ElijahxF

i replaced the alternator because the battery was pushing well over 14 volts (leaking out the battery vents etc) anyways it still has a hard time starting, in order for me to start it i have to turn the key to the on position and disconnect the EFI main relay wait 1 second then plug it back in then you can hear the fuel pump being primed, after you do that you're good to go. after driving it for a while last night i noticed that the EFI main relay was really really hot. i know that heat can do funny things to electronics, but my question is do they normally get hot? and ive noticed that these cars get hot as well even driving on the interstate (coolant temp is fine). ive been looking at doing the BFI mod so that the engine can breathe a bit better and maybe cool it down a bit. One more thing, does anybody know how to do the 12v ecu bypass mod? i know that its on Clublexus but i cant see the pictures for some odd reason. Ill keep you guys updated if i fix anything!

if you would like i could possibly take a video of trying to start it

so i'm in an epiphany. my Lexus sometimes will start and sometimes wont start. had it running 2 days ago but in order to start it i have to disconnect the EFI Main relay under the hood wait a couple seconds then jump the b+ and the Fp things under the diagnostics port inside the engine bay. engine cranks really fast (not used to cars cranking that fast maybe) just doesn't get any fuel. when you have the key on the on position and you jump the wires you can hear fuel going into the engine. what do you guys think that could be? Fuel Ecu, cold start injector? any help would be much appreciated. thanks!

drill some holes in the exhaust

Hey there Lexus forums i recently just bought a 1993 sc400 with ~230k miles on it for 900$ the guy i bought it from started the car in front of me cold and we drove it around for a bit. everything was working nicely. after i bought it i went to the gas station to fill her up. turned the car off and filled her up. next thing i know i try to start the car and it would just crank but not start.( it sounds like the starter engages really fast) (i dont know if this is important or not but there was a lot of pressure when i opened the gas cap) Messaged the dude and he said that he'd be over and help me to start the car. we tried to jump start it but it wouldn't work. after a couple more tries we finally get it running and it runs great. drove it ~90 miles to my house and parked it. wouldn't start again. it was getting late so i decided to say screw it and go to bed. next morning the battery is completely dead. no click from the starter or anything, doesn't make since since the battery is only a week old. if anybody could help me out i would really appreciate it. Thank you Update: i found out what was causing the battery to be drained. disconnected the negative battery terminal and ran a test light from the wire to the post and started pulling fuses. come to find out it was the dome light fuse. Does anybody know what is all hooked up to the dome light? i know sometimes the cigarette lighter is ran through the dome light circuit but other than that i have no idea. Also i found out that i could be a fuel problem because you can't hear the fuel pump priming at all. had a friend listening by the gas tank in the trunk and cycled the key a few times, tried starting it and nothing, no sound whatsoever. i charged the battery from 2 nights ago and tried it out when i got home from school and it started right up. weird. but once i drove it for a while, turned the key off then turned it back on it was fine.turned it back off and let it sit for ~10 minutes and it wouldn't start again. Does anybody else have this issue? and also does anybody have wiring schematics or fuel diagrams so i can take a voltmeter and see if its the fuel pump or the fuel pump rely