philco_3

Ok, my 05 SC/SS threw a code on me Thurday, went to get it checked out, said it was a Evaporative Emission something or other. They cleared it, drove it around and it didnt come back on. Well that f'n code came back this morning. Its gonna go in Wednesday morning to have them take a better look, and I was wondering if anybody else had experienced this code also? Nothing is done to the car its bone stock.

TimDang

I haven't seen anything like this on the boards yet, so I dunno. Sounds like they need to smoke test it and see where it's leakin at. I don't see how an evap leak could be exhaust related though...

R33P3R007

HUH?

Darksun

What was the exscat code # number thrown becasue im throwing a po420 one right now and i have black smoke coming outta my exhaust everytime i go full throttle or up/down shift.

philco_3

I ask the service guy what it was and he it was the Evaporative Emission (EVAP) Vent something. He played around with the tech-2 and I heard him open and close the vent. I just hope it wasn't something stupid I did with it one night, thats gonna cost me out the ass.

ExHondaMan

If its a code for the evap emissions then it is regarding the fuel tank/charcoal canister ... nothing to do with the exhaust in any way.

If he was opening and closing a valve it was either the purge valve (valve that allows engine to pull fuel tank into a vacuum for test purposes) or the shutoff valve (valve that seals off the tank from the atmosphere... )

philco_3

hmmm

ExHondaMan

I didnt read the entire document but the first diagram seems to be a pretty decent generic depiction of how an evap emissions system is setup. At benz when we test an evap emissions leak (what typically sets a fault code)... we close the shutoff valve ( to close off the system from the atmosphere) and fill the system with a smoke machine. Locate where the smoke is leaking at and repair. Although all setups are not exactly the same. Im not sure how a chevy or gm product is setup... but I would imagine it is similar

philco_3

I'll find out the deal is with it is on Wednesday. I just hope its a problem that falls under the warranty, and not out of my pocket, cause thats all I need is another bill to pay.

ExHondaMan

It will be a warranty item. Nothing in an evap system can be considered a wear item (IE brake pads, clutch etc). Besides if its throwing a code for evap emissions... it shouldn't pass an emissions test... thats normally always a pretty big deal.. I think its law (maybe be a state by state thing but may be federal) that emissions controls such as those must be covered. Let us know what they find... I would be a little patient with them as far as the time it takes to diag... Ive had a few evap leaks personally that have been pretty time consuming ! good luck

philco_3

If its down for a while I hope I get a rental to "drive"

ExHondaMan

Hhhhmmm.... Ever Auto-X'd a base cobalt sedan ?

philco_3

no my luck its gonna be a base 4 dr cavalier that gonna be auto crossed...

Spite4U

Did you try tightening your gas cap? This used to throw an evap code on my Nissan.
good luck!

philco_3

Yah thats what my dad said, but its on there nice and tight.

philco_3

FIXED

Cause: Updated Programming
J6354 Engine Control Module Reprogramming

bluebillit

i've allready replaced the muffeler because the baffels blew out of it and now the cat is going.apparently i'm not the only one with this problem i know 4 other SS owners that r having the same problem is there a recall for these things or is this a isolated problem confined to maple ont??

Darksun

Same thing happend to me. The dealer said the part won't be able to be orderd for two days or up to 2 weeks.Tthere trying to order me a whole system from the down pipi back.

philco_3

well after I thought that my dealer fixed my problem guess what...thats right my friend the check engine light came on. Now they are gonna order me a new gas cap to fix the problem. If this doesnt fix it, I'm taking a week off, driving to lordstown and going to have them fix my crap.

ExHondaMan

That sucks.... Didnt they test your evap system the last time... wtf ?

NJBLUESS

Philco 3, I feel your pain, but try to be pateint. I know EVAP problems, especially small leaks, can be tough to find. It is also a possibility the tech working on it hasn't got a clue. You do have an option to take it to another Dealer or even request to the Service Manager to have a different Tech look at it. I hope it works out for you, and yes EVAP problems are covered, they're emissions related.

philco_3

yah thats what I'm going to do here in a hour or two. They installed my new gas cap, and the light is still on. But I did notice when I filled up just after some shopping that while I was at the pump it would click off like it was full, which it wasnt. Patience is wearing out, I'm trading her in for a Vette

NJBLUESS

If the car is not exepting fuel, clicking off the nozzle and you have EVAP codes, sounds like the Vent Soleniod is not opening up. Or you have the engine running during fill-up, (you don't,do you?) If the vent soleniod does not open pressure can not expelled from the tank and will trip the "shut-off". I will ckeck for bulletins.

EDIT; Just checked bulletins; Document ID # 1727673, DTC p0446 (EVAP code), tank hard to refuel. Cause is possible restriction in Vent Tube,(thats what the Vent Soleniod opens to) Show this to the Service Advisor, it should help.

philco_3

yup that was it, said it was clogged. no more check engine light.