Combi valve & Secondary air injection

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Apr 28, 2009 | 04:56 PM

justincr250

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Combi valve & Secondary air injection

2.8L engine. Mechanic says my check engine light is caused by combi valve and seconday air injection to low. Id like to do some of the work myself. Whats all involved in this project?

On a side note - Do you think Id have luck posting in the A4 forum also?

Apr 29, 2009 | 12:34 PM

Kris Hansen

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I have not had to replace any combi valves, I usually get an incorrect flow now and then, clear the code, and it stays away for a wile...

Apr 29, 2009 | 02:46 PM

justincr250

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Ive cleared the fault a few times already and always seems to come back. Guess Im going to bite the bullet and just replace this thing. Doesnt seem to be a lot of info out there on these things?

Apr 29, 2009 | 03:04 PM

Kris Hansen

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gotcha. Do you have the Bentley manual? I haven't even looked up the procedure.

Apr 29, 2009 | 03:45 PM

justincr250

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Quote:

Originally Posted by Kris Hansen

gotcha. Do you have the Bentley manual? I haven't even looked up the procedure.

I dont have the manual. Sounds like the combi valve is close to the firewall? Ive also done some searching and people are saying there is a right and a left?

Apr 30, 2009 | 12:45 PM

Grapeking

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From: Northern NJ

Correct. The Combi valves are at the rear of each of the cylinder heads, they look like small bright metal cans. Right and left Combi valves are different.

Apr 30, 2009 | 03:58 PM

justincr250

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Grapeking,
I know you're not a mind reader but when the mechanic writes on your ticket "needs replace of combi valve - secondary air flow to low". Does that mean I need to replace both?