1991 Lexus LS 400 - Page 8 - Answered Questions & Fixed issues


Have the timing checked out. If it is off a couple of teeth, the engine should run, but will die when warmed up. Your 8 Cylinder uses a timing belt with a hydraulic belt tensioner. If the tensioner is leaking, or worn from old age, the belt may jump a couple of teeth. I believe your engine is an interference engine. If the belt has slipped, it is possible you may have bent valves, or worse.

Just wondering, when the engine dies on you while driving, does it start right back up, or does it start up only after cooling down?

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

1991 Lexus LS... | Answered on Apr 08, 2011 | 325 views


there is an emergency latch on the inside, only suggestion I have is to open your rear seats and try and open it from here, it may be sealed shut.

1991 Lexus LS... | Answered on Mar 24, 2011 | 146 views


More than likely small plastic clip that attaches exterior door handle to mechanism has come loose or is broken, It's a .29 part but almost $200 in labor (door panel removal, etc..)

1991 Lexus LS... | Answered on Mar 24, 2011 | 117 views


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Most likely have broken wires in the driver side trunk hinge. Splice/solder in some new wire and tape it and the problem will most likely be fixed. It is an incredibly common problem with the gen 1 LS400.

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If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

1991 Lexus LS... | Answered on Mar 25, 2011 | 182 views


CRANK POSTION SENSOR OR CAMSHAFT SENSOR ,IF THERE BAD IT WILL NOT CRANK AT AL

1991 Lexus LS... | Answered on Mar 09, 2011 | 56 views


Call the Dealer you purchased the car from, and have them walk you through it. Act as if you are stuck in the middle of nowhere.

1991 Lexus LS... | Answered on Mar 09, 2011 | 357 views


The main purpose on an alternator is to recharge current back to the battery. One of the most common problems with the Lexus LS400 and SC400 is that power steering pump seal leak. Right below the power steering pump is the alternator. The power steering fluid will drip down and cause many electrical problems for the alternator. Therefore, its very common to have the alternator go bad along with the power steering pump, just be sure to check.awcforever.gif

1991 Lexus LS... | Answered on Mar 07, 2011 | 767 views


need to take belt off and spin each pulley by hand to make sure they all spin freely and also look and make sure when belt broke that it did not cut a wire or something like that

1991 Lexus LS... | Answered on Mar 04, 2011 | 85 views


sounds like the fuel filter is bad or the throttle position sensor is going bad.

1991 Lexus LS... | Answered on Feb 28, 2011 | 676 views


Have you scanned the wires?

1991 Lexus LS... | Answered on Feb 13, 2011 | 46 views


The vehicle is 20 years old its likely a contact problem to one of the motors or a control switch . Start wiggleing wires around and checking there contacts . its likeky nothing big or expensive its just getting old good luck

1991 Lexus LS... | Answered on Feb 13, 2011 | 46 views


SOUNDS LIKE THE BATTERY IS SHOT AND NEEDS REPLACING. MOST BATTERIES AVERAGE BETWEEN 2-4 YRS. I'VE SEEN SOME BATTERIES ONLY LASTING A LITTLE MORE THAN A YEAR. DEPENDING ON HOW YOU USE THE VEHICLE, MATTERS HOW LONG A BATTERY CAN LAST. IF YOU SIT & IDLE THE VEHICLE WITH THE A/C ON,FAN AT HIGH SPEED, LIGHTS ON, STEREO RUNNING WILL SHORTEN LIFE CAUSE THERES NOT ENOUGH ALTERNATOR SPEED TO CHARGE THE BATTERY. REMEMBER, WHAT VOLTAGE IS CONSUMED BY THE VEHICLE, THE ALTERNATOR REPLACES THE VOLTAGE BACK INTO IT AND MAINTAIN. PROVIDING YOU DON'T HAVE A RED BATTERY WARNING LIGHT ON THE DASH WHILE DRIVING, IT'S SAFE TO SAY THAT THE ALTERNATOR IS CHARGING. BUT YOU SHOULD HAVE THE CHARGING SYSTEM CHECKED ON YOUR CAR TO ENSURE PROPER OPERATION. GOOD LUCK.

1991 Lexus LS... | Answered on Feb 10, 2011 | 210 views


idle air control valve or throttle position sensor depending on your vechile

1991 Lexus LS... | Answered on Feb 07, 2011 | 114 views


ck relay to fuel pump bad

1991 Lexus LS... | Answered on Feb 06, 2011 | 542 views


The first year was 1990. the MSRP was $36,000

1991 Lexus LS... | Answered on Feb 05, 2011 | 104 views


behind the break light housing inside the trunk

1991 Lexus LS... | Answered on Feb 01, 2011 | 67 views


Yes it is true, I believe there are 4 cats on that car. burn the correct fuel in it and it will run better and not clog your cats, that car takes premium gas.

1991 Lexus LS... | Answered on Jan 31, 2011 | 292 views

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