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#4559705 - 10/30/17 09:23 PM my car fixed itself..
bowlofturtle Offline


Registered: 06/25/09
Posts: 761
Loc: Chicago
Ha! Gave me a great laugh today.

The infiniti in my sig is my daily. Back in May I had a CEL for small evap leak. I would clear it and it would come back like clockwork. I checked the basics up top, fuel cap sealing decent and evap purge solenoid activated when i gave it 12v. I cleared it and it would come back, flash forward to July when i actually had time to crawl under and get to the canister and 2 other valves, applied voltage and heard them click. I was out of ideas without a smoke machine.

Early this month i noticed the CEL finally turned off, i figured it one of those trip cycles things but its stored in pending/memory. Pulled out my scanner today because i had time, WOW no codes in stored or pending. No codes what so ever. Its like the fault never happened. I checked the readiness monitors, all are green. Obviously i'm happy, i never thought the fault would completely clear itself.

I honestly believe the fault to be gas cap related as thats the only thing that could have been tweaked every fill up. I expect this code to come back at one point. My car is a rust belt car, i wouldn't be surprised if something rusted out.
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#4559713 - 10/30/17 09:39 PM Re: my car fixed itself.. [Re: bowlofturtle]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
You should try laying hands on another car with a mysterious problem. If that fixes it you might have a new calling. Did turtle soup give you special powers?

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#4559724 - 10/30/17 09:52 PM Re: my car fixed itself.. [Re: OneEyeJack]
bowlofturtle Offline


Registered: 06/25/09
Posts: 761
Loc: Chicago
Originally Posted By: OneEyeJack
You should try laying hands on another car with a mysterious problem. If that fixes it you might have a new calling. Did turtle soup give you special powers?


The soup might have, or a strange yearning for pizza.
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#4559732 - 10/30/17 10:06 PM Re: my car fixed itself.. [Re: bowlofturtle]
spasm3 Offline


Registered: 05/30/10
Posts: 8652
Loc: North Carolina
Evaps can be a pain, the cap unless new is always suspect in my book. Can depend on temp, fuel level etc. I'd start with the cap.
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#4559770 - 10/31/17 12:20 AM Re: my car fixed itself.. [Re: bowlofturtle]
BrocLuno Online   content


Registered: 09/06/15
Posts: 5518
Loc: Kalifornia Kollective
Any overfills will put you in harms way. Running with 7/8's down to 1/4 tank and not over filling will clear eventually. Could have been nozzle at station ... Maybe filled at different station and not quite so full ...
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#4559783 - 10/31/17 02:05 AM Re: my car fixed itself.. [Re: bowlofturtle]
Char Baby Offline


Registered: 05/25/05
Posts: 10022
Loc: ROCHESTER, NY
Originally Posted By: bowlofturtle
Ha! Gave me a great laugh today.

I honestly believe the fault to be gas cap related as that's the only thing that could have been tweaked every fill up. I expect this code to come back at one point. My car is a rust belt car, I wouldn't be surprised if something rusted out.


Often it is rusted out lines from either side the fuel filler tube going into the tank or the tube itself. Remove the wheel well liner on the filler side and check their condition.
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#4559801 - 10/31/17 04:31 AM Re: my car fixed itself.. [Re: spasm3]
Silverado12 Online   content


Registered: 02/26/13
Posts: 3114
Loc: Central Virginia
Originally Posted By: spasm3
Evaps can be a pain, the cap unless new is always suspect in my book. Can depend on temp, fuel level etc. I'd start with the cap.


From my experience the issue has never been the cap; it's usually a vacuum line or bad purge or vent valve.
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#4560031 - 10/31/17 10:06 AM Re: my car fixed itself.. [Re: Silverado12]
Duffyjr Offline


Registered: 01/13/16
Posts: 506
Loc: Nebraska
I think you're right thinking it is/was the cap. My Buick was doing this and mech told me to clean the cap and nozzle real good, hasn't come back on yet.
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#4560757 - 10/31/17 11:37 PM Re: my car fixed itself.. [Re: Silverado12]
bowlofturtle Offline


Registered: 06/25/09
Posts: 761
Loc: Chicago
Originally Posted By: Silverado12
Originally Posted By: spasm3
Evaps can be a pain, the cap unless new is always suspect in my book. Can depend on temp, fuel level etc. I'd start with the cap.


From my experience the issue has never been the cap; it's usually a vacuum line or bad purge or vent valve.


Same with me. I've replace more purge or vent valves than anything else when i see evap codes. The other cars i've seen were obvious damage of the charcoal canister. Never had I seen a gas cap fix an evap problem.

In my head it makes sense that it could be the cap, i've always made sure its on with a good seal. I actually had a feeling right after i posted it, the CEL would be back... still waiting.
_________________________
My toys
-05 Infiniti G35x 121k
-03 Suzuki SV650N 8.5k
Maintaining
-16 Jetta 1.4T 7k
-98 Nissan Maxima 145k
-09 Toyota Camry V6 86k


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#4560978 - 11/01/17 08:26 AM Re: my car fixed itself.. [Re: spasm3]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: spasm3
Evaps can be a pain, the cap unless new is always suspect in my book. Can depend on temp, fuel level etc. I'd start with the cap.


I have repaired hundreds and hundreds of evap leaks. Only once was it the cap. It is actually more common to have a damaged filler neck from a rodent chewing through it.


Edited by mightymousetech (11/01/17 08:27 AM)
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