Last post on Mar 05, 2010 at 9:48 AM
You are in the Lexus RX 300/330/350
What is this discussion about?
Safety Technology, SUV
#8 of 17 Re: Unintended Acceleration [dkshdws]
Apr 01, 2009 (7:05 am)
Get a different car.
#9 of 17 Re: Unintended Acceleration [jayvis]
Apr 01, 2009 (11:29 am)
The money has already been spent and "getting a different car" simply passes the problem on to the next unsuspecting person, i.e. there is no resolution.
SUVs and Smart Shopper
#10 of 17 Re: Unintended Acceleration [tidester]
Apr 01, 2009 (11:13 pm)
I agree... I'd be determined to keep trying to get to the bottom of it, too.
It doesn't have an aftermarket cruise, alarm, obstruction (carpet, plastic panel, loose bolt, cable, clamp, misplaced heater duct, tire iron, water bottle) or anything like that? I know it sounds extremely silly to look for the obvious, but it could be anything. If there's anything else like a throttle cable or cruise servo, or even the engine cover or throttle itself... It could be anything from the pedal to the EFI.
I'd be determined to find it right away, rather than in fear of it being unsafe. Maybe a search on the Tacoma forum might reveal if other owners of that model had a problem, and their solution. What if it is inherint in an electronic drive-by-wire? That surely would come up by now, unless you're the first person it's happened to.
I hope you find your culprit. I'm pretty sure you will now that you have the incentive of a possible runaway truck. But it's most likely to be something obvious. But I feel for you.
My mom had two Mavericks! They both had differing "runaway" car problems. The '70 250CID I6 and a '72 "GRABBER" 302 V8. A combination of a weak auto shift linkage and hand brake that couldn't hold the car on level ground no matter how hard you pulled, and a very determined idle. My mom didn't learn with the first one, and got another that was worse because it had the torque to pin you in after it fell in "Drive" or "Reverse" as you were getting in or out of an idling car. One time, I heard my mom screaming, and there were 4 big guys from her apartment building picking up the rear of the car. It was off the ground running in gear. When they dropped it back on the ground, it ran into the apartment building. They were busy little cars. Ford's fix came in the mail, unsolicited. It was an ugly sticker you're supposed to stick on the dash. It said something like "Do not leave any car idling in Park".
Then there's my dad's '70 Hornet SST. I was a 15 year old with a learner's permit when the Hornet's throttle cable broke. The pedal fell under my foot, and I pried my foot under it. But it was loose and so was the engine. The throttle opens all the way when the cable breaks on many old models. The car lept forward, chirped in "first" and right through a red light in a busy section of the San Fernando Valley. It screamed at redline 1-2, then into 3rd. I was going 75 before I got the ignition to cut. I couldn't believe they could make cars that way, even as a youngster. And it didn't have "power" brakes, either. Those were the days. Not trying to belittle the concern for safety. I wouldn't want to put up with it, either. I'm curious to hear about it.
#11 of 17 Re: Unintended Acceleration [dkshdws]
Jan 21, 2010 (5:39 pm)
The easiest and simplest "fix" would be to use the 12 volts from the brake light circuit to energize a relay.
Then the relay contacts could be used to...
"Drive" the DBW throttle servomotor to idle.
#13 of 17 Re: Unintended Acceleration [steve_]
Jan 22, 2010 (11:36 am)
What do I think..??
Not a surprise.
The time has long since passed for the designers to have begun using firmware to DRIVE the throttle opening servomotor to the idle position with the brake applied.
Or use a torque motor on the gas pedal itself instead of a spring. The torque motor could then be used to provide the driver with vibratory feedback if/when wheelspin/slip is detected.
Many of the new EPS, Electronic Power Stearing, systems now use ("directed" by VSC) differential power stearing "assist" torque to prompt the driver to not turn the stearing wheel in the wrong direction.
#14 of 17 2009 RX 350 engine revs when shifting gears
Feb 05, 2010 (4:39 pm)
I bought a Lexus RX 350 (brand new from Kendall Lexus in Eugene,Oregon) in 10/22/09. I noticed when I got it home that when shifting between gears the engine frequently revs up (1000-2000 rpms then catches the next gear). I talked to the dealer when I had some service work done in November 2009. I was told it's a common problem, a computer chip is faulty and it won't hurt anything. It's still doing it and I'd like to know what to do. Is there a phone number to talk to someone higher up in Lexus?
#15 of 17 Re: 2009 RX 350 engine revs when shifting gears [tuna5]
Feb 06, 2010 (9:07 am)
These new 6(9) speed transaxles will often use the torque converter lockup clutch in the top 2 or 3 gear ratios, not just OD. When you change gears the lockup clutch will get disengaged until the ECU has time to "judge" the engine load factor in the new gear ratio. So, momentarily you will be making use of the torque converter which results in a higher engine RPM than if/when the lockup clutch is subsequently engaged.
But even so, 2000 RPM does seem extreme, 1000-1500, maybe.
You might experiment with turning the OD switch off and on in different gear ratios and engine loadings to get an idea of the engine RPM changes with and without the lockup clutch engaged.
#16 of 17 Why No Lexus Recalls?
Feb 28, 2010 (1:06 am)
Friend of mine took is 07 ES 350 in for an oil change and 4 hours later they gave his car back after reshaping the pedal, removing foam from under the carpet, reprograming his computer, and filling up his gas tank for free. Lexus is dishonest in not recalling the ES and the SUV based on the Highlander. They have the same acceleration problems. I will not buy a Lexus or Toyota product again. NEVER
#17 of 17 Re: Why No Lexus Recalls? [jsdtx]
Mar 05, 2010 (9:48 am)
A recall on a Lexus...
Horror of HORRORS...!!