[SOLVED] Ca Smog, Secondary air system not completing, no light, pump comes on, no backflow...

[Yukongreed]

Also ill mention I did just get a p0410 light a few night ago and it did show secondary air system check complete at the time but then had mil light on.. cleared and it ran through all the other Tests within an hour of normal driving except secondary air of course... Thanks for your help so far tho man appreciate it!

 

[Doubeleive]

Ok ran it without little vacume hose before i saw your reply and very little flow was coming through valve from pump, attached small vacume line from engine to valve and it flowed much better. Would that confirm that my solinoid is functioning to allow vacume from small line? Will try running it it for awhile it was pretty dirty around gasket inside

ya if some vacuum opens it up then it is working, cleaning it was a good idea. might not be the issue though.
what do the temperature readings show when it is warmed up? does the temp gauge go to the center?

 

[Marky Dissod]

you cant get away with that in CA any more. they can tell if codes are set to not report. and then they fail you.

Can they tell if the AIRpump enable temp has been raised to something like 239F?

 

[Scottydoggs]

Can they tell if the AIRpump enable temp has been raised to something like 239F?

dont think they could see that, what i meant by tuning around a code. there are ways to disable its function within the tune. not sure if that would set the code for it still as the pcm is still doing its self tests to become "ready" if the trucks tunes unlocked already its worth a try.

 

[Yukongreed]

ya if some vacuum opens it up then it is working, cleaning it was a good idea. might not be the issue though.
what do the temperature readings show when it is warmed up? does the temp gauge go to the center?

Always just shy of 210 other than when I was in 100 deg weather going up steep grades in Nevada/utah.

In my OBD 2 I do notice iratic swings on o2 sensor 1 60/70 down to 20 and below?

 

[Doubeleive]

Always just shy of 210 other than when I was in 100 deg weather going up steep grades in Nevada/utah.

In my OBD 2 I do notice iratic swings on o2 sensor 1 60/70 down to 20 and below?

02 sensors do fluctuate a lot depending on rpm's, etc but if it seems out of sync with the other bank.
you could try swapping bank 1 & bank 2 and see if the behavior follows the sensor or if that is just how that bank behaves.
a new one oem or delphi (what ac delco uses) is about $50 on rock auto.
I would do it cold, those cat's are no joke when hot

 

[Yukongreed]

Update: Like I mentioned I had taken it to a buddy’s shop everything checked out (no blow back at valves) finally caved took it to GM dealer had the oldest tech work on it, he said Air pump was not reading at times or something like that wanted to replace it for $800 I declined and threw a new one in.

Reset everything and every test has run except secondary air.. so damn frustrating.. what is the sensor that confirms secondary air?? Is there a sensor downstream after the check valve?

 

[Fless]

Have you looked at the diagrams at www.charm.li? See below, navigate to your year and model, and check the diagrams.

https://charm.li/GMC/2001/C%201500%20Yukon%202WD%20V8-5.3L%20VIN%20T/Repair%20and%20Diagnosis/

 

[Yukongreed]

I have not I’ll check that out thanks

 

[Doubeleive]

Update: Like I mentioned I had taken it to a buddy’s shop everything checked out (no blow back at valves) finally caved took it to GM dealer had the oldest tech work on it, he said Air pump was not reading at times or something like that wanted to replace it for $800 I declined and threw a new one in.

Reset everything and every test has run except secondary air.. so damn frustrating.. what is the sensor that confirms secondary air?? Is there a sensor downstream after the check valve?

this could be wrong info but from what I remember they said if it was not the pump it was something else in the evap back by the gas tank maybe the evap which sort of makes sense but you would think there would be a separate code.
mine would throw a code for it super random at higher elevation and only when it was pretty cold out, so basically it would only do it if I was out state visiting family like once and then it wouldn't do it again until months later

 

[West 1]

For anything EVAP related a smoke check finds many issues quickly. Rules out leaks in the system. I had one leaking right out the side of the EVAP canister.

CA does check and looks to see if the truck is running the GM factory program at smog checks. It reports to the smog tech any changes or updates done to the factory tune.

Having Hot Rods was a lot more fun before smog checks came along.

 

[swathdiver]

Just a little bit longer and you guys won't have to deal with CARB or emissions inspections anymore.

 

[Fless]

Just a little bit longer and you guys won't have to deal with CARB or emissions inspections anymore.

I'm not sure about that. Colorado has State laws that require the emissions tests, although that requirement was likely prompted by EPA air quality issues along the Front Range. And the legislature is highly resistant to giving up the nanny role.

 

[Yukongreed]

I'm not sure about that. Colorado has State laws that require the emissions tests, although that requirement was likely prompted by EPA air quality issues along the Front Range. And the legislature is highly resistant to giving up the nanny role.

Dove into the link theres a lot of information in there! Did the I/M AIR System Set Procedure and still would not complete test, and dosnt throw a damn code!? in the past its thrown the p0410 but its so random and could be after 10k + miles and operation..

One bit in there says: If the diagnostic test does not run, observe the fuel trim correction. If the fuel trim correction is more than plus or minus 4 percent, the AIR System Test may not run. If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.

Im not sure if my OBD tool reads fuel trim, what should fuel trim be?

What about throwing a new pump relay at it? i guess at this point i just need to start throwing parts at it.. those check valves seem like a real pain to get off.. buddy said theres no blow back but they could be clogged on other side?

For the drive cycle it wants AC and rear defroster on for the 2.5 min idle warmup is that just for load? My AC is not blowing cold currently needs recharge

 

[Marky Dissod]

If the diagnostic test does not run, observe the fuel trim correction.
If the fuel trim correction is more than plus or minus 4 percent, the AIR System Test may not run.
If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.

Clean that MAF sensor (gently delicately & carefully!), then seriously consider checking for any (vacuum) leaks between the MAF & O2 sensors.

 

[swathdiver]

I'm not sure about that. Colorado has State laws that require the emissions tests, although that requirement was likely prompted by EPA air quality issues along the Front Range. And the legislature is highly resistant to giving up the nanny role.

That's gone too. They have no authority to test for emissions from automobiles anymore. My caveat is that I don't know when these things take effect exactly, could be a month from now or a few more, don't remember. So some folks are going to be jammed up until the states are forced to abandon testing. I reckon that some will ignore federal law like they always do and have to have the Supreme Court tell them to knock it off.

 

[Fless]

So some folks are going to be jammed up until the states are forced to abandon testing. I reckon that some will ignore federal law like they always do and have to have the Supreme Court tell them to knock it off.

Authority or not, it's highly likely that this State will continue to require testing, until such time that a lawsuit is successful. There's quite a large infrastructure for the emissions testing and a lot of money is made.

 

[Marky Dissod]

Thing the 1st

10th Amendment:
"The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."

Too bad I'm not a lawyer / don't speak legalese ...

Thing the 2nd
The EPA should reimburse people for installing lowered suspensions that make it sufficiently difficult for thieves to steal catalytic converters.

 

[swathdiver]

Authority or not, it's highly likely that this State will continue to require testing, until such time that a lawsuit is successful. There's quite a large infrastructure for the emissions testing and a lot of money is made.

The problem is, with emissions standards gone, what are they testing for? But I get what you're saying, they ain't going down without a fight. But go down they will.

 

[Yukongreed]

I got my secondary air monitor to pass! It ended up being the check valves were clogged! I ended up just throwing the parts at it because I suspected they were I knew my pump was working and blowing strong because I ordered a new one and it blew less air!

Valves are ~$25 each on Amazon or parts geek!

They were difficult to get off pretty seized had to continually hit them with break free lube on separate attempts just make sure you have the right tools a 1” and a 7/8 wrench. You’ve got to position yourself to get the two opposing forces to get torque and break them free without busting the down tube to header.

What a pain from a OG tech at the Chevy dealership telling me I needed a new air pump, no check engine light for info one shop had pulled the hoses to check the valves but didn’t find any debris, buildup or moisture behind them so thought they were good..

If you know your pump is good it’s worth pulling the check valves just to make sure they’re clear (if you can’t blow through them they’re toast) after 150k there’s bound to be buildup! Don’t forget to confirms small vacuum hoses are good!