Question about 2003 Honda Accord

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Honda has two fault codes P0507 and P2279. This is after I repaired the fuel injection wiring that was lunch for a Rat.. Engine runs idles high and then low. suspect air leak. 2003 4 cyl. 87000 miles

The car was "fixed" by someone else, I got it to help a woman in need. Just doing what I can. The codes refer to air intake, so I guess I am looking at an air leak or ????

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  • Honda Master
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Yes I agree with the air leak theory. Code 507 actually means the computer can not bring the idle speed down using the iac valve.
Look for a vac leak between the throttle body and intake or something holding the throttle plate open.

Posted on Feb 14, 2014

  •  Stephen
    Stephen Feb 14, 2014

    I am assuming the iac is hooked up and trying to work.



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Posted on Jan 02, 2017

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SOURCE: I have a 88 honda accord with carb that i cant get to idle down

Should be an idle adjusting screw on the side of the carburator that you can adjust to move your idle down.

-Captain Jake

Posted on Feb 13, 2009

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SOURCE: 88 honda accord lxi 2.0 fuel injected (high idle)

Check for vacuum leaks, with engine at idle, go around engine and wiggle EVERY vacuum hose(especially near connections) you will probably find one that causes the issue to occur.

Posted on Apr 13, 2009

  • 3854 Answers

SOURCE: idle is too low, car dies, engine runs fine

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The car computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air.
An IAC motor is highly susceptible to carbon and coking build up; if an IAC goes too long without cleaning it can cause stalling and poor idle quality. Some cars are designed with a large vacuum transfer hose that connects the intake manifold to the IAC (idle air control) motor. If a broken or dilapidated these vacuum lines can cause the engine to lose vacuum which will allow the engine to run rough and die. 
Inspect all engine and accessory vacuum lines to look for missing, torn or dilapidated lines and replace as needed. To check the IAC motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the IAC should move in or out. 
If the IAC motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the IAC motor is removed clean (use aerosol carburetor cleaner) the passages the IAC uses to control idle air speed.

Good luck and hope this helps

Posted on May 08, 2009

  • 1 Answer

SOURCE: 95' Honda Civic 1.6 liter, will crank but wont

i have a 95 honda civic and it will crank but not start, ive heard they have a common fuel pump relay problem so i bought a new 1 and also a new fuel pump but yet still the car will not start. we i turn the key the fuel pump does not engage and am stumped. ive checked all the fuses but there all good. any ideas please help . thanks

Posted on Mar 18, 2011

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SOURCE: honda accord ex 2001 check engine light suddenly came on, car started to idle roughly

If it's running rough, chances are that it's misfiring. If the Check Engine light is flashing/blinking, it is definitely misfiring.
If that's the case, drive it as little as possible... Or straight to the mechanic because the more you drive it while it's misfiring, the higher the chance is of you ruining your catalytic converter.

I’m happy to help further over the phone at

Posted on Apr 24, 2012

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I have the codes are po171 ..po174

code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---air system---MAF/VAF sensor--fuel pressure / pump---injector/ s---HO2S
code p 0172 refers to system too rich, bank 1===causes --intake blocked ---EVAP canister purge valve --fuel pressure --EGR system---injector/s -=-- HO2S
code p 0173 refers to fuel trim(FT) bank 2--malfunction===causes --intake leak---air system--fuel pressure /pump---injector/s --EVAP canister purge valve---HO2S
code p 0174 refers to system too lean, bank 2===causes intake / exhaust leak---fuel pressure /pump---injector/s---Air system---hose connection/s
I was not sure if you wanted all codes or just the first and last, however you will see that there are some common problems that may help point you in the right direction
1-- is the heated oxygen sensor (HO2S) which is the sensor before the cat converter
2--is the fuel pressure , so a fuel pressure test will determine if a regulator or fuel pump problem,
3--EVAP canister purge valve --replace as required
4--intake / exhaust leak --check for vacuum hose failure including hoses to vent controls and check the flexible exhaust connection before the cat converter for leaks
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the MAF ( mass air flow) sensor has nothing to do with the fault
the fault is in the wiring or the IAT sensor

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code p2070 refers to intake manifold air control actuator--actuator stuck open or refers to intake manifold air control solenoid --solenoid stuck open=== causes ---wiring---intake manifold air control actuator---mechanical fault OR---wiring---intake manifold air control solenoid---mechanical fault.

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I have a 2007 ford taurus with p0300-p0303, p0306, p0316, p2195 and p2196. engine doesnt start anymore but battery is fine.

The old give me money for nothing statement from a mechanic instead of knowing how to fix it.
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code po303 refers to cylinder 3 misfire detected--- engine mechanical fault---wiring---ignition/ fuel system---injector --ECT/MAF sensor --- ECM
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