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Repair guides and support for the 4th generation Chevy Caprice, a front-engine, rear-wheel drive full-size sedan. Closely related to other GM B-body cars such as the Impala SS and Buick Roadmaster.

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My 1992 caprice is having trouble passing California smog check

My 1992 caprice is having a hard time passing California smog check before I took it in I had replaced spark plugs and wires oxygen sensor throttle position sensor coolant temp sensor map sensor air idle control valve and it failed there was a check lite on it only comes on now when I run it hard or on highway after car has been running it seams like its guna Die but sometimes will spudder and almost die but will kick in after a few seconds then I had timing checked it's dead on 0 zero so I'm at a lose her can you help the converter looks and seams ok that's like the only thing I haven't replaced

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Hi @daytons ,

Check if there are any codes showing in the OBDI port which may give an idea of what is happening in the engine.

As far as I can find out your model has an OBDI system. (also known simply as OBD)

As best that I can find out OBDII came out in 1995 for your make and model, you may wish to verify this however.

Here’s a link that may be of some help on how to do this.

If it works and there is a code showing search online for what the code means for your year model vehicle.

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Andrew estará eternamente agradecido.
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