Lexus IS250 4GR-FSE Engine Carbon Build-up (merged threads)
05-18-10, 04:42 AM
#106
05-18-10, 08:37 AM
#107
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I had this whole process done 4 months ago (the Regional Service Rep happened to be at the Dealer when I brought it in and witnessed it). Sad to say, the vibration has been slowly coming back (was never totally gone). My vibration only goes away in "D" at idle if the idle kicks up due to A/C compressor running, lights on or rear defrost on. Very frustrating. . . .
05-18-10, 01:44 PM
#109
My vibration is 50-75 percent LESS now.
After the water injection cleaning I didn't drive it the next day because I was raising the car up. I'm not sure if there were still debris from the carbon that was still in the car and gone now because i drove it more or because I raised the car up. I'm AWD but i put is250 spring on to raise it up so i can bring it in for 3 recalls that I recently got. I did read somewhere that lowering AWD will cause vibration. I also did noticed that my front axles were pushed out a little. The inner boot was not in the right place. I'm on is250 springs now and wonder if I went with my stock AWD spring will it decrease the vibration any more?
So i'm wondering for those who do have the vibration with NO check engine light, are you lowered or stock?
After the water injection cleaning I didn't drive it the next day because I was raising the car up. I'm not sure if there were still debris from the carbon that was still in the car and gone now because i drove it more or because I raised the car up. I'm AWD but i put is250 spring on to raise it up so i can bring it in for 3 recalls that I recently got. I did read somewhere that lowering AWD will cause vibration. I also did noticed that my front axles were pushed out a little. The inner boot was not in the right place. I'm on is250 springs now and wonder if I went with my stock AWD spring will it decrease the vibration any more?
So i'm wondering for those who do have the vibration with NO check engine light, are you lowered or stock?
05-18-10, 04:17 PM
#110
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i just brought my car to a dealer this morning. my car has 58,000 miles (i don't have the extended warranty). my service advisor told me that i do not have to pay for top engine cleaning thing since it is still under 70000 miles powertrain warranty. i am gonna pick up my car tomorrow. hopefully my car would have less vibration.
05-18-10, 05:34 PM
#111
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My vibration is 50-75 percent LESS now.
After the water injection cleaning I didn't drive it the next day because I was raising the car up. I'm not sure if there were still debris from the carbon that was still in the car and gone now because i drove it more or because I raised the car up. I'm AWD but i put is250 spring on to raise it up so i can bring it in for 3 recalls that I recently got. I did read somewhere that lowering AWD will cause vibration. I also did noticed that my front axles were pushed out a little. The inner boot was not in the right place. I'm on is250 springs now and wonder if I went with my stock AWD spring will it decrease the vibration any more?
So i'm wondering for those who do have the vibration with NO check engine light, are you lowered or stock?
After the water injection cleaning I didn't drive it the next day because I was raising the car up. I'm not sure if there were still debris from the carbon that was still in the car and gone now because i drove it more or because I raised the car up. I'm AWD but i put is250 spring on to raise it up so i can bring it in for 3 recalls that I recently got. I did read somewhere that lowering AWD will cause vibration. I also did noticed that my front axles were pushed out a little. The inner boot was not in the right place. I'm on is250 springs now and wonder if I went with my stock AWD spring will it decrease the vibration any more?
So i'm wondering for those who do have the vibration with NO check engine light, are you lowered or stock?
05-23-10, 11:02 AM
#114
You hit the nail right on the head. Really what it comes down to is a poor PCV system. It's an inherent engineering design flaw where nothing can be done to improve it short of adding an external oil catch can, which is something I (and another 3GS member) am looking into doing.
05-23-10, 05:15 PM
#115
You hit the nail right on the head. Really what it comes down to is a poor PCV system. It's an inherent engineering design flaw where nothing can be done to improve it short of adding an external oil catch can, which is something I (and another 3GS member) am looking into doing.
The TSIB is specifically for the 250, which is DI only... everything I've read said no issue on the 350 due to having both PI and DI.
05-24-10, 02:37 PM
#116
Well, although the GS350 (2GR-FSE) has DI and PI, we still suffer from carbon build-up. The motor designs are essentially the same, thus they both have the same PCV system. While it has the PI to help keep the valves clean, they don't keep them clean enough. There are plenty of GS350 owners that have this problem as well even though the TSIB out for the 3GS only pertains to the GS300.
05-24-10, 03:02 PM
#117
Well, although the GS350 (2GR-FSE) has DI and PI, we still suffer from carbon build-up. The motor designs are essentially the same, thus they both have the same PCV system. While it has the PI to help keep the valves clean, they don't keep them clean enough. There are plenty of GS350 owners that have this problem as well even though the TSIB out for the 3GS only pertains to the GS300.
Do you have photo evidence? Engines with PFI have used internal & exhaust gas recirculation to reduce emissions just as cars DI have. It is not a feature unique to a DI engine, yet it is not a problem PFI engines seem to have.
05-24-10, 03:07 PM
#118
No photo evidence but saw my own in my own intake valves with my very own eyes on my 350. Surf the 3GS forums and you'll see 350 owner's complain about symptoms. Perhaps not as wide-spread as the 300 (likely due to the PI) but it exists.
EGR can only help so much if the PCV system was designed poorly. All that gunk and blow-by in the crankcase makes its way back into the intake track. Using a catch can can soak up the oil and only allow air back into the motor.
EGR can only help so much if the PCV system was designed poorly. All that gunk and blow-by in the crankcase makes its way back into the intake track. Using a catch can can soak up the oil and only allow air back into the motor.
05-24-10, 08:20 PM
#119
No photo evidence but saw my own in my own intake valves with my very own eyes on my 350. Surf the 3GS forums and you'll see 350 owner's complain about symptoms. Perhaps not as wide-spread as the 300 (likely due to the PI) but it exists.
EGR can only help so much if the PCV system was designed poorly. All that gunk and blow-by in the crankcase makes its way back into the intake track. Using a catch can can soak up the oil and only allow air back into the motor.
EGR can only help so much if the PCV system was designed poorly. All that gunk and blow-by in the crankcase makes its way back into the intake track. Using a catch can can soak up the oil and only allow air back into the motor.
Then why does it seem to be exclusively 250 owners with this issue on the IS?
The IS350 has the same motor as the GS350 far as I know so we ought see widespread reports of it here if you're saying it's widespread on the GS350.
05-24-10, 09:25 PM
#120
Not sure why but that's an interesting question. I don't frequent the 2IS board much but I'd be curious to know if the issue is in the GS350 more than the IS350. From what I'm reading, carbon isn't an issue with the IS350? Or are we just playing percentages here? The IS250 is a better selling model perhaps thus diluting the data? I don't know, really.
But, I did not say that the problem is widespread on the GS350. I said you'll see complaints and that it's NOT as widespread when compared to the GS300. I know for a fact as I've seen it with my own eyes that I've got quite a bit of carbon build-up on my intake valves on both banks of my motor. I'm not having any symptoms or issues anymore. My idling issue was something else (plugs).
But, I did not say that the problem is widespread on the GS350. I said you'll see complaints and that it's NOT as widespread when compared to the GS300. I know for a fact as I've seen it with my own eyes that I've got quite a bit of carbon build-up on my intake valves on both banks of my motor. I'm not having any symptoms or issues anymore. My idling issue was something else (plugs).