I have a suspicion my combi valves are blocked after failing a readiness code and comes up with secondary air injection insufficient flow.
Iv taken up the pipe from the pump and opened up the combi valves with a vacuum pump and find it very hard to blow into once they are open.

I’m gonna try take the pipes off the valves them selves to see if there is a blockage within the pipe it self but is there a way I can just spray something in there with a air compressor to de gunk it?
Possibly brake cleaner of some sort? Or will this damage my cats?


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