The '87 Firebird has been having some problems on the freeway with hesitation for a little bit, it finnally threw a code today but I couldn't find any mention of code 34 in relation to TBI engines. The car was originally a 2.8L car but the engine/wiring/computer is from a 91 Camaro with an LO3. Anyone know what I should be checking?

 

Code 34- MAP sensor- Leaking or restricted vacuum hoses; poor electrical connection, open or short in circuit; defective MAP sensor; defective ECM


First thing to check is the vacuum line for the MAP sensor. Check the line for cracks, tears, and that the vacuum line is connected, of course. It comes right out of the back side of the TBI unit and then runs to the underside of the MAP sensor. Also check and make sure that the electrical connector for the MAP sensor is on and tight.