Hi all,
My friend has 91 LS400 w/the 4.0 V8 w/180k and we can't figure this one out :cries: The symptoms are no engine codes thrown, lack of low end power, and the cats are glowing to the point of burning the excess oil and the engine bay is smoking ALOT! Also, acceleration from a stop results in a "put-put-put" sound from the exhaust. I've changed caps/rotors, spark plugs, spark plug wires, new, air filter, pcv valve, cleaned out TB, cleaned out EGR valve, replaced cats. The pickup is better, but the cats are still glowing when the engine is revved. What else can I do? Check timing? :( Any pointers are greatly appreciated! Thanks all...