Sc300 bucking and losing power
#1
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Join Date: Oct 2015
Location: California
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Sc300 bucking and losing power
Hello I have a problem with my sc300 5 speed it's keeps bucking and losing power. It happens randomly most of the time it would drive fine some times it would cut out when I go wot. But today it was cutting out really bad to the point where I can barely move I couldnt go over 2k rpm. I've done maintenance to it recently and thought it would fix the problem.
Things I've done
Tps sensor
Spark plugs
Cap and rotor
Spark plug wires
O2 sensor
Fuel filter
egr
Please help me out with some ideas or input
Things I've done
Tps sensor
Spark plugs
Cap and rotor
Spark plug wires
O2 sensor
Fuel filter
egr
Please help me out with some ideas or input
Last edited by integgy; 03-20-16 at 10:57 PM.
#3
Moderator
iTrader: (5)
^^ That could be it. Hard to tell without physically removing one or both of the cats and inspecting them or unless your ECU throws a code.
If it turns out that is your problem, read through this thread since you're in California and I assume you have a Cali-Spec model. If you have a Federal model that was brought into California then your options are slightly different.
https://www.clublexus.com/forums/sc-...nia-legal.html
You've changed out most of the major sensors already. Still a possibility.
You might also check into your EGR system to see if it's become clogged in any of the passages or valve ports (not an easy task) but with the 2k rpm limiting symptom you describe I'd say the EGR system is a very low probability as a culprit. The catalytic convertor is what I'd check into first.
If it turns out that is your problem, read through this thread since you're in California and I assume you have a Cali-Spec model. If you have a Federal model that was brought into California then your options are slightly different.
https://www.clublexus.com/forums/sc-...nia-legal.html
You've changed out most of the major sensors already. Still a possibility.
You might also check into your EGR system to see if it's become clogged in any of the passages or valve ports (not an easy task) but with the 2k rpm limiting symptom you describe I'd say the EGR system is a very low probability as a culprit. The catalytic convertor is what I'd check into first.
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