I will be checking and changing all my fuses this weekend. Car is not starting now, so Ive gotta go through them all to be safe. Do I need to change them all, and do I also need to disconnect my battery as I proceed??

 

Thx forum......smh. Im new to the forum and posted this a couple days ago for a little insight from some of you experts. This is my 2nd LS400 ownership...a 91 & now a 95.

 

Perhaps the lack of response is due to the fact that no one has an answer for you.
Why do you think replacing all your fuses will sort out a non starting engine?
Back to basics, you say the car is not starting so is the engine turning over on the starter or not doing anything, if it is turning over then the 2 main requirements for it to run are fuel/gas and ignition/spark.
These are the areas you need to be looking at, it is unlikely to be a blown fuse.

 

try a 2 second shot of starting fluid into the air intake opening near the battery and then crank for up to 7 seconds and see if it starts, that will tell us a lot

do not crank for more than 7 seconds, and let starter cool for an hour between tries

overheating a starter due to long cranking sessions on a car not running right is a big cause of starter failure, and I ASSURE YOU, that you do not want to do or pay for the starter replacement job on an LS400!

there is no reason to replace a fuse that tests good unless it has obvious corrosion, do you know how to take a test lamp and ground it to the body and quickly test all of your small fuses without removing them? - do you know all of the fuse and fusible link locations on the LS400?

there are not many fuses that can cause a car not to start, and all of the ones that can on an LS400 are under the hood, not inside the car

 

Thx guys...it turns out that when I pulled the starter relay, there was some sticky residue on the contacts. I sprayer them with some DeoxIt contact cleaner and wiped it off. Car started up 5 times in a row after that. I also fixed my turn signal issue. My next prob is that I am presently changing my plugs, caps, rotors and wires. As I was removing the wires, by them being so old, the wires separated, leaving the boots on 3 cylinders stuck inside the engine.....how do I get them out?

 

long needlenose pliers? or a hooked pick.

 

Thx Pure Drifter.....gotta grab a pair. Thx Forum......much respect!!

 

recommend you stick with either NGK or Nippon Denso wires - other brands I have studied are pretty **** poor

if you get really hung-up on removing those stuck plug boots, the tool trucks (Snap-On, Mac, Matco, Cornwell etc.) have specialty tools that will get them out, ask your dealership or local shop what time they drop by.

 

Thx LSCowboy....you are the man....i will keep you guys posted

 

LSCowboy.....and Forum...grabbed a 12" pair of needle nose pliers to pull out the broken spark plug boots......fail!! The previous boots were made of plastic. Its now so brittle, that everytime I attempt to grab them, they break into pieces. My next solution is to use a long screwdriver and hammer to break the rest of the plastic boots up from around the spark plug. Then vacuum out each cylinder or blow the debris out with an air gun. Then remove the spark plugs.......suggestions? Mad as