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Lexus Forum: diagnosis, cost?
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Old 07-12-2016, 12:59 PM
lexussc92 lexussc92 is offline
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Default diagnosis, cost?

92 sc300, 5 speed; at idle, sudden increase in rpm, then a drop, almost a stall, then increase again.... when driving, luurching occurs, ,almost stall then smooth for maybe 30 seconds and repeats...

i am thinking fuel pump? or maybe computer part related to fuel injection control?

appreciate any help with diagnosis and cost of parts and labor; car has 224000 miles...


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Old 07-13-2016, 02:39 PM
Lexus LS Owner Lexus LS Owner is offline
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Default Re: diagnosis, cost?

It might also be your mass air flow sensor. Try disconnecting it and see if the car runs better. If it does, then the mass air flow sensor is either dirty and needs to be cleaned or it needs to be replaced. I'm not sure this is what's causing your problems but it's an easy fix if it does happen to be the culprit.
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