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  #21  
Old 01-19-2009, 10:12 AM
gdewit79's Avatar
gdewit79 gdewit79 is offline
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2004 Chevy TrailBlazer LT
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I am going to have to try this... I have the same code, and GM tells me it is the secondary air pump. They tested it, said it was working and probably froze up. Gave me a quote of $450 plus taxes to fix.
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  #22  
Old 01-19-2009, 07:54 PM
texasgrand texasgrand is offline
 
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Air Pump

If you take the hose off the air solenoid valve and the other hose from the pump off the intake to the air breather (about 1 to 1/14" hose) you will have the suction and discharge from the secondary air pump disconnected. The pump only runs from a cold start so start the truck and see if you have suction from one hose and discharge from the other. If you do, your air pump is OK. If you hear loud engine noise out of the solenoid, your solenoid is OK. If the pump doesn't run, it could be the pump or sensors/electrical powering the pump.
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  #23  
Old 01-24-2009, 04:09 PM
jpru5112 jpru5112 is offline
 
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Quote:
Originally Posted by chunk351 View Post
Just know that diagnosing this is time consuming since the "system" is only active for a few seconds on cold start.

for now:
1.) wait for your car to be "cold" or 4 hours. Disconnect the hose from check valve (located passenger side--the transmission dip stick is attached to the bolts that hold it to the block). Start the truck, you should hear a nasty sound for about 30 seconds to a minute. If you don't its your check valve.
1a.) If it is your check valve, you can try to clean it. Get some throttle body cleaner, remove the check valve spray thouroughly (I did it a couple of times to get all the carbon and rust out) and let dry reinstall and follow above instructions. If no go replace check valve

2.) wait for your car to be "cold" or 4 hours. remove the fattest hose from the underside of air intake hose (I think thats where it is, I have a CAI so Its hard to know where it is exactly OEM) and from the check valve. Have someone else start the truck. Feel the hoses, you should feel sucking and blowing (I can't remember which is supposed to blow / suck) If you don't feel anything then its the pump (maybe -- read further)
2a.) check fuses there are about 3 in the manual listed for air pump (if bad fuse replace and retest, make sure to check the fuses after to make sure that the pump isnt blowing fuses)
2b.) Locate the air pump its driver side mid car just behind the cross member for the frame. There are two wiring harnesess one that goes into the relay (grey box) and one that has two fat wires (thats the power plug for the pump.) disconnect that one, wait for cold start and start truck while having a multimeter attached set on DC mode. If you get a reading of 0 then replace the relay. if you get power 12-15 volts replace the motor.
3.) If both the check valve and the pump are testing out ok it could be a clogged hose.

Hopefully that was helpful I will try to get some pictures of the parts and post this in a clean thread


So I removed the hose from the check valve (step 1) and water ran out. I take it that means the valve is bad?
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  #24  
Old 01-25-2009, 02:13 PM
quirino18 quirino18 is offline
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Quote:
Originally Posted by gdewit79 View Post
I am going to have to try this... I have the same code, and GM tells me it is the secondary air pump. They tested it, said it was working and probably froze up. Gave me a quote of $450 plus taxes to fix.
the pump itself is $90 at the dealer!! there is only 2 bolts thats all!!! i hope you dont pay that money for that??? bring it to me and i'll change it for $200 LOL
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  #25  
Old 01-29-2009, 09:12 AM
jpru5112 jpru5112 is offline
 
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Quote:
Originally Posted by quirino18 View Post
the pump itself is $90 at the dealer!! there is only 2 bolts thats all!!! i hope you dont pay that money for that??? bring it to me and i'll change it for $200 LOL
Advance Auto had no idea what I was talking about when I asked for a check valve for the secondary air system. Does anyone have a part number?
Mine is a 2005 4.2L
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  #26  
Old 01-29-2009, 09:14 PM
texasgrand texasgrand is offline
 
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Posts: 9
air system valve

Technically its a solenoid valve. You can probably get it at the dealership for about $125.
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  #27  
Old 01-29-2009, 09:38 PM
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the roadie the roadie is offline
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parts4chevys.com has it listed as a check valve. $128 list. $80 for you.

Oddly enough, Advance Auto doesn't have it on their web site either. Nor Autozone or Autowarehouse. Hmmmm, beginning to think it's a dealer-only item. Sigh....

There's one on Ebay for $90, but the vendor is a lying S.O.S.

Part number on this is #12583486, The AC-Delco # for this is #214-1683. (The AC-Delco number is for reference only our)

The dealship price on these Air Check Valves are $280.00, These are at an awesome price especially for OEM not Aftermarkets or copies.




OEHQ.com says that AC-Delco part number has been replaced by 214-2151, GM part number 12619110, but I'm not sure I believe that without more evidence because parts4chevys.com has that listed for 50% higher price, and I can't find out where it's used.



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  #28  
Old 01-30-2009, 03:40 AM
Elevatorguy Elevatorguy is offline
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Quote:
Originally Posted by the roadie View Post
OEHQ.com says that AC-Delco part number has been replaced by 214-2151, GM part number 12619110, but I'm not sure I believe that without more evidence because parts4chevys.com has that listed for 50% higher price, and I can't find out where it's used.
I replaced my check valve a couple of months ago with an AC Delco and the part number was 214-1092.
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  #29  
Old 02-01-2009, 10:14 AM
ddurfey ddurfey is offline
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2004 Chevy TrailBlazer LT
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I just had this problem on my truck and didn't have to replace a single part. The power wire to the relay mounted next to the air pump had apparently rubbed against something because it was broken in two and slightly corroded from the salting of the roads here in PA. before you buy any dealer parts, spend some time testing everything. pull the parts off and check them for function. also....if you do need parts, call several dealers. i had priced both the valve and pump and dealer prices WILL vary. i could have saved quite a bit of money if i needed them by driving about 10 more minutes to a dealer than the one around the corner.
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  #30  
Old 02-02-2009, 12:30 PM
chunk351 chunk351 is offline
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2004 GMC Envoy SLE
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yeah its amazing what the salt can do
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