I have cleaned the MAF with CRC MAF cleaner, no change.
I have replaced all vacuum lines, no change. I have used carburetor cleaner to identify additional leaks with negative results.
There are no DTC's from the engine or transmission
The Lexus dealer tested the vehicle for six hours stated "it is probably the transmission for $4,200.00. If that does fix it its probably the TCM for $900.00". 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 neutral, the rpm pulsing occurs between 1,800 and 3,000 rpm's. That is if you hold it at 2,000 rpm's, the rpm's oscillate about 2,000 rpm. When driving the car surging is very obvious and noticeable 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 rpm's do pulsate between 1,800 and 3,000 rpm's when the vehicle is in park and and in neutral, which makes me suspect fuel delivery or pressure issues.
the vehicle shifts without 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.
have the same problem?
Tuesday, January 17th, 2012 AT 3:37 PM