpg in other car was 7.

[Gforcefd]

warlocke that is still terrible for a aspire though. should be around 35-40. I don't know whats wrong with your car dude, if you replaced everything like you said, then it should be fine.

[warlocke]

well its an auto, i got 33.5 highway this weeked, and as i said i havent check in town mpg since i changed the filter, so well see how it goes in a week or 2

[packrat427]

sorry, forgot to mention that, did it as well. 2 times in fact, last time several days back. no help

Are you sure you have the TPS adjusted correctly .
If it is not spot on , the idle will be high ,and can cause increased fuel pressure to the injectors , which would make it use more fuel than usual .

[Shiva]

well, will check it again, but its been right, going to play with the screw adjustment on the throttle tomorrow, and then reset the TPS afterwards again.
Didn't know that had a control of the fuel pump pressure, interesting. Thanks

[mechanicaldj]

you replaced the EGR?????????????

fuel injected US model festys didn't have one,

[Shiva]

sorry, the O2 sensor in the exhaust pipe. Its been a bad week.