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Old 04-05-2017, 08:33 PM   #1
Pegasus83
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Default Secondary Air Injection Vacuum Control Solenoid Valve

Greetings. I have a 2002 SL1 SOHC. Cannot pass NYS inspection due to P0410 code. I followed the richpin video. Replaced the smog pump & the switch. Clean all the way to the exhaust manifold. But it has come to my attention that the Secondary Air Injection Vacuum Control Solenoid Valve is missing the round black thing that looks like the cap from a can of brake cleaner. I cannot find this part number anywhere & the only part number I'm getting is ACDelco's 214-1057 but that is NOT compatible. Can someone please, please help me? I'm at the very end of my rope. Thanks so much.
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Old 04-05-2017, 09:46 PM   #2
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Now I am starting to think the part number is 2121-0001. This could make sense since the diverter itself is 2121-0000.

I've found a bunch of GM parts website, most of them are using the same search software & most are coming up with the same part/# but no image so I can't be sure. However, there are two more websites using this part number for the actual diverter, not the solenoid....and again, no images. I don't trust any of them but I trust you guys. I mean, this forum helped me believe, understand, convince others, and then finally resolve the whole "camshaft position sensor" problem.

I really need help with this. I'm way overdue on my inspection & my car IS my livelihood. It's only a matter of time before I get bagged by the cops & then I would lose my job. Please help??? Thanks.
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Old 04-05-2017, 09:57 PM   #3
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

I am unsure of the part #, but here's one on E-bay:

http://www.ebay.com/itm/2001-2002-sa...xYpglt&vxp=mtr

It comes with the valve.

I'll check my Alldata account to see if they have a P/N.
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Old 04-05-2017, 10:04 PM   #4
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Thanks Bachands! I found another thread where OldNuc says the part number is indeed 2121-0001.

I'm not allowed to post links to other sites & this is a similar thread on this same site. I'm removing the first part of the URL just leaving the rest. I think you guys can find it.

/forums/showthread.php?t=229607

This thread can be locked or deleted. I hadn't seen the other thread when I posted. Thanks again. I'm gonna contact that seller to ascertain if it works. There's nothing in the description.

Last edited by Pegasus83; 04-05-2017 at 10:07 PM. Reason: Adding link to similar thread on this forum
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Old 04-05-2017, 10:35 PM   #5
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Identification of parts.
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Old 01-15-2021, 01:08 PM   #6
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

sorry to dig up an old thread

im in the same boat with replacing this switch. everything i find says CALIF EMIS LEV(NC1), Fed EMIS NLEV(NF7)

https://www.ebay.com/itm/Secondary-A...bab2%7Ciid%3A1

is this part still gonna be compatible with my Michigan based car?

all the other details fit my car but that CALIF EMIS worries me
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Old 01-17-2021, 02:45 AM   #7
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Err, I'm not too knowledgeable about this system, but...

I Think the only difference between Cali vs Federal emissions would
concern the CatCon behind the flex on the downpipe -- it has more
precious metals to purify the Ex stream.
[the O2 sensor circuitry may also be more sensitive??]

The manifold-mounted 'precat' serves Only to pre-heat the main
CatCon on coldstart. OldNuc examined the operation with an
infrared thermometer, and found it quickly becomes 'incandescent'
hot right after starting, and then shuts down.

So, the valve you seek to replace would have the same function
for either Fed or Cali emissions vehicle --- either CatCon needs preheat.

I think I may have bought one from RockAuto. I later discovered it was working. The Relay in UHJB turns the valve on, i think.

In my case, the first failure/intermittency in the SAIS was due to
poor contact/connection in the forward/psgr Ground Splice Pak on the
frame member behind headlamp that the air pump grounds to.

The second failure/intermittency in SAIS was due to extra resistance
at relay contact blades in UHJB, which was rectified by removing/reseating the relay into UHJB. I later installed a new relay (I'm cheap, but feel generous about any component which endures >150kMi, or 15 years service)!

Last edited by TomM96; 01-17-2021 at 02:48 AM. Reason: fergat un
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Old 01-17-2021, 10:28 AM   #8
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Quote:
Originally Posted by TomM96 View Post
OldNuc examined the operation with an
infrared thermometer, and found it quickly becomes 'incandescent'
hot right after starting, and then shuts down.
How can it shut down?
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Old 01-17-2021, 11:04 AM   #9
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

I presume it stops getting air injected and cools down
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Old 01-17-2021, 12:20 PM   #10
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

Quote:
Originally Posted by me.theuser View Post
I presume it stops getting air injected and cools down
Ah, that makes sense. Thanks!
...
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Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
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Old 01-21-2021, 01:23 AM   #11
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Default Re: Secondary Air Injection Vacuum Control Solenoid Valve

> it stops getting air injected...

Walker Exhaust has a very brief overview description of how the
CatCon systems evolved. They wrote that early cats were designed to
operate on engines running somewhat rich. All gas engines with camshaft timing for >3000 rpm require a rich mixture for cold starting.

So the preheaters on our Sats receive rich mixture at coldstart, and the rich exhaust is met with a fresh air blast, and the weakly coated (precious metals) preheater much accelerates the combustion in the exhaust stream. Then the air blast cuts off, and the mixture leans out.

The location of the precat would be ideal for a primary/main CatCon,
Except that it would make life challenging for the radiator, ignition, and cooling system. So, I think out precats have only a little bit of the precious metals (palladium, platinum, rhodium), only necessary for the conditions at coldstart.


On some later engines, many with the vee-six configuration, the Main CatCon is located close to the ExMan. Toyota and Ford use the config ... a mechanic reported that they never fail, while the catcons behind/below the powertrain
frequently cool down if the car drives through a puddle.
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