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93 940 high Nox 900

posted by  someone claiming to be Gil on  Wed Jun 28 01:32 CST 2006 [RELATED]

The 940 failed yesterday due to high NOx, about 2x the legal limit. I'm thinking CAT, but someone else mentioned it may be running too lean. What are some common areas to check in regards to running too lean? Should I replace all the vacumm lines? Anything else?

Thanks,
Gil







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93 940 high Nox 900

posted by  Sumerduckman on  Wed Jun 28 09:15 CST 2006
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last visit: Tue Aug 21 11:31 CST 2007
[RELATED]

Things to check would be bad vacuum lines, leak in intake manifold gasket, leak/s in intake snorkel tube if it is a Bosch FI car, and weak or lazy O2 sensor. Next on the list would be clogged injectors or bad/leaky injector o-rings , low pressure at the fuel rail , or blinky ecu coolant temp sensor.
Check to see if it is setting any codes, that could give a clue.
--
Gary Gilliam Sumerduck VA, '94 940 Regina '86 240gl







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