Rich, Bear in mind that the frequency valve may stop buzzing if it's actually functioning correctly, too. Since the cleaning, your overall mixture may have changed as things clean out. Have you adjusted the CO mixture screw again to check? Remember, the best way to find out what is wrong with the car is to ask it, and listen to its answer. It sounds wacky, but it's the truth. Ask the right questions and your car WILL tall you what's wrong. Also, remember the principle of Occam's DeLorean: All other things being equal, the simplest solution is usually the correct one. It's natural for us to blame problems on components we don't understand -- everyone does it. You just have to break down the situation into the right parts. First off, you have to correctly define the question. The problem is not "what is the problem with the lambda system" -- it's "why is the frequency valve not buzzing when it should be buzzing". The main two hypotheses that can be formed from that question are: - The system IS functioning as designed (yes, that is a possibility, and remembering the principle of Occam's DeLorean, is actually the probability) - The second is that it is NOT functioning as designed. Then you need to come up with tests to try out each hypothesis. Here's a couple of things to try to test the first scenario: - Change the CO mixture and note the results. - Try checking the function of the O2 sensor per the manual... open the circuit, and do the test with the AA battery - Reread the section of the tech manual and come up with your own questions. For the second scenario, I'd try: - Check all of the electrical connections and grounds. - Run the tests per the manual on the frequency valve. As you see the results of each test, more tests may come to mind. Try them out, and see what you discover. That's the scientific method of DeLorean maintenance we talked about when you were working on the heads. You have become the DeLorean scientist already -- you just need to get back to it. The secret to Zen Maintenance is not a "knack" or a "gift"; it's simply putting enough pieces together to see the big picture. There is a perfect DeLorean engine that you are coming to understand. Yours, at present, does not match that mental picture, right? So start to look at it from all the different angles, and see how yours differs from the perfect one. Study the differences, and you will find an answer to your question. Okay, that's enough of the Zen ramble for today. =) -Dave [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/SIG=12cpcs5o6/M=267637.4116732.5333197.1261774/D=egro upweb/S=1705126215:HM/EXP=1068664639/A=1853618/R=0/*http://www.netflix.com /Default?mqso=60178338&partid=4116732> click here <http://us.adserver.yahoo.com/l?M=267637.4116732.5333197.1261774/D=egroupm ail/S=:HM/A=1853618/rand=939457579> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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