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1993 Lexus Ls 400 Questions & Answers
Car will start but dies when pressing the gas pedal
It sounds like you have an issue with something in your air/fuel mixture electronics. This could be something in your throttle body, mas air flow sensor, or even an oxygen sensor. When your car is idling the air/fuel mixture is acceptable for the engine to run. When you press on the gas either too much gas is dumped in the engine or too little. If you look at your exhaust pipe you may notice a heavy built up of black soot. This would indicate that your vehicle is running extremely rich (too much gas), if your exhaust is very white then your vehicle is running lean (too little gas). The smell of the exhaust can also tell you something about how the engine is running. If it smells sweet it is running rich. I hope this helps and please don't forget to rate me.
1993 Lexus LS400 acceleration stalls or surges
I HAD THE SAME PROBLEM WITH MY CAR. 93 LS 400. THAT WOULD BE YOUR FUEL FILTER OR THE FUEL PUMP GOING BAD. TRY CHANGING THE FILTER FIRST. THE DEALER TRIED TO CHARGE ME $980 TO CHANGE FUEL PUMP.
My 93 LS400 defaulted to 3rd gear. Does anyone know whats wrong
Now, I'm not saying this is a fact, but my TH700R4 trans did that very thing, wouldn't come out of third. And with no 3rd it won't go to overdrive. I rebuilt the trans and found the overdrive drum was all scarred and caused the limp home thing to happen, third gear was as high as it would go. I suggest you have the trans checked out by a professional trans shop. As for it being a bear to start, that's a faulty temperature sensor. If it's not functioning, the computer doesn't know to put it into cold start mode, which increases the throttle speed and puts more fuel in the engine for starting when cold. Like a automatic choke system in earlier vehicles.
Gas pedal
Check around the mats and make sure it's not hanging up on this. Also be sure it's clearing the firewall and not her is interfering in the engine compartment
AC blowing heat and air at same time
Yeah Ron, the flap that covers the heater core is open and when you're moving the air is pushed over the heater core and into the cab your in. Possibly just a vacuum line of that controls said flap. Check all vacuum lines for good proper connection to these flaps because all of them are vacuum actuated.
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