IS F (2008-2014) Discussion topics related to the IS F model

strange car vibration

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Old 10-17-09, 06:08 AM
  #16  
skk440
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I think i just hold lexus to an impossible standard. Bottom line, cars are cars, imperfect machines. So, i'm going with option two and move on.
On the bright side, I was able to get recommended after market parts for exhaust and intakes.
Old 10-17-09, 09:03 AM
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hahahaf
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mines perfect, haha
minus all the rock chips
Old 10-17-09, 11:00 AM
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AU_EE
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I'd put my $.05 bet on fuel... try a different source or a booster as mentioned previously. Even reputable brands can have small amounts of water leak into their tanks, or some goofball put the wrong grade in the tank.
Old 10-17-09, 11:09 AM
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Audriuss
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it is not the fuel, it is something with firmwire of ECU of in some other place where ECU is involved.

I got same vibration problem last winter, but the winter ended without having the problem solved.

The car used to drop RPM to less the 500 and start shaking. Got it all recorded by dealer service computer, and sent for investigation...but as it was like a long chane for investigation, they asked for more info recorded and specificaly from gearbox, but the temperature rised already and this problem disapeared...

My car did this:
> Outside must be -4 Celsious or colder
> Must be in "D" standing still (with your foot on the brake)
> Just watch how the rews drop lower then 500...
Old 03-09-16, 02:37 PM
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6i9
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Sorry for the thread revival but I noticed today after my car warmed up that if I turned on the interior HVAC fan, the idle rises to about 1000-1200RPM, then lowers once I turn the fan off... Is that normal? There's a slight vibration from the idle rising as the engine is slightly under more load
Old 03-09-16, 03:17 PM
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j3ff
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Originally Posted by 6i9
Sorry for the thread revival but I noticed today after my car warmed up that if I turned on the interior HVAC fan, the idle rises to about 1000-1200RPM, then lowers once I turn the fan off... Is that normal? There's a slight vibration from the idle rising as the engine is slightly under more load
It's your a/c compressor coming on. It's extra load so you see the rpms fluctuate. Completely normal.
Old 03-09-16, 03:20 PM
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Originally Posted by j3ff
It's your a/c compressor coming on. It's extra load so you see the rpms fluctuate. Completely normal.
But my A/C is not turned on, just the interior fan. Is simply turning on the blower motor putting additional load on the alternator to cause the idle to increase to compensate?

I'm wondering if it may be voltage issue due to a fairly old 12v battery
Old 03-09-16, 03:27 PM
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It's probably your exhaust hitting the frame or it you have aftermarket headers, has happened to me before, there's a little brace that holds the headers and exhaust in place it could be lose or the bushings are ripped
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