Question about 1994 Chevrolet K1500

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I have a 1994 chevrolet k1500 running SUPER rich

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

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  • Chevrolet Master
  • 1,811 Answers

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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4 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Anonymous

SOURCE: 1991 chevy s10 pickup 4.3 engine

Check for vac. leaks and timing.

Posted on Jul 13, 2008

Anonymous

  • 5 Answers

SOURCE: 1986 camaro emissions problem- 6 cylinder stick

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

gandergmm

Wolf

  • 145 Answers

SOURCE: I got a 95 corsica 2.2L failed emission test the

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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Thank you for suing Fixya and keep me posted, be glad to help you get your car running 100% again soon

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