Hmmm..They tested the pump even without the control unit? That is impossible. I am really an expert on this one that is why I recommend you to have a second opinion on a different car mechanic. From there you would have an idea. And just to share my knowledge on engines, just incase you are...
Good think you have a local mechanic near your neighborhood. At least you have someone to guide you while fixing your engine. Just to add up, you should check your engine regularly. Check the valves if they are working properly. If there are damages, you need a Valve Spring Cup Cutter to remove...
I think you should just remove the EGR gunk completely. The pipe is just plumbed start back into the air because there is no crank case breather filter on these kinds of cars.
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I love engines!
I love my Valve Guide Cutting Tool!
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