Intermittent power loss
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Driver School Candidate
Joined: Jun 2020
Posts: 5
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From: 71000
Intermittent power loss
Hello to everyone...I have problem with my Lexus RX300 AWD, and my local garages and official dealers cant find solution.
1. I don't know is it linked problem, but sometimes car can't start up from first time and other days starts normally. Alternator charging is 13.4V on idle, but it keeps draining battery to 40%. What is correct alternator charging values for idle on this model?
2. The real problem is that car with 150kW sometimes acts like it has only 50kW. One day it drives like crazy and the other it lacks of power. Sometimes even in the same trip it lose power and gain it again during ride. No dashboard warning lights or codes.
I changed spark plugs, vacuum pipes, clean throttle body and MAF sensor. Charge battery to 100%. Engine, transmission, differential oil and filters changed. Here is some data on idle: Injector 2.5ms, IGN Advance 20.0 deg, CALC Load 14,90% , MAF 3.20 gm/sec, Engine SPD 700rpm, Coolant Temp 95 C, Intake Air 47 C, Throttle POS 15%, O2S B1 S2 0.740V, O2S B2 S2 0.720V, AFS B1 S1 3.28V, AFS B2 S1 3.29V, Short FT#1 2.31%, Long FT#1 -1.60%, TOTAL FT#1 1.028, Short FT#2 2.31% , Long FT#2 -0.82% , O2FT B1 S2 99.15%, AF FT B1 S1 1.00 , AF FT B2 S1 1.00 .
When it has no power, I noticed louder sound like engine struggles, lower fuel economy, harder or unable to reach 180kmh and next day it works just fine...lot quieter, faster, better fuel economy, easily reaching 180kmh and great throttle response. What should I replace or fix to enjoy ride again? Forwardly greatful
1. I don't know is it linked problem, but sometimes car can't start up from first time and other days starts normally. Alternator charging is 13.4V on idle, but it keeps draining battery to 40%. What is correct alternator charging values for idle on this model?
2. The real problem is that car with 150kW sometimes acts like it has only 50kW. One day it drives like crazy and the other it lacks of power. Sometimes even in the same trip it lose power and gain it again during ride. No dashboard warning lights or codes.
I changed spark plugs, vacuum pipes, clean throttle body and MAF sensor. Charge battery to 100%. Engine, transmission, differential oil and filters changed. Here is some data on idle: Injector 2.5ms, IGN Advance 20.0 deg, CALC Load 14,90% , MAF 3.20 gm/sec, Engine SPD 700rpm, Coolant Temp 95 C, Intake Air 47 C, Throttle POS 15%, O2S B1 S2 0.740V, O2S B2 S2 0.720V, AFS B1 S1 3.28V, AFS B2 S1 3.29V, Short FT#1 2.31%, Long FT#1 -1.60%, TOTAL FT#1 1.028, Short FT#2 2.31% , Long FT#2 -0.82% , O2FT B1 S2 99.15%, AF FT B1 S1 1.00 , AF FT B2 S1 1.00 .
When it has no power, I noticed louder sound like engine struggles, lower fuel economy, harder or unable to reach 180kmh and next day it works just fine...lot quieter, faster, better fuel economy, easily reaching 180kmh and great throttle response. What should I replace or fix to enjoy ride again? Forwardly greatful
13.4V while within spec, is low for any toyota alternator I've worked with. Mine are usually 13.8-14.2V depending on model measured at the battery with the car running. 12.6V for a cold battery.
I have a suspicion it's electrical related but I don't want you to throw parts at it. But alternator or battery or even both may be the fix.
I have a suspicion it's electrical related but I don't want you to throw parts at it. But alternator or battery or even both may be the fix.
Thread Starter
Driver School Candidate
Joined: Jun 2020
Posts: 5
Likes: 1
From: 71000
Thanks for quick reply. Battery is around 12.6V with engine off. I bought new brushes for the alternator but didnt change it yet, but I guess there are some diodes problem too. I will try that first. Any other suggestions are welcome too.
Lexus Champion
Joined: Apr 2019
Posts: 11,227
Likes: 1,589
From: FL
Hello to everyone...I have problem with my Lexus RX300 AWD, and my local garages and official dealers cant find solution.
1. I don't know is it linked problem, but sometimes car can't start up from first time and other days starts normally. Alternator charging is 13.4V on idle, but it keeps draining battery to 40%. What is correct alternator charging values for idle on this model?
2. The real problem is that car with 150kW sometimes acts like it has only 50kW. One day it drives like crazy and the other it lacks of power. Sometimes even in the same trip it lose power and gain it again during ride. No dashboard warning lights or codes.
I changed spark plugs, vacuum pipes, clean throttle body and MAF sensor. Charge battery to 100%. Engine, transmission, differential oil and filters changed. Here is some data on idle: Injector 2.5ms, IGN Advance 20.0 deg, CALC Load 14,90% , MAF 3.20 gm/sec, Engine SPD 700rpm, Coolant Temp 95 C, Intake Air 47 C, Throttle POS 15%, O2S B1 S2 0.740V, O2S B2 S2 0.720V, AFS B1 S1 3.28V, AFS B2 S1 3.29V, Short FT#1 2.31%, Long FT#1 -1.60%, TOTAL FT#1 1.028, Short FT#2 2.31% , Long FT#2 -0.82% , O2FT B1 S2 99.15%, AF FT B1 S1 1.00 , AF FT B2 S1 1.00 .
When it has no power, I noticed louder sound like engine struggles, lower fuel economy, harder or unable to reach 180kmh and next day it works just fine...lot quieter, faster, better fuel economy, easily reaching 180kmh and great throttle response. What should I replace or fix to enjoy ride again? Forwardly greatful
1. I don't know is it linked problem, but sometimes car can't start up from first time and other days starts normally. Alternator charging is 13.4V on idle, but it keeps draining battery to 40%. What is correct alternator charging values for idle on this model?
2. The real problem is that car with 150kW sometimes acts like it has only 50kW. One day it drives like crazy and the other it lacks of power. Sometimes even in the same trip it lose power and gain it again during ride. No dashboard warning lights or codes.
I changed spark plugs, vacuum pipes, clean throttle body and MAF sensor. Charge battery to 100%. Engine, transmission, differential oil and filters changed. Here is some data on idle: Injector 2.5ms, IGN Advance 20.0 deg, CALC Load 14,90% , MAF 3.20 gm/sec, Engine SPD 700rpm, Coolant Temp 95 C, Intake Air 47 C, Throttle POS 15%, O2S B1 S2 0.740V, O2S B2 S2 0.720V, AFS B1 S1 3.28V, AFS B2 S1 3.29V, Short FT#1 2.31%, Long FT#1 -1.60%, TOTAL FT#1 1.028, Short FT#2 2.31% , Long FT#2 -0.82% , O2FT B1 S2 99.15%, AF FT B1 S1 1.00 , AF FT B2 S1 1.00 .
When it has no power, I noticed louder sound like engine struggles, lower fuel economy, harder or unable to reach 180kmh and next day it works just fine...lot quieter, faster, better fuel economy, easily reaching 180kmh and great throttle response. What should I replace or fix to enjoy ride again? Forwardly greatful
Any codes?
Thread Starter
Driver School Candidate
Joined: Jun 2020
Posts: 5
Likes: 1
From: 71000
No, there are no codes. This problem is more than 6 months old so I think it would be some error codes but there is nothing on dashboard or on Techstream. I will try to check cats with hammer. I dont know what else to try. Thanks!
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Thread Starter
Driver School Candidate
Joined: Jun 2020
Posts: 5
Likes: 1
From: 71000
Thanks.It would be great way to check it for sure.Do you have any photo of A/F sensor location so I can be sure to remove the right thing. Forwardly greatful.
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