my 93 ls400 has this weird thing it does. when i'm driving, it's fine, but usually after a long drive, when i go to park the car and shift it into park, the car shudders a bit, the rpm drops a small notch, and then it goes back to normal. does anyone else experince this? thanks.

 

anyone?

 

for how long does it do this RPM drop? like a second? or a few minutes? and how many miles does have on it btw?

 

shudders for about 1-2 seconds. the car is about 180k miles.

 

yoohoo???

 

Dont have a clue.. lol

 

Sorry, I wrote the post this afternoon, and forgot to press submit.

Well, the air valve (I forgot the technical name for it) adjusts engine speed according to load, and it might need some cleaning. It tells the engine at which speed it should run, so if you turn on the A/C, it adds more RPM to compensate, same if you turn the wheel while parked, you will notice the RPM drop, and the Air valve will adjust accordingly, and the RPM will go back up.

Nothing major, i've seen this happen to my car but slightly, maybe your air value (GOD, I CANT REMEMBER THE NAME OF THIS PART TODAY!!!!) needs a bit of cleaning.

IVAC? Is that it?

 

GRAND_LS 4 thanks for all your replies. I really appreciate it.

Would you happen to know what it looks like? Can you post a pic? Thanks bro!