Question about 1986 Chevrolet Camaro

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1986 camaro emissions problem- 6 cylinder stick

Failed emissions test in new jersey for hydrocarbons and carbon monoxide.Readings were hc-203, allowable 162. co 4.4, allowable 0.91. In addition the nitrous oxide passed test but seems to be very low .allowable -1227 actual reading 59. Is this a strong indication that the oxygen senser is not functioning and should be replaced? Could ignition timing contribute to this problem?

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High hydrocarbons indicates head gasket(1 or both) leaking , carbon monoxide is a worn out catylitic convertor which both could lead to the oxy sensor getting a false reading

Posted on Oct 28, 2008

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Here is some info for you to read, besides me explaining what ppm is, i also gave you some info of how to solve this, Ain't that special LOL. Mike

Overall Result: PASS or FAIL. A vehicle with a properly operating engine and catalytic converter will have very low HC and CO readings. However as a vehicle ages the HC and CO emissions will increase and may become erratic. As a vehicle ages it becomes increasingly important to be sure that the engine and converter are fully warmed up before the test to have the best chance of passing the test.

HC (PPM): The parts per million of hydrocarbons (unburned or partially burnt gasoline) in the exhaust.

CO (%): The percentage of the exhaust that is carbon monoxide (CO).

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RPM: The engine speed in revolutions per minute (RPM) or N/A.

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Cruise Emissions: The emission readings measured at 2500 rpm.

Cruise Result: PASS, FAIL or N/A.

Idle Limit: The maximum allowable HC or CO emissions at idle. The CO+ CO2 (%) must equal or exceed 6. This verifies an adequate sample of the exhaust has been obtained. N/A for O2 and RPM.



These are the possible problems:

bad o2 sensor
bad EGR valve
bad cat
bad timing
dirty injectors
bad plugs or wires
the less costly fixes include replacement of the o2 sensor and EGR valve i would not clean the EGR I would buy a new one there are very cheap you can pick these up at any local parts store .
also run some injector cleaner through your car at least a full tank of gas and one bottle of injector cleaner should be ran through.
you can also have your timing checked for a relatively low price.
and when you go into to have the vehicle checked make sure the car is been running because your cat convertor has to be warm in order to preform at it peak so do not do it when the car is cold.
all of the above are pretty reasonable fixes the general rule of thumb when you work on your own vehicle is start with the cheapest fix first then go on to the next.

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