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Having troubles with a/c as well. No power to a/c compressor and lcd display is burnt out. Where's the first spot to trubleshoot appreciate any input.

I have a 1990 ls400 and the moon roof is touchy sometimes and the rear passenger window won't roll up (goes down though). A few months ago I lost brakelights, turn signals and hazards on my Ford Expedition. A little wd40 in the hazard switch cleaned the connection and fixed everything. I'm gonna try this on the LS driver switches tomorrow. Sorry if I hijacked your post or thread just had a thought.

COdes return after around 2,000 rpms. The did sit for four years. I pumped the tank out and replaced fuel twice along with fuel. After reading and searching I'm thinkg tune up, temp registration, and a few hot laps. Don't know.

I'm stummed. Again, thanks

Just replaced both knock sensors, still getting codes52,55 . Anyone have any ideas? Most appreciated

Apreciate the input

Pull #1 spark plug and insert long screwdriver or something similar and feel for the piston to rise as you rotate the crank. If the piston starts to drop then turn the crank back. Thats just about TDC

Is coolant staying full? Sounds like a blown head gasket leaking coolant into cylinder and coming out exhaust. If coolant not leaking down then this isn't the problem so easy to check.

Thankyou for the reply. The coolant level is normal, oil is coolant free and compression is ideal on every cylinder.

Recently replced engine in 990 LS400. Runs great but notice alot of moisture out of the exhaust and after replacing on knock sensor I am getting trouble codes 52 and 55. Any help would be greatly appreciated.