mystery issue..
#18
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So the issue is back again.. I tried disconnecting connector to the selenoid that opens the secondary flap. This essentially leaves the flap open all the time, not just above 3400 rpm. Even with the connector disconnected the high end growl is significantly reduced (as is power). It is completely random, sometimes it growls other times it does not.
Can the vvti be the culprit? Still no CEL..
Can the vvti be the culprit? Still no CEL..
#19
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So the issue is back again.. I tried disconnecting connector to the selenoid that opens the secondary flap. This essentially leaves the flap open all the time, not just above 3400 rpm. Even with the connector disconnected the high end growl is significantly reduced (as is power). It is completely random, sometimes it growls other times it does not.
Can the vvti be the culprit? Still no CEL..
Can the vvti be the culprit? Still no CEL..
#21
Lexus Champion
iTrader: (3)
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Sorry to see this fella. ![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
Hope you get it fixed soon.
I know these are very sensitive cars though. When I was doing an Apexi throttle controller install for another forum member over here, I accidentally plugged one of the connections in the wrong way round (in fairness, there are no markings I could see, so was a 50/50 gamble). Car through a CEL, other warning lights, went into limp mode etc. I was freaked! Changed the connection around and still not right. Decided to disconnect the battery and reset everything. Worked perfectly after that.
Appreciate you've tried this with limited success. Just hope it's nothing too serious for you mate.
Best of luck!
![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
Hope you get it fixed soon.
I know these are very sensitive cars though. When I was doing an Apexi throttle controller install for another forum member over here, I accidentally plugged one of the connections in the wrong way round (in fairness, there are no markings I could see, so was a 50/50 gamble). Car through a CEL, other warning lights, went into limp mode etc. I was freaked! Changed the connection around and still not right. Decided to disconnect the battery and reset everything. Worked perfectly after that.
Appreciate you've tried this with limited success. Just hope it's nothing too serious for you mate.
Best of luck!
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
#22
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No response from the dealer, i followed up today.
Since the F is my weekend ride i had not had a chance to drive it until today. Once again it lost it''s grunt on the high end. I tried adding NOS octane booster (claims to add 3 octane points) and i filled up with fresh 93 octane. A few WOT runs later, power is back to normal..could bad gas cause such a dramtic loss in performance?
Since the F is my weekend ride i had not had a chance to drive it until today. Once again it lost it''s grunt on the high end. I tried adding NOS octane booster (claims to add 3 octane points) and i filled up with fresh 93 octane. A few WOT runs later, power is back to normal..could bad gas cause such a dramtic loss in performance?
#24
Lexus Test Driver
iTrader: (1)
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..............sounds like your MAF sensor is dirty or getting air turbulence. Try cleaning it, reset the ECU again. Check for any loose clamps before the MAF....that may be causing an unbalanced mixture.
This is an easy thing for you to rule out, and dealers never provide this check, without throwing parts at the problem.
Digger08
This is an easy thing for you to rule out, and dealers never provide this check, without throwing parts at the problem.
Digger08
#26
Tech Info Resource
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iTrader: (2)
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Everything was fine until an oil and filter change? What is keeping you from having them drop the oil, and put in the right stuff? VVTi on the exhaust side is controlled by oil pressure. If they didn't put the right oil in it, it won't work right and the car will run like crap. A good friend had a GS430 with exactly the experience you have, and it turned out to be the oil causing the issue. Oddly enough, he ran Mobil 1 and had problems for more than a year. He put in the Toyota oil they sell in the parts department, and the mystery power loss issues disappeared.
Drain the oil. Put something different in it. Test. Bet it's fixed.
Drain the oil. Put something different in it. Test. Bet it's fixed.
#28
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Everything was fine until an oil and filter change? What is keeping you from having them drop the oil, and put in the right stuff? VVTi on the exhaust side is controlled by oil pressure. If they didn't put the right oil in it, it won't work right and the car will run like crap. A good friend had a GS430 with exactly the experience you have, and it turned out to be the oil causing the issue. Oddly enough, he ran Mobil 1 and had problems for more than a year. He put in the Toyota oil they sell in the parts department, and the mystery power loss issues disappeared.
Drain the oil. Put something different in it. Test. Bet it's fixed.
Drain the oil. Put something different in it. Test. Bet it's fixed.
#29
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Everything was fine until an oil and filter change? What is keeping you from having them drop the oil, and put in the right stuff? VVTi on the exhaust side is controlled by oil pressure. If they didn't put the right oil in it, it won't work right and the car will run like crap. A good friend had a GS430 with exactly the experience you have, and it turned out to be the oil causing the issue. Oddly enough, he ran Mobil 1 and had problems for more than a year. He put in the Toyota oil they sell in the parts department, and the mystery power loss issues disappeared.
Drain the oil. Put something different in it. Test. Bet it's fixed.
Drain the oil. Put something different in it. Test. Bet it's fixed.
![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)