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1.5 liter z engine running too rich

Can't pass emissions although its running great. plugs indicate it is running too rich.

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CHECK YOUR AIR FILTER ,IF ITS CLEAN SUSPECT MAP SENSOR

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I have a 1997, chevy alumina it won't pass emissions. It keeps throwing the code p 0336. However,.the sensor is good. What do I need to do to get it to pass?


There is some other issue as well with the engine if it has failed emissions testing.

Have the vehicle scanned to see what other fault codes if any have been generated and to see what irregularities there may be with the operation of the engine. It may well be failing emissions because it is running too rich or it could be for numerous other reasons.

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00 nissa sentra running rough while idling


check for any catalytic converter failure, check emissions first.

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My 1999 pontiac sunfire 2.2 liters did not pass the e-test. I feel that something tells my computer to run rich at 2000 rpm. I changed the spark plugs and the air filter. After driving 200 Klm. the engin...


The code P0137 means that your downstream O2 sensor has low volts. A rich running engine makes the voltage go high, not low. If the upstream sensor is not reading a rich or lean condition, then you need to replace your downstream O2 sensor.

Dec 21, 2011 | 1999 Pontiac Sunfire

1 Answer

I have 1993 pontiac bonnevile, it will not pass emissions the nox levels are to high this is the fourth try. what can i do. also my check engine light comes on as well.


high NOX indicates your engine is running high combustion temps. Two of the major reasons for lean mixtures are intake leaks and clogged fuel injectors. The reason the engine computer cycles between rich/lean when running is because the cat needs lean mixtures to deal with HC and CO and a rich mixture to deal with NOX. If you are running lean the cat can't lower your NOX. I would first get your fuel injectors flushed and de-carbonize your intake/combustion chambers.

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Wont pass emissions Co to high new air pump tune up made little diff


Fuel mixture too rich. Is that carbureted or fuel injected?

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89 Honda Prelude failing emissions rich


is everything stock? and you have catalitic converter in place?

Stop by Schucks auto supply and have them run the codes. i'm sure there is a code if you cant pass emissions. your check engine light bulb is probably out.

and usually the first cause is the first o2 sensor.

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My 83 cutlass supreme check engine light on


It means the car is running too rich. Check the air filter. If it clean you will likely need to rebuild the carb if it hasn't been done. If it has you might just need a carb adjustment.

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1 Answer

1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

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1 Answer

1994 safari


There are a few thing I need to know, what engine do you have, how many miles on the van, what part(s) of the test did it fail?

Sep 24, 2008 | 1994 GMC Safari

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