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I first had this trouble with an old EGR a day after I bought the car, but the dealer did the smog check and I was good for 2 years, so it was no big deal and it was under the old smog rules, otherwise it would have failed for the dealer.
I thought it was a bad EGR valve when it said code 75 so I bought a new EGR valve for $200.00 and still had the same problem, code 75.
Now it's time for a smog check under the new california rules and it failed because of that code 75. So I tried everything I could think of to make it pass, but I wound up taking it to a mechanic and it
Finally passed. They said the EGR ports were clogged. I don't know how they could be clogged, since I tested the EGR and all 3 solenoids opened. But they cleaned it out and it passed the smog check. Cost me $340.00 to have that done, plus the smog check.
Here's what my #'s were, incase anyone is interested.
This is what they allowed 15mph HC 84 CO .49 NO 692
25mph HC 49 CO .46 NO 711
First test 15mph HC 6 CO .06 NO 1181 fail
25mph HC 5 CO .05 NO 1400 fail
Then I put in new spark plugs and wires.
15mph HC 1 CO .01 NO 1467 fail
25mph HC 0 CO .01 NO 1444 fail
Then I cleaned out the EGR passage inside the upper intake manifold
15mph HC 13 CO .07 NO 686 pass
25mph HC 1 CO .01 NO 1163 fail
Then I tried some stuff I bought on the internet, some blue sky stuff and also used octane booster.
15mph HC 7 CO .06 NO 659 pass
25mph HC 4 CO .05 NO 1152 fail
After the mechanic did the EGR port cleaning
15mph HC 3 CO .02 NO 429 PASS
25mph HC 0 CO .01 NO 549 PASS
Total cost to get my car to pass this stupid smog check, $640.00
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