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Raymond Chen

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Everything posted by Raymond Chen

  1. 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 showed me the car. Would a bad alternator cause the symptoms that I have described previously?
  2. 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 fuse) seems to get pretty hot whenever I try to start the car. Is this normal?
  3. 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.
  4. just a couple of questions. When it starts, can you give it a little gas to keep it running? When you let off the gas, does it die? If you can do this, then my dianosis is the IAC Valve which you can clean and it will work like new. No, 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.
  5. 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 down on the floor. I also did some diagnosis, and I got code 13 from the check engine light, which has to do with "RPM signal 2." Could someone please help me with this problem?
  6. How do I test if the car is getting spark? I replaced the fuel pump because I found the original one to be bad. It would not run at all. The engine will not idle at all. It will just start and die simultaneously.
  7. 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 diagnostic port under the hood to make sure the fuel pump is working, and that I am getting fuel into the engine. However, the engine will not stay running. Whenever I crank the motor, it will come on for a split-second, rev to around 2000 RPM and then die. Could someone please tell me what could be causing this?
  8. I currently have a 1991 Lexus LS400 that will not start, even though it cranks. I have narrowed down the problems to be fuel system related, and I have already removed the fuel pump from the portal behind the rear seats. When I attached a multimeter to the terminals on the fuel pump, and turned the key to crank the motor, I found that I am not getting the full 12 volts as I should, but instead, I am getting only 4 volts. Can someone please tell me what would cause this?
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