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95 SL2 DOHC NOx failure
My 95 SL2 (DOHC, 215k miles) just failed the Harris Co, TX emissions
test for the second time, NOx in both cases. After the first failure I replaced the EGR valve, which was pretty dirty and which may have been sticking. I would occasionally get the 32 error code, so the computer thought there was a problem with it also. I also replaced a number of other items: coolant and air temp sensors; plugs; plug wires; valve cover gasket (old one leaked oil into the spark plug wells, no reason to put new plug wires into pools of oil); air filter. Changed coolant; changed oil and filter. Also cleaned out the throttle body and idle air control valve. Also replaced the PCV valve. Second time around it also failed, at least the first part of the test - high rpm on "dynamometer" test, NOx failure as before. I would appreciate any repair suggestions that will get this thing to pass. Most of the parts I've replaced fall into the "routine maintenance" category, but I don't want to continue down the "try replacing this" trail unless there's a good chance that it'll solve the problem. The blue book value on the car isn't that great, and since I anticipate moving outside the Harris Co. air emission testing zone in several months it'll be a moot point anyway. TIA. Bob T. |
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Sounds similar to my failure two years ago with a 93 SL2. I failed four
years ago, but cleaning the EGR valve made it pass. Two years ago I replaced the EGR with a new one, as well as the EGR solenoid, but no dice. Under a broke people's assistance program, a garage changed my catalytic converter for a few hundred, and that did the trick. On Sun, 05 Jun 2005 12:48:29 -0700, Bob wrote: > My 95 SL2 (DOHC, 215k miles) just failed the Harris Co, TX emissions > test for the second time, NOx in both cases. > After the first failure I replaced the EGR valve, which was pretty > dirty and which may have been sticking. I would occasionally get the > 32 error code, so the computer thought there was a problem with it > also. > I also replaced a number of other items: coolant and air temp sensors; > plugs; plug wires; valve cover gasket (old one leaked oil into the > spark plug wells, no reason to put new plug wires into pools of oil); > air filter. Changed coolant; changed oil and filter. Also cleaned out > the throttle body and idle air control valve. Also replaced the PCV > valve. > Second time around it also failed, at least the first part of the test > - high rpm on "dynamometer" test, NOx failure as before. > > I would appreciate any repair suggestions that will get this thing to > pass. Most of the parts I've replaced fall into the "routine > maintenance" category, but I don't want to continue down the "try > replacing this" trail unless there's a good chance that it'll solve the > problem. The blue book value on the car isn't that great, and since I > anticipate moving outside the Harris Co. air emission testing zone in > several months it'll be a moot point anyway. > > TIA. > > Bob T. |
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