Top 20 1990 Lexus LS 400 Questions & Answers

Front of intake on the drivers side see link DIY Coolant Temperature Sensor change PICS Club Lexus Forums

most probably a torn lower suspension arm rubber bush that would not show up if the car was on a 4 post hoist there is a problem there as the noise would not be evident if there was nothing wrong different tire pressures will give different noise when hit with a tire lever ( a trick used by truck drivers to check for flat/ under inflated tires good tire solid sound low pressure tire a dull sound

Remove the rear seat to access the fuel pump cover.

need to have the car scanned but posible internl problem on the transmission

Check the linkages between gear shift and Box could be loose. If these are OK get a transmission service by a good Auto Transmission shop

It seems no one knows the answer. It may be a circuit breaker instead of a fuse. Or maybe a fuseable link. I found several YouTube videos on replacing the motor, or replacing a plastic gear that's part of the system. If you watch them, it may point you to an answer.

Hi Jorge. Por ahora, s?lo conduce a la misma velocidad que todos los otros conductores. En ese a?o, un problema com?n estaba poniendo demasiado lubricante en el cable del veloc?metro, causando que se pegue. Golpe? el tablero de la rociada unas cuantas veces y ver si eso lo har? correr. Quiz? deba reemplazar el racimo del instrumento. A veces se encuentran disponibles en los patios de demolici?n del autom?vil.

And what do the o2 sensors say now when scanned?

One filament, in the bulb, is burned out. remove the bulb, look through it and see if it has two filaments. replace if necessary.

Clearing the codes is simple that is done by removing the fuse of the EFI from junction box 2 for 10 seconds. Make sure to remove the jumper wire and switch the key off before clearing the codes. Here are some common Lexus vehicles 1990-1995 codes: Code 12 and Code 13 Rpm signal circuit fault Code 14 Igniter signal circuit fault Code 16 ECT control signal fault Code 21 and Code 28 Main oxygen sensor fault (for ES300; SC300 & GS300 models) Code 22 Coolant temperature circuit fault Code 24 Intake temperature sensor circuit fault Code 25 and Code 26 Air fuel ratio fault (for ES300 & SC300 models) Code 27 Sub-oxygen sensor circuit fault (for ES300 CA & GS300 models) Code 31 Low airflow meter voltage (for ES300 and GS300 models) Code 32 High airflow meter voltage (for ES300 model) Code 35 Barometric pressure sensor circuit fault (for GS300 & SC300 models) Code 41 and Code 47 Throttle position sensor circuit fault Code 42 Vehicle speed sensor circuit fault Code 43 Starter signal Code 51 Switch condition signal fault (for ES300; GS300 & SC300 models) Code 52 Code 52 and Code 55 Knock sensor circuit fault Code 71 EGR system circuit fault (for ES300; GS300 & SC300 models) Code 78 Fuel pump control circuit fault (for GS300 & SC300 models)

Most car alarm and stereo installers may be able to help you. I took apart the driver's door lock on one vehicle, removed the tumblers and reassembled it but eventually someone messed with it and I was stuck

Yes if it has a program key

Water or contaminants in the fuel system or possibly a bad plug wire? It can also have developed a vacuum leak at the intake manifold or an emissions system failure is possible first check your sparkplug wires that's the cheapest route! I feel like it might just be a plug wire is broken and is jumping spark or the timing belt may be stretched? Look at your mileage if around 100,000 miles then plugs and wires may be at fault? If you need further help, reach me via phone at https://www.6ya.com/expert/james_8f14c50d9c6cdea8

Have your catillac converter checked out

check for spark from the spark plug wire pull the plug wire put a screw driver in the wire hold it by the plastic handel so the shaft of the screw driver is close but not touching a ground and watch for a spark be careful not to get shocked or see if the fuel pump is bad sometimes you can hit the gas tank with your hand while you turn the engine over you have to hit hard and fast while trying to start it this means the fuel pump is bad if it starts because it will stop again

Best bet is the it to a toyota dealershipnor Napa and have them hook up the computer. They will tell you if your timing is off.

Please check plugs, plugs wires and distributor connection

Check your brake wires connections because it seems that some wires are inccorectly installed and need to to inspected and refixed

Go to Car-Part.com-it is a nationwide locator of used car parts. Otherwise, try ebay or Amazon, and search on there.

If u have repaired coolant problem and light well not reset. Problem is not fixxed then. Look for something minor like cap on not holding correct pressure overflow tank has a sensor inside that may be bad.