It could be many things but it depends on what you mean by "won't run." I would need a little more background information. I will assume that it was running, and you parkd it, and then would not restart. Did it crank, or click, or do absolutely nothing? If it cranks but does not start there is a 90% chance that it is an ignition problem. Since the LS400 engine uses 4 cams and two distributors, that is an unlikely scenario. If it clicks you need to have someone look at the headlights while you turn the key. If the lights dim noticeably when you try to start it, it is either a problem with the battery terminals or the battery itself. In a worst case scenario the starter could be gone but it most likely would have given some indication of problems. Starter problems are very limited with this car, not unheard of, but very uncommon. Most actual starter problems are due to worn contacts on the starter, but not the starter itself. Thie would not be a big issue except that the starter is located UNDER the intake manifold, it is a very big issue to service. If NOTHING happens (no crank, no click, no headlight dimming) it might be the neutral safety switch. You can check this by trying to start it in the NEUTRAL position.
If you tell me more details I will try to help. My guess is that if your battery is 4 or more years old, it may be the problem.
If this is the fault of the neutral safety switch, it may not start in the NEUYRAL position, either. My experience with this issue was to put it in PARK, then turn the key while putting some pressure on the shifter, pushing it slightly towards the ashtray. It works every time.
I admit this is not a fix, it will keep you from getting stuck.
You need to warm up the engine until the guage reaches halfway. Otherwise, you will flood the engine and it will not start. There are many links on the Internet on how to get it to restart, but I've had no luck. The dealer fixed it for free. By the way, the less it warms up, the worse it is! Do not start your engine and then just shut it off. It will not restart! ALWAYS warm it up before shutting it off.
I also have a 1994 Nissan Quest. The same thing was happening to my van. It would also stall out and when I put it in Park the van would restart all by its self. I noticed that if I turn the van off and then restart the van somethimes it didn't happen. It was the egintion switch. When I turned the key it wouldn't "spring back" like it should. All it do when that happens is turn the key just a little towards myself and that fixes the problem.
As long as the engine is running you will have power assisted steering. With the engine not running you will not have power assist and it will be hard to turn but turn-able. If the engine is overheating it would be wise to pull over and park when safe to do so and shut off the engine before expensive damage is done to the engine.
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