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You probably need to replace the cat 700

posted by  kilbrid3 on  Mon Feb 20 09:33 CST 2006
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Thanks All for you thoughts!

Here is the status. I went through the EGR system - pulled it all apart. I found something interesting. The tube coming from the EGR valve to the intake manifold was 80+ percent blocked. It must have to do with the hard turn in takes at the top. The rest of the system is clear. The valve functions well, and holds vacuum. The vacuum booster passes the onboard diagnositcs. I cleaned everything and put it back together.

While I was in there, I cleaned the breather box, and replaced the old cooked 0-ring that seals it to the block.

Since I have a free retest, and the EGR blockage could be a root cause for the high nox, I going to give it another try. I will keep you posted.

If this does not do it, I will go with the o2 sensor and cat.

thanks,

Bill






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