I have a code 34 but can't find map sensor

GREGORY CLUM

MEMBER
1985 CHEVROLET CORVETTE
86,000 MILES

My 85 vette just died & will not start. The computer is giving a code 34 for a map sensor but I cant seem to find one on the car Noticed the car making a popping sound through the exhaust sounded like a timing issue. Then it smoothed out & ran fine? The next day took it for a drive took off from a stoplight & it just fell on its nose had to keep pumping the gas pedal just to try to keep it running. No power at all. Now it just wont start at all? The computer is throwing a code 34 for a map sensor but I cant find one on the car anywhere? I am getting gas & fire. Could it possibly be the maf sensor? & Would the maf sensor make it not start? Thanks for your time & Have a great day!

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

The MAF should be in the air induction tube between the air filter box and the intake. Yes, it can cause this. Also, if that doesn't fix it, check fuel pump pressure. Make sure it is within spec.

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Sunday, November 13th, 2011 AT 6:49 AM

RASMATAZ

MECHANIC
75,992 POSTS

Manifold Absolute Temp. SensorOn right rear of engine.
Mass Airflow SensorAt front of engine, ahead of throttle body

Do below and check what's missing.

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing