Ok all first a disclaimer: Those who deleted their secondary air pump system please chime in with knowledge but I am not going to remove mine.
My last issue since my rebuild has been an error with the secondary air pump system. I have tried doing the usual trouble shooting and have not found the answer.
My mechanic suspects a leak in the vacuum system on a seal that sits between the brake master cylinder and the firewall.
What happens is than when I start the car the secondary air pump runs quite loudly. If I wait until it stops I do not get a CEL, but if I don't wait I get a CEL and the scan below. I replaced the solenoid and the actual secondary air pump and that did not fix the problem.
What we suspect is that when the car is being driven before the pump shuts down the vacuum is being use for other things and as a result there is not quite enough to open the combi-valves fully and I get the error. We suspect the combi-valves are only opening slightly, just enough to inject air into the exhaust for it's usual purpose, but not enough for efficient use of the flow and thus the pump sounds much louder. I am considering applying vacuum to the combi-valve with a syringe to see if the sound is different. Too bad the combi-valves are so hard to get at to remove and actually examine.
There is an associated error message about "Brake Boost Vacuum System" but the brakes feel fine.
We tried to make the secondary air pump run the test (block 77 if I recall) which is done by reving the engine to 2500 to 2600 RPM and holding the brake at the same time but the test wound not run on either bank.
I did the brake test for vacuum and that gave a correct reading.
The exhaust temp sensor thing is very intermittent especially since I did the re-solder thing.
So any input?
Thank you,
Mike
PS it's nice having A/C once again.
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