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Re: Bought an Alero...bought a p0303...need help.
To test the CAT converter just run an automotive vacuum gauge (0-30 in-hg) and run the rpms up to a range of 2K-3K rpms and see what vacuum does. Connect to the upper intake manifold. If the gauge decreases below 15 in-hg and towards zero there is excessive exhaust backpressure or a clogged CAT. The problem with misfires is it will cause the CAT to heat up and may damage it.
What brand ignition wires and spark plugs to include heat range are installed? Most misfires are secondary ignition related.
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