stalls, sluggish & shifting is off

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Tutor: None Selected Time limit: 3 Days

My Lexus LS400 stuttered for a few seconds when pulling into a parking lot.  After a meal the car started fine but didn't respond well when I went to pull out onto the road.  The car was very sluggish, not responding to the gas pedal.  Then it stalled going around a corner when I stepped on the pedal and at a stoplight, too.  It also wouldn't shift well, yet when I shifted manually the car ran well through the first three gears.  This car has been running beautifully and the problem occurred like a switch was flipped.  Can someone tell me what's going on with this car?

Nov 1st, 2013
HI,

This problem may have more causes, but one of the most evident based on your statements above is the Transmition Shifting Solenoid.

Did you spill any drinks on top of the shifter lately, before this problem occurred ?
Nov 1st, 2013

Thanks for your prompt response, V.  No, no spilled drinks.  One thing I forgot to mention, though, is that when in D, the car seemed to run higher RPMs and I don't think the car shifted into overdrive.  I just checked fluids and they look good with no burnt smell.  Does this info help narrow down the possibilities?

Nov 1st, 2013

Hi,

Thanks for the additional info. Now my presumed possibilities have changed. Check the Mass Air Flow sensor. This is the electronic sensor near the Air Filter. This is also the perfect time to have the throttle positioning sensor checked. Pepe boys,  o'reily , and autozone can test these sensors for you for free.

Nov 1st, 2013

Thank you for your kindness. I'll have them checked out today. Wouldn't happen to be in Detroit or know a mechanic here, huh? 

Thanks again -

Drew

Nov 1st, 2013

I'm in California and I don't know any mechanic in Detroit area. But if you know someone who can remove the Mass Air Flow sensor and the throttle positioning sensor, you can have them check at any autozone for free. I am not sure if they autozone will test them while on the car. They stop doing the testing here in California because of some crazy laws they passed some years ago. Check with Autozone if they can do the testing for you without removing the part. Most autozone stores have at least 1 SAE certified technician so we can be sure that they also know what they are talking about. Look for the SAE badge on their sleeve. It is ok to ask if they are SAE certified before allowing them to test your car.  By going to Autozone, you will saving a lot of money and know exactly what is wrong with your car before taking it to the mechanic. Some autozone Store technician if the problem is just a mass air flow sensor, they can replace on the spot. It only take two bolts to take it out.

If Autozone can test it, you can ask them to pull out  error codes from the ECU just to make sure which other parts are faulty. Autozone provide all the testing for FREE and have been pretty helpful to DIY people.

Nov 1st, 2013

Well, V. Is there an alternative plan 'B'? I went to take the car to autozone and couldn't get out of the driveway. The car starts and idles fine, but stalls every time I put it in gear.  Can I take this sensor off to have tested or is it time to have it towed?

Nov 1st, 2013

Pardon my abscense seizure!!!  I just re read your answer and will have it tested.  Thanks again for your help.

Nov 1st, 2013

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May 28th, 2017
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