It's possible--but unlikely--that the gas cap is to blame. Check the rubber
seal on the cap. Is it free of tears and burrs? Then the gas cap is likely
Sorry, but you'll need to inspect (correctly) all the solenoids that
control your EVAP system. These are under the car, at the rear near the gas
tank. So situated, they are horribly susceptible to corrosion. Do you know
what the word "corrosion" means? Apparently Honda didn't; they seem to
think everybody lives in Torrance.
I have a number of Honda docs here:
that have to do with EVAP diagnosis and cure.
My advice? If you do not have an emissions test you'll need to pass, just
live with the problem. EVAP errors do no harm whatsoever to the car, but
can do lots to your wallet.
But if you like gambling, you can change the cap anyway (with new OEM) and
hope for the best.
well, replacing the solenoids as you've advised people to do in the
past, is not a gamble - it's a waste of money.
the problem is the gas cap, and i have this problem on my own accord.
especially in warmer weather when there's more expansion, the tank vents
and loses pressure. that is registered by the sensor and a code is set.
if you get a new cap, or just vaseline and push harder on the old one
so the thing seals properly before it clicks, the tank seals, holds
pressure, and there's no code.
just to illustrate the point, after my own initial code light issues, i
started making sure i was tightening the cap properly, and it has stayed
off. i then loan my car to a friend, and he calls me a week later
saying the code light was on. i tell him about the cap, he starts
tightening it properly, and the code clears after the requisite number
of drive cycles.
that's $120 you don't need to lash out on a new purge solenoid.
I /never/ advise replacing the solenoids. I advise the performing of proper
diagnostics prior to spending money on parts.
Not everybody lives in the southwest, you know.
In the northeast (where the OP apparently resides) Honda has had very
significant and serious problems with corrosion on the EVAP canister and
its solenoids. The problems have been bad enough to result in a large
number of TSBs and SN articles on what causes the problems and how to
troubleshoot them. I've posted many of them on my site.
It's true that an insufficiently-tightened gas cap can cause certain EVAP
errors, so the OP would be wise to both inspect the cap's seal (as I
suggested), and to ensure that it be tightened at /least/ six or eight
clicks each time it is put back. It is also unwise to use aftermarket gas
caps, as they are not as well-made as OEM caps, and cause EVAP codes much
more frequently than OEM caps.
the canister is polyethylene - i don't think that even in canadia,
corrosion has ever been recorded as a problem with that material. the
solenoids, well, if they are corroding, they're mysteriously passing the
vacuum meter test.
you're not speaking from experience dude. the $10 stant 10834 gas gap i
got to replace the oem on my accord is every bit as good as oem, and
better in that it has an improved seal gasket design. and the number of
clicks isn't going to make any difference if the seal's not seating
properly (ignoring of course that you're pulling those numbers out of
thin air - the manual says three).
the telltale is that if you go to test after the code has been set, the
gas cap will be "loose", i.e. that even though it seemed tight after you
filled the tank, it'll now almost fall off in your hand.
the unfortunate shop diagnostic process that would include a pressure
test of the cap off the tank, gives a false conclusion because the cap
always works on the testing machine. this is probably why honda
concluded there's a problem with the solenoids since it seems that the
cap checks ok. just like honda think there's a problem with civic
thermostats when in fact it's the transmission selector switches, and
you get a fuel injector code when the main relay's not working.
when i had mine smog tested, the last item on the check list is the gas
cap. it tested fine and the car passed smog. driving home from the
smog station however, a code set because the tester only put the cap
back on with "weak" torque so it was loose and then vented again.
the solution is to get a new (aftermarket) cap, then make double sure by
running a little vaseline around the seal, and push a little when
screwing back on. end of problem.
so, getting back to your question, yes i do doubt honda's service
bulletin. [note: the words "very extensive documentation", would in any
normal engineering parlance mean "fault examination and diagnosis".
that is /not/ what they've provided.] this service bulletin, just like
most of the others, is written by a workshop tech here in the u.s., with
a view to getting the thing out of the shop and out of warranty, not
hondas design engineers in japan figuring out what the design/spec/q.c.
issue was so they can correct it in future manufacturing. and just like
service techs for many other situations and many other types of machine,
service training is not always the best analytical training so
misdiagnosis and mistakes result.
they don't need to pay me - i've already done the ones you snipped for
besides, it's disingenuous to try to imply that i'm saying all their
service bulletins are misdiagnoses - they're not. but when they /do/
make mistakes however, there's nothing wrong with saying so, and why.
just like i'll say it makes no sense when people advocate 3k mile oil
changes regardless of the scientific facts or the owners manual.
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