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Hybrid Vehicles Lexus RX 400h Lexus RX 400h Maintenance & Repair Lexus RX 400h Engine Problems
52 messages, Last post on Feb 05, 2009 at 6:59 AM
You are in the Lexus RX 400h Maintenance & Repair Forum. Your Host is pf_flyer
| 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???? | |
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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?
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Replying to: rohey (Jan 12, 2009 10:47 pm) 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. |
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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.
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Replying to: rohey (Jan 13, 2009 7:26 pm) |
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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... 
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| 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. | |
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Replying to: upstatedoc (Feb 04, 2009 9:11 am) |
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