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jgx421
03-03-09, 01:34 AM
Hey there, I was considering a set of headers for my 99 Sonoma 4.3L. My problem is that I don't know if my truck has AIR Injection or not. The header company(JBA) offers them with and w/o Air Injection. How can I tell if my truck has this?
87wildside
03-03-09, 05:34 AM
Do you have a smog pump?
87wildside
03-03-09, 05:45 AM
I didn't feel like looking for a 4.3 but this is AIR injection. On the 4.3 the tubes run into the exhaust manifold rather then the cylinder head.

http://www.sweethaven02.com/Automotive01/fig0451.gif
jgx421
03-03-09, 11:18 PM
I checked and don't have a smog pump or any lines going into my manifold. So I guess it doesn't have AIR. Thanks for your help .