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Hi, I put a new stereo and and Amp and Subs in the car but I am getting a high pitch noise from speakers. When you accelerate the noise gets louder. Any ideas ? Thanks

Problem was caused by a bad coil. Another problem was I had a Mass Air Flow code and check engine light , That problem was caused by a loose connection from the connector to the ecu. I suggest everyone checks the wires individually at the connection FIRST !!!!

Problem was a bad coil ...................

OK, I found it !!!!! Hope this helps alot of people. Since I had sent the ECU out to be fixed. I didnt put the carpet back down or cover the ECU. So after the Lexus dealership swapped the coil with a new one and fixed it , we drove it home and all Holy crap happened. Knowing that the last...

:mad:Ok, this is going to sound really weird. (1992 SC400) 4.0 L I had a big problem of not running good and no power. I put in a new fuel pump,coded check engine light to maf (swapped one from a junk yard). Did some diagnostics and it said that the ECU needed to be replaced. I sent the ECU out...

OK , HERE IT IS !!!!! It was a bad coil .......................So if your car is hard to start and runs like a bag of crap and has no power...... change the coils. My check engine light is still on and it codes out to be the maf . I tried swapping it with one from a junk yard but it still...

it is a sc400 1992. i changed the thermostat and antifreeze did splash on motor. then it started then it ran fine for a while . and then it started running terrible again.

yes, i got one out of a junk yard and the car runs exactly the same.

I coded out MAF and air temp control sensors( they are combined in MAF). After diagnosing it says that I need a new ECU. I sent the ECU to Foreign Auto Computer Repair, Inc. in florida. I got them off the web. They sent it back and said that they fixed something(leakey acid damage). I...

Code will come back and yes , I have run it without the maf plugged in, it runs exactly the same (shity) . I pulled the plugs and they are fouled because of too much fuel being dumped in there. (5+ms the injectors are staying open).

I tested the maf. , got 5 volts with no resistance , 5 pins on it. 2 wires - B (brown) wires = ground . 1 y-b ( yellow w/ black stripe) 2.5 volts, 1 y-g (yellow w/green stripe) 5 volts. 1 L-R (light blue w/red stripe) 5 volts. I tested volts at the ecu as well and got the same. Flow chart...

i had the same problem. It was bad plugs. Now my ECU is gone I believe. The code came up as Mass air flow but I am getting 5 volts with no resistance. So the flow chart says it is the ecu

looking for what the resistance of wires and of sensor, what should they be disconnected and connected at the sensor and at the ecu . I swapped the sensor and I have the same problem so I want to test they sensor, the wires going ot the ecu and the voltages. I just don't know what the readings...

the check engine light coded 24 and 31. Mass air flow and air temp control. Air temp I guess is part of the mass air flow. I swapped mass air flow and same problem. I need to know the input and out put voltages at the mass air flow and at the ECU to test . Does anyone know this...

Hope this helps someone. I bought my son a 1992 Lexus sc400 and the drivers side headlight gets condensation on the inside (have not found a solution yet). Both headlights were yellowish and foggy and car did not light up the road very well. I used 2000 grit sand paper and WET sanded...

gloverman, thank you very much. First time on this site but I will try to get back and let you know how I made out. Thanks again !

Any further help is appreciated. and does anyone know of a good tech in Massachusettes

they tried hooking up under the dash. No check engine light was on. but they came up with only the low volume on the fuel pump. So I put in a new one. Still same problem. Then he said he couldn't get anything off of the computer but said that it was dumping excessive fuel into the car and it was...

thanks very much. I will let them know and hopefully give it a shot. I just bought this car for my son and it was great. I put brand new snow tires on it 4 days ago, I wish I had waited.

ok, I will , thank you