Question about 2003 Honda Civic
2003 civic (ill answer for engine, not dragging brakes, or seized wheel bearings etc)
GOT THE check engine lamp out, driving.? NO bad. scan it.
get it scanned yet to see if there are DTCs stored?
we scan regardless of any CEL status.
what id do, is get my own real scan tool for like $9 (ask)
and scan it.
then see if it holds Closed Loop status hot. if not?, fix that first.
if it holds CL at idle hot, then i check 40mph light flat cruise.
holds CL. (closed loop) if not IT WILL SUCK gas.
ever put a new cam belt on this engine. if not bending all the valves in the head is next. $1500 bill. or more.
never skip the cam belt.
i bet your engine is not working in CL, at all.
i discover that, and then work that problem , idle CL failure is the
most easy to work, its parked.
1: i check compression over 150PSI x4 and done at WOT, wide open throttle (pass or fail)
2: i check spark at all spark plugs , 03 timing is fixed.
3: now i check fueling,
i look at my live data from my scan tool and see that all senors read right but my front 02 sensors is rich all the time.
i check fuel pressure, its at spec,(35?psi) not 60 no 10, not 20
i do the injector leak down and balance test in the FSM.
it fails. i fix that.
it passes. i now put in a new front 02 sensor. bingo fixed.
Think of CL as MPG, NO CL , NO MPG
CL is is also called Stoich, and is the max ifficency point of the fuel air mix.
Posted on Jan 01, 2014
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Posted on Jan 02, 2017
SOURCE: High fuel consumption
Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.
Alex (Civic 2003 1.7 manual)
Posted on Sep 06, 2008
transmission slipping dragging brakes.timing off worn timing belt .bad spark plugs + wires +coil.defected valves and worn cam shaft.use scanner to check oxygen sensor. run engine 5 minutes look at scanner . should read closed loop . if read open loop replace oxygen sensor.
Posted on Apr 03, 2009
Checked brakes for possible wheel(s) dragging, as well as tire pressures up to max recommended pressure, and observe if tire wear unusual, signifying improper alignment? Any difference in engine oil grade used?
Posted on May 13, 2009
SOURCE: My car Honda City done
Oil Change, Air Filter replacement, coolant check, tranny filter change, rotate tires and check pressures, and cabin air filter are among the more important ones to consider along with having the brakes and rotors checked and machined if required.
Posted on Mar 14, 2011
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