Chevy Silverado
Pontiac Grand Prix
Ford F-150

Where is the modulator valve for the 4 speed automatic transmission on a 1998 Pontiac Gran Prix?


Top Answer
User Avatar
Wiki User
2015-07-17 17:40:51
2015-07-17 17:40:51

I'm not sure on the 1998 but on my 1996, the modulator valve was difficult for me to find as well. What I eventually figured out was that it is under the hood and can be seen after you remove the air filter box. It sits on the very front of the housing that bolts to the back of the motor pretty much under the air filter box. The valve is round and has a vacuum line running to the intake manifold so you should also be able to follow that vacuum line. The vacuum line attaches to the intake somewhere around the middle and on the front side of the engine or the left bank of cylinders. I , but if not, please email me directly at and maybe we can figure it out together.



you don't have a modulator the tranny is fully electic no vucuum control



Related Questions

User Avatar

standard (shift gear) 5 speed Automatic 4 speed

User Avatar

The base transmission was a 3-speed manual. The 4-speed manual and 3-speed automatic were optional. Both manual transmissions were Muncies and the automatic was the turbo 400.

User Avatar

Answer6 speed manualor4 speed automatic what type or name for the 4 speed aout.?

User Avatar

you answered it yourself, a 4 speed with overdrive

Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.