99' Fuel Pressure Question

Your throttle sticking is caused by carbon build up at the air horn. Pull the big hose of the front of the intake and there is a throttle plate. Use some carb cleaner and get all that carbon off. Another thing that works is to jack up the idle by about a 100 rpm. The adjustment is an allen screw. Its a real little thing that points upward. Its under the part where the throttle cable is attached.

Thanks, I'll check both of those out. I guess the other reason I'm asking this question about the fuel pressure is to see if i need to have the pump replaced since it's still under stop warranty. (for low pressure)

Adair

The throttlebody for that year had problems. I think GM had a secret warranty on the problem. You might want to call a dealer and find out. If I remember the throttle shaft hole would elongate causing it to stick. Do a google search.

I found some info via google, thanks! how do you go about handeling TSB stuff with a dealer?

Adair

You sure it would apply to the Suburban of that year? You have the

right, thats what i thought.. I'll be doing the work myself anyway.. I don't have a suburban. I have a Siverado truck with the 5.3

Adair

GM replaced my throttle body on my 99 that I bought new. I now have 58000 miles on it now and noticed a slight sticking again. This time it was carbon build up, easy fix.

My 99 has had problems with the fuel pump scaling up this is in part due to design. If the tank is running at the last quarter tank or less the pumps run hot. This causes pump failure and at a point less than 50 psi. the injectors won't open this can cause a no start or the truck to stall. The worst part of this is that the pump and sender assy. was not cheap! The recommendation is never let it go past 1/2 tank. when gas is at 94.9 cents per litre this seems impossible! Eric

I try very hard not to let mine get below 1/4 tank.. i think i might have got a bad pump.. the warmer it is outside the worse my problems seem as far as the motor hesitating and acting like it's not getting fuel.

Adair