how do you clean you mass air flow sensor,the code was 34 MAS i took it out didnt take it out of the plastic just sprayed both sides are you suppose to sprayup in the electric where you plug the wire

25

Asked by May 29, 2013 at 06:10 AM about the 1984 Buick Grand National

Question type: Maintenance & Repair

how do you clean you mass air flow sensor,the code was 34 MAS i took it out didnt take it out of the plastic just sprayed both sides are you suppose to sprayup in the electric where you plug the wire.i took it to auto zone a couple of weeks ago and he said it was reading code 12.so and since I have had it its always sometimes didn't start like you would be driving and it would start all day then maybe one day you pull in and get gas and when you got back in it it wouldn't start then you would wait 15to20minutes later then it would start it just started acting up like this so I still think it could be a vacuum leak is there supposed to be a pvc valve on my gn 84 iv seen 4 different specs well I cant find on are you suppose to have the pvc valve on the vacuum hose

3 Answers

264,445

Spray MAF cleaner onto the entire MAF, including the screen, the sensor and the plug area. CODE 12 Trouble Code 12 is a special-case code that is not logged into the ECM's Non-Volatile Memory (NVM) when detected. When the ECM detects no ignition reference pulses from the ignition module when the ignition is in the 'ON' position, it illuminates the Check Engine Lamp (CEL), but does not log this code as it would other codes. Code 12 is used on most systems when in the Diagnostic mode (ALDL Terminal B grounded, key-on/engine-off) to signal the beginning or end of a so-called 'diagnostic sequence', when the ECM annunciates each stored code in the ECM's NVM on the dash CEL. When in this mode, the ECM will begin by flashing code 12 on the CEL 3 times. This indicates the beginning of a diagnostic sequence. It will then flash any codes stored in NVM 3 times each before proceeding to the next code. When all stored codes are finished, the ECM will again flash code 12 to indicate the end of the diagnostic sequence. The cycle will continue as long as the ECM is in Diagnostic Mode. So a vacuum leak has nothing to do with your no start hot condition.

264,445

Did you inspect all your ignition components for cracks or loose/corroded connections?

25

I really don't know where all the ignition components are

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