Hi all,
I'm trying to diagnose what's wrong with my BIL's 05 Honda Accord 2.4L with 230,xxx miles. Scanned two codes - P0496 & P0507.
Little backstory: According to my BIL, after refueling the car, it would take maybe 2-3 tries for it to work. He also mentioned the car turned off on him while exiting the freeway exiting off on a ramp. He also mentioned it helped when he pressed the gas while starting the car after refueling/after that incident.
Read up online that P0496 pertains to some fault in the EVAP system in which a lot of Honda Accord forums point the finger towards a faulty purge valve solenoid being stuck open or some type of issue with the hose/connections, so I went ahead to go check on it.
P0507 seems to address Idle control system RPM higher than expected
I've done the following so far:
- Clean Throttle Body & MAF (According to my BIL, it ran a bit smoother, but problems still persist)
- Removed the purge valve solenoid and tried blowing on it to see if it was maybe stuck open (it was closed, and I could not blow air through it)
- Checked the electrical connector to see if it was sending power to the purge valve solenoid (there's power and wires were not frayed or anything)
- Hooked up a smoke machine through the purge valve hose going into the engine. There was smoke coming out of the air intake housing (where the clips hold down the air filter). Aside from smoke coming out of the air intake housing, there were no other leaks I could identify. This is while the car was off. I'm assuming that's not supposed to happen.
I'm not sure if it's wrong to think that maybe the fuel injectors are clogged, so that's why the purge valve is throwing a code in which the engine is not able to get a good enough fuel mixture or if that leak around the air intake is the culprit by pulling too much air into the system.
Any advice on how I should approach this issue highly appreciated. TIA!
Best regards,
Lofi
Well the first thing I would do is erase the codes with a scan tool. Then I would road test it and when the check engine light came on I would see what code existed first and work on that system. You have to see if you have a big enough vacuum week that it will actually cause problems a lot of times that doesn't affect the running of the car at all. And I would definitely run a smoke test on the intake manifold. You might easily have a leak somewhere because that will make the car idle too high sucking air
@scottykilmer Thank you scotty.
In addition to the problem, would a leaking valve cover also have some sort of part in this? I figure it would suck in more air. TIA!
@just-lofi valve covers don't suck air. If anything they blow.
I see thank you.