1991 Lexus LS 400 - Page 5 - Answered Questions & Fixed issues


Could be several things.
If the head gasket is blown, you may have lost compression in the cylinders. You may have also damaged the spark plugs with coolant.

1991 Lexus LS... | Answered on Jul 28, 2012 | 198 views


the starter is at the back of engine by the front of transmission on all cars.
ECU chip tunning tool

1991 Lexus LS... | Answered on Jul 03, 2012 | 52 views


The AC system probably needs checking for leaks and re-charging.

1991 Lexus LS... | Answered on Jun 23, 2012 | 90 views


Have you probed the tail/brake lamp socket to see if power is there or you just assume it is? also make sure the ground is good for the brake lights Do that if not done already and let me know.

1991 Lexus LS... | Answered on Jun 26, 2012 | 545 views


I have the exact same car that had the exact same problem. I looked high and low for months trying to figure out the problem. I changed the fuel pump, coil packs, spark plug wires, plugs, throtle position sensor and nothing fixed it. It would crank fine, but when it warmed up it would spit and sputter like it was running out of gas. It would shut off and would not crank back until it cooled off. The computers in those cars have something wrong with them causing it to starve the car for fuel. I sent my computer to Auto Computer Exchange in Davie Fl. They repogramed the computer with a one year warenty for $305. I put it in the car and It is fixed. One other thing that might happen with this car is the insturment cluster will go out. These cars are known for that. If this happens just go on Ebay and buy a rebuilt one for less than $100 it wil have a lifetime gurantee. good luck Ed

1991 Lexus LS... | Answered on Jun 22, 2012 | 929 views


Coul dbe a proble with the temperature sensor, go to bad or some wire/harnesses loss.

1991 Lexus LS... | Answered on Jun 20, 2012 | 67 views


should be Two. By the front of the motor.

1991 Lexus LS... | Answered on May 29, 2012 | 30 views


sounds like a head gasket or something with the heads, sorry =(

1991 Lexus LS... | Answered on Apr 22, 2012 | 89 views


More than likely the battery needs to be charged or replaced. If the battery is over five years old this is a strong possibility that it is bad. AAA will come to your location and test your battery, and charging system for free, if you are a member. They will also replace the battery at your location at a costs. I recommend that you become a member of AAA, as one towing, or service call more than pays for the annual membership fee.

1991 Lexus LS... | Answered on Apr 12, 2012 | 124 views


who makes the ls400? mercedes?

1991 Lexus LS... | Answered on Apr 06, 2012 | 154 views


Either fuel is dripping into cylinder after the ign is turned off or you have carbon built up on the valves or plugs and it it hot and ignites the air fuel mix when you turn ign off pull spark plugs and inspect.

1991 Lexus LS... | Answered on Apr 01, 2012 | 103 views


Hi Burnout, How do you know its the starter motor and not the battery or cables? Regards John

1991 Lexus LS... | Answered on Mar 31, 2012 | 313 views


fold down back seat and mess with the latch from the inside, its a tight squeeze but is possible in most cars.

1991 Lexus LS... | Answered on Mar 29, 2012 | 52 views


I always say try the easy first, have you looked in the manual that came with the car under fusses and found where the headlight fuse is in the fuse box and have checked it, take it out and hold to where you can see the wire inside the fuse to see if it is bad, if in doubt replace it.

1991 Lexus LS... | Answered on Feb 24, 2012 | 69 views


The sparkplugs are located inside the top of cylinder heads.if you follow the sparkplug wires to head you will see plugs. you will need to remove the top plastic engine covers to see them. good day

1991 Lexus LS... | Answered on Feb 17, 2012 | 127 views


Check the internal radio fuse or replace radio. If it is the internal fuse INSIDE the stereo itself, you will need to check the ground wires from the radio. Electrical problems are almost always caused by a bad or corroded ground wire somewhere.

1991 Lexus LS... | Answered on Feb 16, 2012 | 185 views


valve cover gasket

1991 Lexus LS... | Answered on Feb 15, 2012 | 97 views


Is it leaking any antifreze?

1991 Lexus LS... | Answered on Jan 29, 2012 | 22 views


Can some one tell me why dash lights flicke and dnt stay on i have a 93 ls 400

1991 Lexus LS... | Answered on Jan 24, 2012 | 605 views

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