73-87 Chevy _ GMC Trucks > Fuel Systems and Drivability
So it isnt my fuel pump **TROUBLE CODES ADDED 4/19** *VIDEO ADDED 4/16*
VileZambonie:
You don't need a code reader to pull codes all you need is a paper clip. Jump the A&B terminal in the data link connector and turn the ignition switch on. It should flash codes at you starting with 12. flash pause flash flash is code 12 and so on. Did you check for vacuum leaks at the base of the throttle body? Is the vacuum hose connected to the TBI unit and to the MAP sensor?
87ChevyR10:
--- Quote from: VileZambonie on April 16, 2013, 08:37:36 PM ---You don't need a code reader to pull codes all you need is a paper clip. Jump the A&B terminal in the data link connector and turn the ignition switch on. It should flash codes at you starting with 12. flash pause flash flash is code 12 and so on. Did you check for vacuum leaks at the base of the throttle body? Is the vacuum hose connected to the TBI unit and to the MAP sensor?
--- End quote ---
Ive read bout the paper clip method but im not really one for automotive morse code. on the vacuum leak, havent checked that, and yes, the hose is connected. I doublechecked after replacing the map sensor
87ChevyR10:
Vile - u check the video?
VileZambonie:
Spray some carb clean at the base of the throttle body with it running and see if it changes engine speed.
Fairlane514:
Hook up a vacuum gauge to full manifold vacuum source and see what it tells you.
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