Question about 1996 Saturn SL

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Failed 3 tests with emissions

I have a 95 TSI and I failed the NOx test, the CO2 test, and the HC test and I dont know what to do to fix it. Im going to try running on race fuel to [*** the HC so its a cleaner burning fuel but what about the other tests. please email me answers

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Clean up your mass air flow sensor and check the map sensor...both can mess with ignition/fuel settings. Neither may be out of range enough to give you any performance problem but together they can do that. If you are going to add race fuel, it may also help to add 3oz of acetone per ten gallons of fuel. It vaporizes faster than gasoline and burns cleaner. It will also clean your injectors. A slight egr malfunction can also throw off readings but will not show up as a problem unless it becomes worse, but usually shows up as an idle problem first.

Posted on Jul 17, 2009

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  • Master
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If you add anything to the fuel your nox will get worse. It may bring the HC down but you wont solve your problem. What the problem is your explosions in the pistons are getting to hot. Your most likely running lean. Or you may have a bad catalytic converter or even both. You really have no option but to have a repair shop diagnose it.

Posted on Jul 17, 2009

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