Rattling Noise in my Engine

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06-27-11, 07:19 PM

#16

HtownBlue

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Quote:

Originally Posted by calticboy

Man this is annoying...check engine is now appears...and it seems that my car is still loosing power after changing the spar-plugs.

If you use sub par plugs, or if the coils were not placed properly back on,(which in the rear is actually easier to do than you might think because of the angle you have to press them back on the plug) or if you failed to connect the coil wiring harness properly to the wires, you could have a cylinder that is misfiring.

I would bet you have a misfire in cylinders 2,4, or 6 which I think are the rear cylinders.
Sounds like a possible misfire to me friend.

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06-28-11, 06:38 AM

#17

lexus114

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Quote:

Originally Posted by sktn77a

The RX300 is spec'd to work with 87 octane gas without pinging (its in the users manual). Higher octane gas allows the ingnition timing to be advanced by the computer for more power but the car works fine on 87 octane. They could have used the wrong temperature plugs. Whatever the cause, it appears to be emanating from the plug change so you need to have them go over this gaian and make sure they used the correct (iridium) plugs. Remember those plugs on the rear bank are a b_tch to change so they may have installed them incorrectly.

People keep saying that on here, but you will have carbon issues to deal with later down the road.

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06-28-11, 07:35 AM

#18

sktn77a

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Quote:

Originally Posted by lexus114

People keep saying that on here, but you will have carbon issues to deal with later down the road.

Not sure why this would be the case (?)

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06-28-11, 09:48 AM

#19

calticboy

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I brought the car in the garage. They mention something "engine - picking"...i don't know what that means but theirs another lexus in the garage that has the same problem with mine (model ES).

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06-28-11, 09:54 AM

#20

lexus114

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Quote:

Originally Posted by sktn77a

Not sure why this would be the case (?)

Does not burn the lower octane fuel properly. Leaving too many deposits behind in the combustion process. They say 91 or higher recommended for a reason. But I guess they didnt want to scare people off buy saying only. The 87 is just enough octane for the motor to run on, and thats about all. Dont expect much performance from it then, i.e passing power,pulling steep grades,towing anything. And over all performance in general, especially in hot weather.

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06-29-11, 06:22 PM

#21

calticboy

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ok guys, this is the code that the garage read when the check engine appears its P0171 Bank #1...and i don't know what it means. Anyway, i would like to thank everyone for all your replies, i used them to convince the mechanic to change all the 6 spar-plugs free of charge. The previous plug that they put are NGK Iridium...now i have the original plugs from the dealer. So far of 2 hours driving no rattling noise.

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