Guest Jack91 Posted November 7, 2006 Share Posted November 7, 2006 Got the SES light.Diagnostics said E034--MAF sensor.Checked voltages to the sensor with voltmeter per manual but no way to test the sensor.Does anyone know of a way to test the sensor itself? <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted November 7, 2006 Share Posted November 7, 2006 Hrm, don't know on this one. Basics for the MAF would be to clean the wires with rubbing alcohol with a cotton swap Link to comment Share on other sites More sharing options...
Machiner 55 Posted November 7, 2006 Share Posted November 7, 2006 I've had two of the things fail in the last two years (two different cars) Both failures were accompanied by a situation described as follows:While accelerating or cruising, the RPM's are what you would expect them to be at the given throttle positions but when you back off the accelerator pedal, as when coasting down a slight grade, you will notice a cyclic drop and rise in the RPM's every few seconds or so. You don't even need to look at the tach. If you pay attention to the head mounted on your shoulders you will notice a slight nodding movement. So...If your SES light is on and you're setting E034 and you're nodding while coasting... change out the Sensor. You could try to clean it as per F-14 and it may work just fine. Be advised that the two wires string between the four posts on the sensor very fine. I've found that a microscope comes in handy for the job.Price used at a "U pull it" about $10.00Price at local Autozone is about $80.00 - $90.00. Link to comment Share on other sites More sharing options...
2seater Posted November 8, 2006 Share Posted November 8, 2006 It could be tested with a frequency meter. Some better voltmeters have a frequency setting. Actually the diagnostics will read the air flow the ECM is seeing. The other common way to test it is tap on the black plastic cover with the engine idling with something like a screwdriver handle. If the engine stumbles, the MAF is bad. Cleaning the wires is a good first step also. Most other heated wire type MAF's have a "burn off" cycle that occurs when the engine is shut down. A higher than normal voltage is applied to remove contaminants. Our MAF does not use this feature and they can get "stuff" on the wires. Link to comment Share on other sites More sharing options...
Guest Jack91 Posted November 16, 2006 Share Posted November 16, 2006 Just an update ON the MAF problem.I had the SES light But the reading on the diagnosics were not way off.The symtoms were very poor idle,chuggling and rough shifting. Got a used MAF from Jim Finn,installed it. Light is out and car is running well.I believe this will take care of a little chuggle I get in OD with light pedal.I've driven about sixty miles and it has not occured.Thanks to those who offered comments.--Jack Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted November 16, 2006 Share Posted November 16, 2006 I believe a cotton swap with rubbing alcohol is safe and effective to clean those MAF wires Link to comment Share on other sites More sharing options...
Guest Jack91 Posted November 24, 2006 Share Posted November 24, 2006 Well sorry to say it did not cure the OD chuggle.It did take care of eveything else.As far as the chuggle,I have replaced most of secondary ignition(plugs,wires,coil} O2 sensor, MAF etc.I have been reading this column and have the shop manual.Has anyone resolved this issue on their own Buick? Thank you --Jack Link to comment Share on other sites More sharing options...
88blue90black Posted November 25, 2006 Share Posted November 25, 2006 though some engines run rough, I would suggest looking at the injector pulse width, or the resistance from the injector. 13-16 ohms is with in operating norms. I woild hope that would be a last resort. Injectors can be quite expencive Link to comment Share on other sites More sharing options...
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