If when you poured the sea foam in the tank some went in the vent hole that would do it.

 

Sorry for the noob question but what do you mean by vent hole?

 

When you replaced the "evap canister", (the large black rectangular box), did you also replace the round component, the Evap Canister Vent Solenoid Valve? If that has been replaced, the problem could be a leaking Fuel Tank Pressure Sensor, on top of the tank. You have a Crew Cab, so replacing that will require dropping the tank.

 

When I replaced the fuel pump on my S10 I just used a cheap pulley system hung on rafters to raise the bed. Can you not do this on crew cab colorados/canyons?

 

Ah sorry, I actually replaced the evap canister vent solenoid valve (round component) but I did not replace the charcoal black box (evap canister). Replacing the fuel tank pressure sensor doesn't sound like a fun job if I have to drop the whole gas tank. Is there a way to test the fuel pressure sensor and the evap canister? I've checked the hoses and can't seem to find any leaks or cuts in the hoses.

 

Other than smoke testing the system, I don't know of a way to check the tank pressure sensor. Someone with more experience with the system might know of a way. When you replaced the Vent Solenoid, did you reuse the hose or replace it? Small leaks can be a real headache to troubleshoot.

 

Instead of paying hundreds in parts... spend 100 to get it properly diagnosed.

 

^^^Agree^^^

Take it into one of the economy chain repair shops (e.g. Tuffy's, Firestone, etc.) and have them fog/smoke your emissions system...they'll find the source and then it's time to elect repair/fix options. Otherwise you can play "find a leak" all day long w/no results.

 

thanks guys! I'm definitely thinking of taking it to my mechanic and see what's up. I'll post back when I get the results and hopefully this will help somebody else.

 

I did it to and threw a cel of a lean in bank 1 i think it was.. It's normal if u sea foamed a heavy dose .. Just rest cel and go


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This is why I refuse to use seafoam. There are nothing but bad stories of people using it. I use Amsoil P.i. Performance Improver. It's specifically engineered for automobiles, unlike seafoam which started as a small engine cleaner. Amsoil P.i. Is designed to work heavily clean carbon build up and reduce emissions while being gentile on solenoids, gaskets, rubber o-rings, ext. It also improves fuel economy up to 5.7%.


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I swear by BG products.

 

I've used Seafoam for many years and had no issues with my 01 ranger with 200,000KM on it but that truck was babied and well taken care of.

The colorado that I have now was not taken care of and was kind of left to rot. It only has 125,000KM on it but I don't think there was any maintenance done on it so putting the seafoam through it probably cleaned it out a lot which in turn set off the engine light. If it ain't broke don't fix it right? Maybe shouldn't have done the seafoam treatment..... Oh well

 

I'm pretty convinced that it's a coincidence. A splash of fuel treatment in one tank of gas really shouldn't give you a code, especially the code you had returned.

If you over dosed the tank then perhaps you were getting a bad burn, however even if you added a whole can to a half tank I can't see it throwing a code.

Think about what the gas does.....flows through a fuel line (nothing in the fuel line to throw a code), passes through the fuel rail and injectors. The seafoam will can't harm the injector as far as I know. If it had you'd get a misfire, or one would expect. Next, the fuel/chemical is burned and discarded through the exhaust.

Even if a person gets 'bad gas' from the pump, it self clears.
Remember, you're throwing a code for the evap system.
Maybe I'm missing something but I just can't understand how the treatment has any affect whatsoever on the evap system.

I'll throw a code when I use the spray treatment through my intake, however I'm flooding the motor and it's misfiring - good reason for a code. It clears once I complete the job. And the two procedures are not comparable.

I skimmed through the posts again (not entirely reading it) and don't see if you reset the battery and/or have had the code cleared only to have it return.

 

yeah I think it's a coincidence really as I've never had any issues with Seafoam. I only put 1/4 of a can into the gas tank so I didn't flood it at all. I've cleared the code multiple times and it comes back after a day or so. Again, when I get the time I'll bring it into the shop and see what's up. I'll definitely post back the results just might not be for a while.

 

If you added only a 1/4 can to the tank, I see no way for that to be the cause. if you used a vacuum line to suck it into the intake and hydro locked it, that could be the problem. It is a coincidence.

 

Right after I got my truck in 2012, I used a can of seafoam about every other fill-up for a bit . . . about 4 cans worth. Never had an issue with it. Now, whenever it seems like the idle is rough I'll toss a can in.

I agree with others here that it is probably a coincidence. It will be interesting to see what the final diagnosis is.