NOX emissions help
Thread Starter
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Rookie
Joined: Jun 2012
Posts: 79
Likes: 0
From: California
NOX emissions help
I live in CA (I know "move to a better state") and my truck just failed smog, twice.
1st test:
NOX levels at 15mph measured at 1154ppm
Max: 992ppm
NOX levels at 25 mph
measured at 358ppm
Max: 596
-- checked EGR, replace thermostat, replace PCV Valve, check for vacuum leaks.
2nd test
NOX levels at 15 mph
Measured: 1110ppm
Max: 992ppm
NOX Levels at 25mph
Measured: 1079ppm
Max: 596ppm
Just by replacing the Thermostat and PCV Valve the levels went up by 721ppm at the 25mph benchmark.
Wtf?
1st test:
NOX levels at 15mph measured at 1154ppm
Max: 992ppm
NOX levels at 25 mph
measured at 358ppm
Max: 596
-- checked EGR, replace thermostat, replace PCV Valve, check for vacuum leaks.
2nd test
NOX levels at 15 mph
Measured: 1110ppm
Max: 992ppm
NOX Levels at 25mph
Measured: 1079ppm
Max: 596ppm
Just by replacing the Thermostat and PCV Valve the levels went up by 721ppm at the 25mph benchmark.
Wtf?
Amateur
Joined: Dec 2014
Posts: 44
Likes: 0
From: High Point, N.C.
High NOX
I would start by checking ignition timing and carburetor adjustment. You said you checked for vacuum leak. Also try clamping the hose to the brake booster with a pair of pliers. Check and make sure the EGR valve is not sticking open. You might try spraying brake clean around the intake manifold to check vacuum leak. hope this helps. newtjr
Record Breaker
Joined: Jul 2007
Posts: 2,040
Likes: 1
From:
spike the reg gasoline with straight methanol, 30-40%. it will run like crap, but should pass. or use E-85. OR make a secret propane injector. all so the experts here can give advice on what the engine temp should be.