mattmatt350

My 99 camaro is throwing a p1416 code and I have never seen this before. It is also throwing codes for running lean on both banks so I was wondering if this had something to do with it. Anyone have an idea or had the same problem?

fastazzls1

any recent work done manifold off or anything in that nature

96SilverZ

iTrader: (2)

probably a vacuum leak, is your idle higher than normal?

1 FMF

iTrader: (1)

p1416, and p1415, are the air check valves on the exhaust manifold.
my 2002 did it last year.

https://ls1tech.com/forums/general-m...lve-where.html

replace both, cost around $11 each.
GP sorenson valve, duralast #E204, oem #779-2929

current autozone part number = 555050, "air pump check valve"

might be able to find them cheap on rockauto also.

Jr.Samples

If it is not the air check valve on the passanger side I understand it could be the air pump not getting enough air on that side due to some restriction?

1 FMF

iTrader: (1)

from what i can remember, the restriction is the air check valve... when the pcm commands the air pump on it expects to see a leaner condition on the O2's. When it doesn't it throws P1415 and/or p1416 for driver's side and passenger side. What happens over time is the rubber-like diaphragm in the check valve hardens from the exhaust heat and becomes a restriction. some people say cleaning them out is a solution, and it might be if they are caked up with carbon. Mine were not, they were clean. I would get p1416 every 7-10 days and would reset it with a hand held scanner. I got around to replacing both check valves and code has never came back. I say replace both check valves because if they are both 10+ years old and one check valve is restricting throwing it's respective P141x code, then it would be no surprise the other check valve of the same age is not too far from failure also.
I would have to look at the full diagnostic for the air pump system and the relevant codes, but to my knowledge it's fairly common a p1415 or a p1416 code by itself is a good indication it is an air check valve. If the air pump itself was not working I think there's a different code for that, plus both O2's would not see a leaner condition and you should see both p1415 and p1416.

I just re-read the original post, "also throwing codes for running lean on both banks".
I only saw P1416 posted, so if it's just that then i'd be fairly confident it's just a check valve especially for a '99. But if you have other codes being thrown then obviously you may have other problems, need to post those in order to diagnose properly along with any other work and mods done.

mattmatt350

I had a coil pack replaced on the cylinder on the passenger side all the way in the back (not sure if its #7 or 8) and I believe the the tube coming off the header was removed for some reason. I thought that had to do with the egr but anyway I forget the code numbers but I also have a high idle code. I'm going to take everyones advice and replace both check valves. Thank you everyone for the help!