Question about 1994 Chevrolet K1500
Just bought a 1994 chevy k1500...went to get emissions tested and it failed at 275 Hydrcarbons...took to my mechanic and we put on all new ignition system and fuel filter...took back for emission and failed again at 230 hydracarbons...brought back to mechanic and we put in new injectors and fuel pressure regulator...took to emissions the next day (today) and the hydrocarbons sky rocketed to 380...any help i would love...thanks
Have your temperature sending unit checked to be sure the computer is taking it out of cold start mode. Most likely it is not working and still dumping too much fuel into the engine and causing the high reading. Think about what I just said, makes sense doesn't it.
Posted on Jul 11, 2017
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Posted on Jan 02, 2017
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
sounds like a bad cat and o2 sensor. try a scanner, if the downstream sensor is attempting to make a 99% fuel trim adjustment, you can bet it needs changing along with the catalytic converter. get someone to follow you and accelerate hard, a rotton egg smell is a dead giveaway
Posted on May 28, 2010
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