Hello,
This is a follow up post to the following thread.
I have just failed it after I have changed oil, spark plugs [Bosh Platinum Plus plugs] and with the correct Air Mass Meter. One thing to note, the idiot tester drove the car on the trademill without the overdrive engaged. I told them but they just didn't understand what I was talking about :( I don't know if this would have affected the test. I doubt it since it failed with double the allowed limits of NOx.
The car failed only on the NOx category but passed fine in the CO and HC with nice margins. I have changed almost all what should be routinely replaced. Rotor, Cap, O2 sensor is only about a year old with less than 10K on it. Flame Trap and hoses changed with the O2 sensor.
The only remaining item on my list is the AirBox Thermostat [AutoZone and Advance Auto Parts doesn't even know what I am talking about].
Now, the EGR valve comes to picture as the major player in NOx from my research of as to how it works. I do have a Haynes manual for my volvo but I can't find any mention of an EGR valve anywhere. The valve is pretty expensive new $200-$250. I am thinking to go to a U-Pull it yard and get a couple to try. My only problem is that I don't know exactly how it looks or where is located in the car. I would appreciate any help in that regard.
Pictures of where is it or description as to where is it exactly would be greatly appreciated. Thanks a million.
Note: I really thankful for the Volvo help you guys have given to me in the past. The car's mileage has gotten better after I had used the correct Bosh AMM with xxxxxx007 but still below the EPA estimated numbers for the old tests but somewhat okay with the new test procedure results.
Thanks.
-- Hameed.