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Lexus RX 400h Engine Problems

52 messages,  Last post on Feb 05, 2009 at 6:59 AM

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What is this discussion about? Lexus RX 400h, Engine, SUV

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#43 of 52 Re: concerned about the"stuttering" [bobgail] by apg97 Jul 02, 2007 (7:01 pm)
Replying to: bobgail (Jun 20, 2006 3:27 pm) Well, it turns out the stuttering or pulsing or oscillating at 40 and then at 60 mph was real, and not my imagination after all. through helpful advice on 'Club Lexus' web site, i found that other people experienced same problem, and some were willing to fight lexus until this was recognized as legit. i must admit i didnt have the time or hard skull to fight as hard.   So, now there is an 'official' technical service bulletin isssued by lexus. EG013-07 Title: "Rocking" Feeling at Highway Speed (Around 70 MPH)   I went back to dealer today armed with this info, and after more convincing to take me seriously (more test drives with the tech who didnt sense anything wrong), they finally read this service bulletin after my insistence.   It took a few hours to install the software patch. i just did a nice long, test drive tonight, and the problem is fixed. so nice to reach 60mph without feeling a powerless, shuttering blob. what a relief after putting up with this for 15,000 miles.   so if there are others out there w this problem, you now have the cure at hand. you just have to bring Lexus a cure to fix their own vehicles, and you will be fine Replies to this message: texamau1 (Aug 10, 2007 6:04 am)
#44 of 52 Re: concerned about the"stuttering" [apg97] by texamau1 Aug 10, 2007 (6:04 am)
Replying to: apg97 (Jul 02, 2007 7:01 pm) hi, what's year/month is your RX400h?? because I do not have that stuttering/pulsing issue. I 've tried all range of speed (5mph-35mph in local road & 40pmph-80mph on hwy)
#45 of 52 Water Temperature Message by erlesnews Jul 13, 2008 (6:55 am)
I recently completed a 4200 mile road trip in two weeks. After driving 800 miles the "water temp" msg came on and the red triangle was flashing. The main water temperature gauge read normal. I pulled into the Little Rock dealership and they spent 3 hrs checking it. Didn't need coolant. Things checked out. Went on my way and preceeded to have the problem again for another 12 times over the course of two weeks. The only common denominator was it only happened on days that were 88-95 degrees and only on the interstate. Once home my dealership tested and could find nothing. Anyone else have this problem????
#46 of 52 Throttle surge / pulsating by rohey Jan 12, 2009 (10:47 pm)
Bought a certified 2007 for the wife a couple of months ago. I rarely drive it but had it out today on the freeway. It's impossible to keep at a steady speed. Even if I keep the gas completely steady the car sort of pulsates down the road as it ever so slightly speeds up and slows down. It's feels like the driver is constantly moving the gas pedal foot and you find yourself bobbing down the road. Is this just a charecteristic of the hybrid engine? I drive a C6 Corvette so the wife thinks I don't like the way it drives in general....but really it's quite irritating. Anyone else had this issue? Replies to this message: wwest (Jan 13, 2009 10:02 am)
#47 of 52 Re: Throttle surge / pulsating [rohey] by wwest Jan 13, 2009 (10:02 am)
Replying to: rohey (Jan 12, 2009 10:47 pm) What about when using cruise control to sustain a steady speed...??   Have you tried that..?? Same symptoms...??   Almost all new cars use DBW, E-throttle, wherein the gas pedal is NOT connected mechanically to the throttle plate. The gas pedal is connected ONLY to the engine/transaxle controlling ECU.   So the car can react to "pertubations" in the roadbed, along with MANY other circumstances, without any movement whatsoever of the gas pedal. For instance if the SOC of the hybrid battery is such that it requires use of the ICE for recharging the ICE RPM can rise to meet the additional HP/torque requirement but due to the CVT roadspeed should not be affected...."should not" being the operative term.
#48 of 52 by rohey Jan 13, 2009 (7:26 pm)
OK went and tested as wwest suggested with the cruise ON....interesting the pulsing goes away? This suggests it's not an engine problem but a computer issue. My original post was moved to this long established thread and it looks like this is a problem reported by others. So the car is headed to the shop Thursday for diagnois and most likely a computer software upgrade. Any other insight and experience with this issue would be appreciated. Replies to this message: wwest (Jan 13, 2009 8:10 pm)
#49 of 52 Re: [rohey] by wwest Jan 13, 2009 (8:10 pm)
Replying to: rohey (Jan 13, 2009 7:26 pm) You're probably going to find out this "pulsing" is the nature of the beast, SOP.
#50 of 52 Explosion by upstatedoc Feb 04, 2009 (9:11 am)
Did anyone catch the story on CNN about the doctors rx400h exploding in his driveway critically injuring him and also injuring 2 others? Just happened today. ATF and FBI do not suspect foul play. I'm sure lexus has a "team" on the way as well. Scary... Replies to this message: upstatedoc (Feb 05, 2009 6:59 am)
#51 of 52 by rohey Feb 04, 2009 (10:47 pm)
pulsing is gone......They the flash program listed in the TSB and all is fine. Never acknowledged it was a known problem and di not want to have anything to do with the copy of the TSB I brought it????? Oh well the wife's rig is a pleasure to drive again.
#52 of 52 Re: Explosion [upstatedoc] by upstatedoc Feb 05, 2009 (6:59 am)
Replying to: upstatedoc (Feb 04, 2009 9:11 am) Looks like it was a bomb...I don't know whats scarier.

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