Replace Purge, Pcv, Canister Close Valves. Perform Fuel Injection Service. - Hyundai Forums : Hyundai Forum

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Old 07-02-2009, 07:44 PM   #1 (permalink)
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bandwar
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2001 Elantra GLS, ~68,000 miles.

The CEL came on about 4 weeks ago while driving with full tank, found evap code at Autozone, tightened the gas cap, and cleared the code. It came back on again after 2 days (drive cycle), and remained on for few more days when it cleared itself up when the gas level dropped close to empty. Filled the gas just over half tank full, and the CEL did not come on for few days (during which the car passed the state inspection too - no codes found !!, gas cap passed pressure test too). Filled again the same amount and the CEL came back on second day. Took the car to a local dealer for a free diagnostic check and multi-point inspection (with coupon) that found several codes (dealer did not say which ones), and recommended to replace Purge, PCV and Canister close valves for $350. They also found throttle body to be dirty upon inspecting the fuel injection system and also recommended to perform Fuel injection service and cleaning the throttle body for $140 (total $490 + tax). Got estimates of $325 - $350 (+ tax) from neighborhood mechanics for the same services.

The car seems to be running normally even with the CEL on, except that it hard starts first time in the morning only (takes 2 attempts, and the dealer said it does not need tune up). Added Supertech Fuel Injector Cleaner additive last two gas fills.
My questions are:
1. Is it important to perform these services now ?
2. Is $150 difference (approx.) worth the services at the dealer?

I'd appreciate some quick responses.
Thank you.
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Old 07-02-2009, 08:08 PM   #2 (permalink)
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Ok, the whole purge valve, canister, canister valve thing is all BS. You caused it by overfilling the tank. What happens is you put too much gas in it, it floods the canister, the little bits of charcoal float up and clog the evap system, the purge valve, the canister valve, etc. Yes, they can fix it by replacing all that junk, but it will cost a fortune. You didn't say they would replace your canister, only the valve. That's no good because the canister is the part that has failed.

Just remember that your evap system being FUBAR like that has no effect whatsoever on your fuel economy or performance. .The problem it makes it hard to pass emissions, which you apparently have overcome.

You didn't say what codes you got at AutoZone. It's important to know that, so you can do the cheap fix. Sounds like they take you for a "mark".

I wouldn't bother with the "intake clean" or the "fuel injection clean" unless your getting codes for fuel injection problems, or you're getting bad fuel economy. Your dealer sounds like they want to make some quick bucks.

You got 68K miles. Did you change the timing belt?
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Old 07-03-2009, 12:42 PM   #3 (permalink)
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jsinton, thanks for your quick response.

The dealer recommended replacing only the valves, not the canister. I forgot to mention, they also found some engine oil leak, and recommended to replace the valve cover gasket under the powertrain warranty, which I plan to get done from them.

The initial code at Autozone was P0440 that cleared itself when the gas level was near empty, and I passed the emissions. I don't need to worry about it for two years, but the CEL is on now and I will try to get the codes again from Autozone today. What type of cheap fixes can be done?

The fuel economy is mediocre (18-20 mpg), and I guess its mostly due to my city only driving. I drive 5 miles to work one way, with 15 traffic lights, that's a lot of stop and go during my daily commute ! I use Supertech Gas treatment and Fuel injector cleaners every alternate gas fills, and fill only just above half the tank.

I changed the timing belt at 60K last year.

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Old 07-03-2009, 03:27 PM   #4 (permalink)
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P0440 is a generic code, it doesn't mean a whole lot. It doesn't really track down the problem. Probably replacing the canister valve and the purge valve will clear the code, but no guarantees:

A code P0440 could mean one or more of the following has happened:

* The gas cap is not installed or working properly
* The purge solenoid has failed
* The canister is plugged and not working properly

Possible Solutions

With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

* Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
* Inspect the EVAP system for cuts/holes in tubes/hoses
* Inspect for damaged or disconnected hoses around the Evap purge solenoid
* Check and/or replace the sensor
* Check and/or replace the purge valve
* Have a professional use a smoke machine to detect leaks
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Old 07-03-2009, 05:04 PM   #5 (permalink)
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I got the same code at Autozone today.

I think the gas cap can be ruled out at this time, because it passed the pressure test at inspection when the CEL was off, and I make sure to tighten it (atleast 3 clicks) myself every time I fill gas. But, I can try it again (remove, reinstall, clear code, drive, etc) and see if the CEL comes back on again. If it does, I will consider replacing the purge and canister valves.

I believe when the dealer performed diagnostics and multi-point, they inspected the EVAP system and all hoses before recommending replacing purge, canister and PCV valves. This brings me to my original question: Is it worth the service at the dealer or should I get it done at the cheapest mechanic ? The max discount I can get from the dealer is 10%. If the difference is not much (like $50-75), I think I will get it done at the dealer just to have a little peace of mind. I am going there anyway to get the valve cover gasket replaced under the powertrain warranty.
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