When in Park or neutral, the oil pressure is between 40 and 80. When I put it in OD, D, etc, it drops almost to zero! As long as I am in motion, it is fine. If I come to a stop lite, I can watch it drop as I slow, all the way down almost to zero. It is a 2.8, 1987, 4x4, Auto. When I gain speed, it never goes higher than say, 60(between 40-80), so thats cool, but when I slow down under 15 mph it happens, so at stops I drop er into N, and its fine, it goes back up. Thats all folks!!

Sounds like your engine is getting tired, try a thicker oil

Scooby Dooby Doo !!!

I have the same problem with my 87 tahoe... I also want to know what the hell it is????????????????????????

<font face="Comic Sans MS">The electric oil pressure senders in these trucks are horribly inaccurate (actually holds true for most electronic pressure senders. Example:
my 85 reads about 10 at slow idle and pegs when the engine is over 1500-2000 rpms. Bottom line? Bad sender. As long as it registers some pressure at all I wouldn't be worried about it.

If you want a real accurate reading of oil pressure, get yourself a good quality mechanical guage. </font>

Tim "Sandman"

ORC Land Use columnist:
My November article on ORC

I have the same problem in mine. It only happens when my engine is up to temp. When my engine goes down to an idle my pressure drops to ZERO! I sit at stop lights with my foot on the gas. [img]/wwwthreads_images/icons/smile.gif[/img] I have an '86 2.8 that has just under 30K.

Ben [img]/wwwthreads_images/icons/smile.gif[/img]

Every motor I've ever had have dropped close to zero at idle when hot, especially after some time on the freeway. A big help is an oil cooler. It doesn't hurt to run a good free flowing filter too, I run AC Ultra-gaurd.

If anyone finds a cure, if there is one, I'd like to hear it too!

Chevota