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I was also wondering if the problem could be a bad alternator? Every time I try to start the LS400, it has been by jumping it with my other car, because the battery in the LS400 is dead. The guy from whom I bought the car said the battery was new, but it has been dead since when he first...

Ok, I pulled the relay under the hood labeled "Main Engine Relay," tried to start the car without it, and it did the exact same thing. I was wondering, since the car displayed the same symptoms without this relay, if this might be the problem and the relay is bad. Also, the EFI relay (not the...

How do I test if the MAF sensor is good, and where are the marks on the timing belt located? Thank you so much for the advice!

I tried starting the car with the MAF sensor unplugged, and then with the MAF sensor plugged in, and during both times the engine would still shut off immediately after it started. Also, code 13 seems to come up intermittently. Every time I clear the codes, code 13 doesn't come up immediately.

I don't know if this will help, but I also want to add that stepping on the gas pedal doesn't keep the engine running at all. Sometimes, it seems like stepping on the gas pedal actually kills the engine even faster.

Where exactly are the cam sensors and the crank sensors?

Ok, today I worked on the car a little bit more. The engine will now occasionally run for a little bit longer, more like around 3 to 5 seconds, and then it will die again. This happens every time I use the deflooding procedure, by cranking the car a few times with the gas pedal all the way...

Hello everyone, I just finished replacing the fuel pump on my 1991 LS400. However, I am still having a problem starting my car. I know the fuel pump works because I can hear the fuel surging under the hood every time I turn the key to crank the motor. I even bridged the B+ and FP pins in the...