1luckyjohn

I have had continuing problem with my 1998 gs300 lexus . Seems to happen when i slow down or am in stop start traffic .Vsc and engine lights come on and throttle response reduces to about the last 25% of travel. When this first happened the car returned to normal when the ignition was swithed off and turned on again, but after doing this in response to the problem maybe 6 or so times ,switching off the ignition and turning on again did not reset the throttle and turn off the warning lights. So we plugged in the computer code reader and it came up code for TPS so we bought a new TPS from Lexus and fitted it and had no problems for a 1000 miles or so, but now its back doing the same thing and i can almost pick when its going to do it which is when i slow down and or change direction .Now when it does it and we check for codes there are none and it always resets and carries on fine by just tuning off ignition and switching it straight back on again.PLEASEEEEE has anyone got to the bottom of this pproblem and worked out why it is happening. I know that when it occurs the electronic butterfly in throttle body is not responding and so only the cable operated portion is left to give you acceleration. You can mimic the problem by disconecting the plug on the electronic butterfly.HELPPPPP.

I have an automotive shop and dealership.  My 2001 gs300 with 52000 miles has given me no trouble until 3 weeks ago.  While going up a hill I felt a slight pop in the accelerator pedal.  The pedal went almost all the way to the floor (past 75%) before the car had any power.  I pulled over and checked everything.  I got back in the car and cranked it back up.  The vsc and cel were still on, but I did have full accelertor pedal.  This was fine for about 2 miles until I tried to merge onto the interstate and the same thing happened again.  I almost became a hood ornament on a Mack truck.  I pulled and repeated the same procedure and again full pedal returned.

I got the car back to my shop and pulled up the following codes: p0753, p0758, p0763, p1126, p1656.  We have replaced the throttle body assemble twice thinking that might be the problem.  We have also traced all the wires from the ecu to the throttle body looking for an open or short.  This car has never been in an accident. 

Please help.  If someone has experienced this same problem please let me know.  Your help will be greatly appreciated.  THANKS!!!!!!

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