LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

how do i adjust TPS? 1990 ls400

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Old 11-30-09, 09:53 AM
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nervekiler
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Default how do i adjust TPS? 1990 ls400

hey guys
over the last month the car has been running great most the time.. and then really crappy part of the time.
when it runs bad sometimes the CEL comes on. checked the code and it brought back the TPS code.
i adjusted it a little more clockwise and seemed to fix the problem... for a day.
then the next day the problem came back.

the problem is that the engine will seem to start bucking and kicked shaking the car. mostly noticable at a stoplight. the RPMs also seem to be down from a normal idle ONLY when the problem is occurring.
during driving at part throttle the car will feel like its missing a little. hesitating until i either let off the gas completely for give it a lot more forcing the tranny to downshift.
it also seems to have lost quit a bit of power EVEN when the problem isnt occuring. but i wouldnt really know becuase i drive like a grandma and never get to WOT.

so my question is, how do i adjust the TPS? or even check it to make sure its completely operational? im fairly certain this is the cause of the problems because of the CEL diagnostics. if a proper adjustment doesnt help then i guess ill turn to the ignition system and fuel system next. but this is my first stop.

thanks in advance.
Old 11-30-09, 10:55 AM
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python
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feeler gauge and an ohm meter....u need to google for the exact specs though
Old 12-01-09, 06:20 AM
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LexLS
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See my tutorial: http://www.lexls.com/tutorials/EFI/tps.html
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