240 Failed on High Nox

Discussion in 'Volvo 240' started by Darius Johnston, Nov 16, 2012.

  1. Darius Johnston

    Darius Johnston

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    Howdy all,

    So I pulled my old 240 out of storage (job related) after 3 years.

    Tuned it up rolled in for smog and was surprised it failed. So I went after the normal culprits O2 sensor, decarbonized, vacuum leaks. Failed again. It'd been almost 17 years so I replaced the Cat. Still no dice. All other emissions are super low but it seems I'm getting NOX (~3500) cause of a lean mixture. Checked the fuel pressure (~40psi), which seems fine even under load. Checked the injectors which all seemed good (41-33).

    Checking the AMM gave me 2.1V (<2.3V spec) and it gave me fluctuations in a peak response. Replacing that tomorrow.

    Anything else I should check for running so lean? It's CA so they're pretty stringent and since it was PNO in storage I need to pass well or it's time to retire her.
     
    Darius Johnston, Nov 16, 2012
    #1
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