Runs bad

Asked by GuruYDNZM Feb 20, 2018 at 12:53 PM about the 2005 Dodge Caravan C/V Cargo FWD

Question type: General

My 2005  Dodge Caravan 3.3 engine code P0403
and P0406 came up I’ve change battery spark
plugs wires coil pack and EGR valve still  spuders
Runs bad could it me catalytic converter how do I
check

1 Answer
26,800

oilyspill answered 6 years ago

A clogged exhaust could cause problem. Check exhaust back pressure, use a pressure gage. With the proper fittings, you could remove front 02 sensor and screw in the gage. A spec I saw at idle says 1.5 psi or less. You could loosen the exhaust to let backpressure escape, to see if it performs better? Yeah, It will be a little loud. The cat seems to be the number one issue with too much backpressure. If backpressure is the problem?

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