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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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#14 of 52 Re: Stuttering/Missing [lexus400] by lxpatel Jul 08, 2006 (8:53 pm)
Replying to: lexus400 (Jun 21, 2006 9:51 pm) I haven't had any problems with it either, 8k miles and 8 mos in service. Great gas mileage on highway, got 27 on trip from LA to San Diego and back, 80+ all the way.
#15 of 52 Just want to know by jordanf Jul 16, 2006 (7:35 pm)
Could someone tell me the difference between an interference and non-interference engine Replies to this message: pf_flyer (Jul 17, 2006 8:49 am)
#16 of 52 400 H nibble by lexus400 Jul 17, 2006 (5:49 am)
Well, the car still nibbles with 10,000 miles. They said the computer fix would be here July 4th week, it is the 17th and now they are saying it takes 30 days to get it from Japan-but I will be one of the first to get it.   My father drove the car after taking up to the airport, and he said that he thought that he was going to get sick from the rocking/pulsing that was going on around 40 mph.   I have called an arbitrator to start process and if they don't have a soulution very soon, I guess that is the next step. I should have given them the car back the first time because it was within the 30 day, but I believed them when they told me they were working on a fix. I thought that it would not be the right thing to do to give them the car back and demand my money back although at that point I had the legal right to do that. I thought that I was standing by my word to buy the car and that they would stand by their word to deliver a car worthy of the $55,000 price tag and Lexus name. Guess they are trying to prove me wrong and a fool! Replies to this message: katzjamr (Jul 22, 2006 3:34 pm)
#17 of 52 Re: Just want to know [jordanf] by pf_flyer HOST Jul 17, 2006 (8:49 am)
Replying to: jordanf (Jul 16, 2006 7:35 pm) In an interference engine, the valves open far enough into the cylinders that they "interfere" with the piston's space. The interference design actually improves the efficiency of the engine due to the wider opening valves, but if you run into a problem and the timing is off, the valves can actually strike the pistons, which is NOT a good thing at all.
#18 of 52 Computer replaced and My "Nibbles" are GONE! by dcaenen Jul 21, 2006 (1:41 pm)
Had my Hybrid computer replaced with the new one yesterday, and the Nibbles are completely gone. If this bothers you too, I highly recommend you check it out. I guess there is no Service Bulletin.... my dealer didn't know about it, but the Toyota "Field Mechanical Specialist" did... Took 2 Days to get the new computer though... It was worth it.   Cheers. Replies to this message: wth18359 (Jul 27, 2006 7:22 am)
#19 of 52 1998 Dodge ram 1500- 5.2 liter by swift725 Jul 21, 2006 (3:42 pm)
I love this truck but now when i start it in the morning even if its warm outside or cold, it runs real rough the first 5 minuets or so and hesitates. Replaced coil, plugs, rotor, throttle positioning valve, idle air sensor, and had injectors sent out and cleaned with new seals and screens. ALSO when truck is parked after runing to work or the store, i get back in it in about an hour and its hard starting. But if it sits all night it will start great just run rough for a bit. Or if I start it after its been hot or ran it before 45 minuets to an hour it will not be hard starting.... Please Help?? THX
#20 of 52 Re: 400 H nibble [lexus400] by katzjamr Jul 22, 2006 (3:34 pm)
Replying to: lexus400 (Jul 17, 2006 5:49 am) as you can tell not all lexus dealers are created equal. the majority of us do not have this hesitation problem however i would be upset and not as patient as you if it was me. I do not understand why your dealer has not had the field office check your car, and replace the computer chip. Is there another more responsive dealer nearby you can go to? I would also document this in writing and make sure lexus corporate knows how you are being treated.
#21 of 52 Re: Computer replaced and My "Nibbles" are GONE! [dcaenen] by wth18359 Jul 27, 2006 (7:22 am)
Replying to: dcaenen (Jul 21, 2006 1:41 pm) dcaenen, where did you have the computer replaced? I have the same issue, and am going round and round with Lexus Customer Assistance after the dealer didn't have a fix. They are telling me they have not heard of the problem, and that it is "normal". From this and other forums, it's clear that there is a problem, and it can be resolved either by replacing the computer or performing the ECU update. At this point, I'm really disappointed in the response from Lexus. I came from an Acura MDX, which was a great vehicle. I wanted to try Lexus and the hybrid technology, but this may be my first and last Lexus if they can't admit to and resolve this issue.
#22 of 52 question about engine on startup by chops57 Oct 27, 2005 (11:09 am)
Hello, I just got my 400h last weekend. When I test drove it, the engine was as still and quiet as could be at startup when still in the "park" position. Now that I have it in my garage, I am noticing different behavior. When I turn the key position, it is completely still at first for about 3 seconds. After that, I will still be in the 'park" position, but it will feel like the engine has come to life and I actually feel it running, like I would feel the engine of a non hybrid car. Is this normal? Replies to this message: katzjamr (Oct 27, 2005 11:16 am)
#23 of 52 yes by katzjamr Oct 27, 2005 (11:16 am)
Replying to: chops57 (Oct 27, 2005 11:09 am) This is completely normal. The 400h will start up during a cold start to circulate oil, to get the catalytic converter up to temp, to provide heat on cold days or to charge the battery when it is low. This can happen at any time, but it will always fire up when on a cold start. It feels like the engine in a non hybrid car because that is exactly what is running. It is alittle louder on first start up then quieter when warm. Enjoy your 4ooh.

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