ihave a 92 lexus ls 400 .had new cats, timing belt water pump,cap,rotor,plugs wires. car was runing perfect for 6 months all of a sudden lost all power could not go aver 40 .checked underneath the car .the cats were cherry red.what are the probablecauses for this?

Asked by Jun 21, 2012 at 09:50 PM about the 1992 Lexus LS 400 Base

Question type: Maintenance & Repair

what would cause brand new cats to go bad?

1 Answer

210,435

Unburnt fuel getting into your exhaust will cause the cats to get blocked. So with all the parts you mentioned being replaced, I didn;'see the ignition coil/coils. You should have noticed a miss or ruff running engine, no? A check engine light?

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