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Lexus RX 330 Maintenance and Repair

1744 messages,  Last post on Dec 08, 2009 at 11:04 AM

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#31 of 1744 ECM Update by lovemylexus1 Dec 23, 2003 (9:26 am)
I have mentioned in other posts on the various RX 330 discussion boards my experience with the ECM update.   I too had "funny" shifting issues. I had the ECM performed at my 1000 mile service. It has made such a difference that I don't even think I'm driving the same car. The transmission is smooth and my gas mileage is better.   I'm not a mechanic so I can't explain what the ECM does but I do recommend it highly if you have complaints about your transmission shifting.
#33 of 1744 Shift Problem and Engine Noise by tolexus Dec 24, 2003 (11:34 am)
My wife's RX330 (built in Japan) has 4,000 miles and suffers from rough down shifting and loud engine noise at idle. The dealer in Toronto says Toyota is aware of both problems. They "updated" the ECU last week. The transmission shifts faster but it still clunks and searches for the right gear at 20 MPH. They also said the engine noise is related to the manifold design - and nothing can be done to reduce the noise. Our '03 MDX is a much smoother/quieter vehicle.
#34 of 1744 Rough Shifting, Engine Noise in RX 330 by gardencar Dec 24, 2003 (5:05 pm)
I have just purchased a Neptune Blue/Ivory AWD RX 330 and have experienced none of the noises and shifting problems mentioned here. My wife and I are very happy with it, comfort, utility, and performance wise. It shifts smoothly and the engine feels powerful, yet quiet compared to our V8 Explorer. This may seem like comparing apples and oranges but we also have an LS400, compared to which the RX seems slower and noisier. My point is, that it is all relative. However, for our purposes, the RX fits the bill perfectly. My questions are, "Should I expect my RX to start acting up around two or three thousand miles, or is this happenning to just some vehicles? Does my car also need the ECM update at the 1K service? What are ECM and ECU acronyms for? Thanks for your inputs.
#37 of 1744 Rough Shifting by kcr2 Dec 24, 2003 (8:08 pm)
I had the same shifting problems. The ECM update was completed at 1000 mile service. It made a HUGE difference. Shifting is smooth from 1st to 2nd. The only thing now is a slight hesitation around 20 mph when I reaccelerate - but it's not as noticeable as it was before the update.
#38 of 1744 Slight Hesitation by gardencar Dec 24, 2003 (9:15 pm)
krc2, now that you mention it, I did have two instances of hesitation at around the 20 mph range when reaccelarating over a 500 mile period. I was puzzled because I pressed the accelarator without response. It happenned so quickly that I don't remember if I had to ease off the pedal and then step on it again, or if the power came on while I still had my foot on it. I hope the EMC update will take care of this.
#39 of 1744 Slight Hesitation by kcr2 Dec 25, 2003 (7:47 pm)
I've been told that the hesitation is due to the transmission searching for the correct gear. It's a shorter delay since I had the update completed. Plus I've learned over the last 3000 miles to reaccelerate a little easier after coasting at around 20 mph. When I accelerate too quickly, it hesitates and jerks into gear. It's only really noticeable in rush hour traffic or when I slow down to take a turn and reaccelerate. No problem otherwise.
#40 of 1744 Absent Minded Transmissons? by gardencar Dec 26, 2003 (12:03 am)
Kcr2, thanks again for answering yet another of my questions. Far as I'm concerned these are my only two concerns, the HID's and the absent-minded transmission. Guess these are just the pitfalls of buying first year production cars. Anyways, love the rest of the car.

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