I've got a 90 model B2600i with about 250k miles on it. The old truck runs pretty good, but it idles at about 500 rpm's. I have no idea how to adjust the idle. I'd appreciate any help!
thanks,
Tony P

 

You may simply just need to clean your throttle body with some carb cleaner...Chances are there is probably some gunk built up on teh throttle plate and in the air bypass valve..Check and make sure your PCV valve and the plumbing for it are not clogged as well... Otherwise there is a screw on the throttle body near where the big hose from the air filter box connects on the side where the throttle cable connects...