Smog pump or no smog pump?

[Connor strom]

Did chevy put a smog pump on 84 k5 blazers? I could have sworn on the emissions sticker i didnt see one listed...same in the chilton manual. But everything iv looked up on google seems to show one? Not to mention theres i cant seem to find where one would go on the engine. Any help would be appreciated.

 

[Connor strom]

Granted if the pump is in there i might just be over looking it so please excuse me if this is a dumb question haha

 

[diesel4me]

Not all GM trucks had one,depending on the GVW and emissions laws in your area...you'd know it if it had one,it would be mounted under the alternator on most engines,looks sort of like another alternator..
On an 84,it would likely have a thin v-belt drive to it..
Most trucks that old that had one,had it "deleted" by previous owners by now..which makes it tough to find one and the required brackets ,to restore it to OEM specs in areas that require one to pass "visual" inspection.

 

[Connor strom]

Not all GM trucks had one,depending on the GVW and emissions laws in your area...you'd know it if it had one,it would be mounted under the alternator on most engines,looks sort of like another alternator..
On an 84,it would likely have a thin v-belt drive to it..
Most trucks that old that had one,had it "deleted" by previous owners by now..which makes it tough to find one and the required brackets ,to restore it to OEM specs in areas that require one to pass "visual" inspection.

Yea i know if it had one from the factory i need it for inspection in my state. Upon closer look at the emissions routing sticker underhood you can see a spot that has over spray on it that if looking close enough can kind of make out air pump, feel dumb not seeing that before. So do i actually need to hook one up or just buy one and mount it on so its there?

 

[diesel4me]

If it had an air pump and the exhaust manifolds were still the originals,you'd see steel tubing and fittings coming out of each manifold port,that eventually went back to the air pump,with check valves in between them..and yeah,it should show up on the emissions diagram..

If you can get the part number off that emission decal,you may be able to google it,and find a better image of it..I'm not sure ,but I think GM used codes in the upper or lower corners consisting of 2 letters,like "CD" as an example--some may have a GM part number or bar code also..

To pass a "visual" inspection here,you must have the emission stuff mounted and "visibly working",in other words,if your air pump seized up,you cant get a sticker if you go in with the belt removed,its "inoperative"...but gut out the pumps innards and leave the belt connected spinning an "empty" pump,it "looks" like everything works--they let that slide,because they do not sniff test anything over 15 years old here any more..

 

[Connor strom]

If it had an air pump and the exhaust manifolds were still the originals,you'd see steel tubing and fittings coming out of each manifold port,that eventually went back to the air pump,with check valves in between them..and yeah,it should show up on the emissions diagram..

If you can get the part number off that emission decal,you may be able to google it,and find a better image of it..I'm not sure ,but I think GM used codes in the upper or lower corners consisting of 2 letters,like "CD" as an example--some may have a GM part number or bar code also..

To pass a "visual" inspection here,you must have the emission stuff mounted and "visibly working",in other words,if your air pump seized up,you cant get a sticker if you go in with the belt removed,its "inoperative"...but gut out the pumps innards and leave the belt connected spinning an "empty" pump,it "looks" like everything works--they let that slide,because they do not sniff test anything over 15 years old here any more..

Hmm.. iv looked before and dodnt see any of the steel tubing that you described. The truck has headers on it as well not sure if that would effect putting a new smog pump on. The engine was also swapped over to a 350 from a 305 some time down the road before it became mine, not sure if that matters ether. The owner before me had stated that to his knowledge the truck never had a smog pump, and he was able to get current tags on his plates. I believe they do a "sniff test" where im located but cant remember if they do a visual or not? Should i just bring it through and see what they tell me?

 

[Connor strom]

Also if visual is needed would it suffice that i have air pump installed with belt on but not actually hooked up?

 

[diesel4me]

Here,all the "plumbing" would need to be intact,to pass visual inspection...no missing parts allowed..

If it has had a motor swap and now has headers,then the oem exhaust manifolds are likely history--they would have been drilled and tapped for the "flute pipes" if it came equipped with an air pump...

I'm not sure what your area will require--you may well be able to pass the smog test without a pump being there at all--I find a lot of the time,whether you pass inspection or not depends on a lot of things,not the least of which,who does the inspecting,how anal they are,and what mood they happen to be in at the moment..

You could call an inspection station in your area and ask what they require to pass a vehicle as old as yours as far as emissions...here most places wont care if your lacking an air pump,etc,if it'll pass the sniff test,but the "rules" likely state all the stuff must be there and working...

 

[dyeager535]

Really depends on your state/location. Some do a visual (CA is probably the most stringent overall) others just do a sniffer.

Running right it should pass sniffer without AIR. Unfortunately, you are better off never removing it if there is any chance it will be sold or moved and subject to a visual...the cost (and hassle) to retrofit AIR that has been completely removed is pretty bad.