I am getting these codes, now, most of you have probably seen my code 12 post, just for get about it, I am now geeting these code and need to know how to fix them, i know they come up b/ci have seen them on this board before


34. Low voltage (high vacuum) at mass air flow sensor (or MAP sensor)

36. Burn off at mass air flow sensor OR
Problem in transmission shift OR
Fault in direct ignition system OR
Missing pulses in electronic spark timing signal

 

6-speed,

Since you have been getting a DTC36 for a while, the 34 is expected. Even without having a failed MAF sensor, the lack of MAF burnoff will cause the sensor's hot wire to become coated with dirt, film, oil, and dust. This is the same brown junk that coats the inside of the plenum and throttle body, even though the incoming air is "filtered".

The coating on the hot wire will insulate the sensor, causing it to lose less heat to the surrounding air. The loss of heat to surrounding air is how the sensor measures incoming aor mass. This coating will affect the reading that the MAF reports to the ECM. The signal can become so low that the ECM calculates that the signal is too low for the given engine RPM and given throttle position. This will set a DTC34.

You may not have a failed MAF, just a dirty one. This is why the MAF undergoes a burn-off cycle in the first place - to clean the hot wire. Repair or replace the burn-off relay, and try again. The MAF might still be O.K.

------------------
Later,
Vader
------------------
Justice and Freedom will Prevail

 

ok, i put in a new relay and reset the computer. As of now the code 36 returned, in the code book it also says it could be a EST problem, maybe that is what the 2 prong connector at the rear on the engine should be connected too?!!, well, i am getting better reading from teh MAF anyway b/c there is a DRASTIC difference emissions(you can't smell it 20 feet away anymore, you have to get right up into the rear)

------------------
1987 Black 305 TPI 5spd IROC, seems to be fully loaded, but can't find RPO codes.

AIM: SzkiRM125
F-bodies : The last with-standing defense against the Invasion.

 

6 Spd,

Check and clean the electrical plug at the MAF sensor. Make sure it is fully seated in the connector.

Another less common reason for a DTC 36 is an intermittent auxilliary oil pressure switch. The switch is supposed to provide and alternate path for power to the fuel pump in the event of failure of the fuel pump relay. This signal is also the "trigger" for the burnoff sequence for the MAF. If the pressure switch opens, then closes again as the MAF burnoff cycle has initiated, the DTC 36 can be set since the pump power signal at the ECM will interrupt the cycle. That's a rare, remote possibility, though.

------------------
Later,
Vader
------------------
Justice and Freedom will Prevail

 

my oil pressure gauge is jumpy and i am not geeting accurate readings from it.

 

I am thinking I will just give it to a shop to get rid of the code.