CRAB

I don't like the idea of using additives in my combustion chamber to "break down lots of carbon". Where's it going to go? I bet my failed cat could tell you. By the way, dealer cost to replace a cat is $2k each and you have 4 of them. Probably not a big deal with a low mile car that doesn't burn oil or a car that isn't so picky such as my '68 and '73 Bronco. Just my opinion........

LexiLex

Is the the slight vibration that I feel when I roll the windows up, turn on my lights or press the breaks? Or is this something else?

yoondog

iTrader: (2)

Finally had time to drop off my car after getting this letter a few months back. Also got my 85k oil maintenance service as well since I had the prepaid service on it. Technician said he test drove it and found the rough idle. They have to replace something in one the pistons and that it would take a couple of days. I got a 2013 GS350 loaner which I'm in love it!

fventura03

happened to me once (rough idle), but it only lasted like 5 seconds, VSC Light/CEL went on, haven't seen it since.

aett258

It's been 1k miles later. They added oil and asked me to come back in another 1k miles. Here we go again. Hope they recognise that this is a latent defect with thier piston rings and fix it at no cost. I hope they treat us Canadians similarly like they did in the States. I did not mention the US CSP or anything else. I will wait to see what they tell me 1k miles from now. I will keep you posted.

BinaryJay

Thanks for the update. I'm really interested in knowing what they end up doing for you, please PM me when you update if you remember.

fventura03

wow, this sounds like something mine is doing, 1500 miles ago i checked my levels, seemed ok. i checked two days ago because my oil light was going on, i had to add 2 quarts. not sure if i mis-read the dip stick, or i am burning oil.

car has 160k miles, if this keeps up, going to have to take it in to lexus...

G0DZULU

Nalley Lexus of Roswell, Ga told me that there is carbon buildup and said it would be a charge to remove. Blew the letter off as nothing important.

ibidu1

iTrader: (1)

Try speaking to the Service manager, if no luck go to another dealer.

01gs3

iTrader: (10)

Read through the thread and I may have overlooked it, but what if you never received a letter? My wifes car was bought from a private party and experiences the misfire symptoms.

Just contact Lexus Corp. And ask?

06 GS300 rwd 134k mi.

ibidu1

iTrader: (1)

Just take it to the dealer, and tell them

aett258

Found this on the IS forum which is similar to the GS issue regarding oil consumption and what the dealer does in regards to the test. From service bulletin L-SB-0124-12:
Perform an oil consumption test to determine the consumption rate.
1. Confirm the engine oil level is full.
2. Mark the oil dipstick to indicate the current level.
3. Replace the oil dipstick.
4. Mark the oil dipstick, oil drain plug, and oil fill cap to prevent/indicate tampering during the test.
HINT
Use tape, sealer, cable ties, or equivalent to mark the oil dipstick, oil drain plug, and oil fill cap.
5. Advise the customer to drive the vehicle normally for 1,200 miles and return for inspection

Diagnostic Procedure B (Continued)
6. Determine the quantity of oil that was consumed in 1,200 miles.
Was the oil level more than 1 quart low after 1,200 miles of normal driving?
• YES — Go to the Repair Procedure.
• NO — This bulletin does NOT apply. Warranty guideline for acceptable oil consumption is
1 quart per 1,200 miles of operation. No warranty claim should be filed.

01gs3

iTrader: (10)

Thanks, I appreciate the tip.

joeandchar

I got mine back from the dealer today. They also replaced the valve springs. Here are my initial impressions:

1. The insane valve noise is gone.
2. The throttle reaction seems much better.
3. My fuel mileage has increased about 4 MPG.
4. The engine seems much smoother under load.

It still has a "stumble" when cold, so I may have another issue that I will need to address.

Many thanks to Tom William Lexus for doing this for me. It has restored my faith in Lexus.

Janet512

I been having this problem for over a year, three trips to the dealer and they tell me my car is fine and blame it on the rims i have on.

This is so annoying....