Under WOT the pulsing does not occur during acceleration.
I have cleaned the MAF with CRC MAF cleaner. No change.
I have replaced all vacuum lines. No change. I have used carb cleaer to identify additional leaks with negative results.
There are no DTCs from the engine or transmission
The Lexus dealer tested the vehicle for 6 hours stated "It is probably the transmision for $4200. If that does fix it its probably the TCM for $900."The transmission fluid was dirty and was changed along with a flush.
They say it "probably" it needs a new transmission, yet when in Park and in nuetral, the rpm pulsing occurs btwn 1800 and 3000 rpms. That is if you hold it at 2000 rpms, the rpms occilate about 2,000 rpm. When driving the car surging is very obvious and noticable and potentially dangerous.
It does not stumble or shudder.
The pulsing is smooth and is a decrease in rpms as if smoothly cutting out. The pulsing has progressively become worse within the past few months, over 200 miles.
The vehicle has 41,000 miles.
Again the rpms do pulsate between 1800 and 3000 rpms when the vehicle is in park and and in neutral, which makes me suspect fuel delivery or pressure issues.
the vehicle shifts w/o a problem. The transmission is fully engaged engaged when the pulsing accelerations occurred. It is not evident when driving at fixed speeds.
You assistance is greatly appreciated.
Tuesday, January 17th, 2012 AT 3:37 PM