Question about 1999 Chevrolet Astro

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High nox fail smog test any remedies? 99

High nox fail smog test any remedies? 99 astro van changed plugs & plug wires ... Van Runs better need to pass smog nox is to high

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NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Posted on Jun 07, 2010

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Posted on Jan 02, 2017

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I actually had to replace my EGR valve and the gasket. I clean the valve well and reused both. I don't think the gasket sealed well enough though. So I went ahead and got a new valve, gasket and changed them. It runs a lot smoother now.

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My 1990 chevy astro van didn't pass smog. Paperwork says it failed the following; Ignition timing: 99 ATDC. Also, ASM Emission Test Results; 15mph HC (PPM) max is 122 measured 127, 25mph max is 102...


the smog test looks like the engine is miss firing, that could cause the timing to be out of whack also, try a old fashioned tune up, new spark plugs, wires, and filters also replace the PCV valve. any time you see the NO that high suspect a miss fire.

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1 Answer

I have an 88 VDP. Recently tuned up in AZ with new fuel filter. Always passed smog tests with flying colors. Last test in '99. Now in CA failed as Gross Poluter for NOX. No EGR on this vehicle. Wondering...


Not sure the car can pass nox without egr. Why did you bring it to CA? A draw on the battery would not affect the smog test. What you would need to do is buy the intake and exhaust manifolds with egr ports and also the computer and wiring harness that will make the egr system work. Not worth the effort unless you are in love with this car.

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99 Astro van, While driving on highway 60 miles per hour, vehicle runs fine. Stopped at a light it shakes. The computer indicated a miss fire on cylinder one. Spark plug new, wire new. Recently had...


You most likely have an injector not pulsing or is restricted,try some lucas fuel treatment and see if it will clear it up,one bottle of lucas,and the least amount of fuel ,this will make it clean faster and better,you should see results in one mile or two,if it does not help,injector replacement might be the only solution.

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1 Answer

1992 dodge stealth failed smog test with high NOx reading at idle. passed perfect at high rpm , failed at idle. hat causes a high NOx reading?


NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

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