Both My Ls400's Will Not Start

[mrsrt8]

My Lexus will start then dies within a few seconds. Code scanner is not pulling any codes, fuel pressure device is pulling 40psi. I installed a new battery 2 days ago, I've checked wiring, fuses etc and need some different feedback please. Car was idling a little fast, distributor caps, timing belt, water pump, condenser, radiator, valve covers, engine mounts, spark plugs, power steering pump were all replaced. One day as I was going to school, the car traveled over a series of speed bumps. On the last speed bump, the car made a series of knocking noises, three warning lights came on, and the car died. It would start, but immediately die.. So far in the past 3 months no mechanic in town has been able to diagnose the problem.

[fsuguy]

...see my post on your last thread regarding the same vehicle - there was a post also from landar that you probably should check out.