I recently purchased a 2007 IS350 with 55k miles. From what I've read the car should still be under the 6yr/60k powertrain warranty. When driving the car, i've been noticing hard shifting primary on gears 1-3 and especially when rolling to a stop sign and accelerating from a slow corner.

I am planning on bringing the car into the dealership to have the transmission checked. Before I do, should I remove the mods that was installed by the previous owner just in case they blame it on the after market parts? The car comes with F-sport exhaust and after market intake.

 

Your only mods are exhaust/intake?

The only way the dealer will void any type of warranty is if the modified part caused that part or other related parts to have issues.

If you have an aftermarket exhaust and your nav screen dies, they cant blame that. But if your cats fail or you get a bad 02 sensor, thats sometihng that could be potentially blamed on the exhaust

 

^^ He is right. They cannot void your warranty on something just by having aftermarket parts present on the car - unless the aftermarket part caused the failure. The exhaust and intake mods would not cause a failure in the transmission. For something like a transmission to be voided/not repaired under warranty due to mods, you'd have to have something like a turbo or supercharger present that would be capable of causing damage to the transmission.

There's a law that applies to these kinda situations:
http://en.wikipedia.org/wiki/Magnuso...s_Warranty_Act
http://blog.blackdogspeedshop.com/20...your-warranty/

 

I have other minor mods that would not be applicable in this situation such as lights, and alarm. Only intake and exhaust mods to the engine.

Is this a common issue with the isx50?. I tried googling the issue and only found 1 other with similar issue.

 

The common issue with 250s is carbon buildup causing rough ide, but it sounds like your having tranny problems

 

I have a question are you driving your car with the power button on. Because if you are those are the symtoms you will feel.

 

Power button is off. I've also reset the ecu, but did not notice any improvement.

 

Not to mention it's FSport exhaust....Lexus Certified!!!!

 

have you reset your ecu since you got it, maybe the previous owner drove it aggressively, i say reset it and drive it for couple of thousand miles and see if it fix ur problem

 

Good luck with your visit to the dealer. Hope all goes well.

 

u just turned a light bulb on in my head. thanks!!

 

I've reset the ecu by disconnecting the battery from the car for about 5 minutes before putting it back. Is this the correct way of resetting the ecu?

I've only driven the car the for maybe 400 miles after the ecu reset. Does it really take a few thousand miles for the car the learn my driving habit?

 

I think it all depends on the dealer and the type of mods you have on the car. If you established a good relationship with the dealer, they may not be picky about mods. My dealer wasn't picky at all.

 

you will be fine since they are F sport parts..