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I agree a schematic of the vacum system would be a goldmine of troubleshooting knowledge.

trade secret This is just an maybe what you are getting at is a relatively simple series of 'IF THAN AND OR' decision trees that decides what sensor readings to use, and more importantly what to ignore, based on the sensor readings themselves. A seperate chip could be used for this and...

you can also make your own o2 sensor simulator by wiring in a 1K Ohm resistor in place of the oxygen sensor. that costs about 2 to 3 USD and they don't even have to be anywhere near the exhaust system.

make sure your AFM is properly connected and check all the ground points for the timing and trans computers. you may have a bad cat but only because it has been damaged from an underlying mixture problem

I'm still in I was one of the members who comitted to the group buy way back when. I have a different first gen LS now but i still need the same headers. JBrady, do you have any information on what work it will take to physically get these headers into our cars. getting some bends with...

I had and sold a 1990 LS400. Undoubtably the best car i will ever own. The 1990s have 18 gallon tanks and i got about 355-370 miles per 18 gallon tank on in town driving. It had 280,000 miles. My 1994 with 175,000 miles has a 20 gallon tank and i get no better than 265 miles to the tank. the...

Dead Dash HELP! A while back i came into the ownership of my second LS400. This one is a Gold 94 and has been kept in immaculate shape and serviced to excess by the lexus dealership. About a year ago a problem occored. Everything on the dash flashes when the car is warming up. When the car is...

If possible, take a pic of what you found under the seat and i'm sure someone if not I, will respond. The only traction control unit i know of sits under the hood adjacent to the throttle body. thats all the help i can give without a pic.