Functionality of MAF sensor
 

How can i know if my MAF sensor is functioning properly? when i unplug it the idle goes crazy jumping all over the place, but that is not a sufficient indication that it is working correctly, or is it?

Thanks,

No it is not.

Thanks, what would be a proper test?

Here is a document on testing MAF's.

That is a cool document but I am not sure how I would use it as a test procedure. To the OP: why do you want to test it?

Does your car have a hot wire MAF, or just an airflow meter with a flapper plate?

-Jason

Slow response, slight idle irregularity, gas milage not great, you have to hit the gas hard to get it going ...

wires, head-gasket, O2, cam position sensor, sparks are all new, ...not much more tuning to do on this engine? or am i missing something....

My engine has the HFM system, with the Bosch MAP sensor similar to No. 2 in the document, but with a round plug...

Here is a thread that might help. I searched on "300E MAF", lots of hits.

http://www.peachparts.com/shopforum/tech-help/222222-1993-300e-2-8-runs-rough-i-wish-hail-storm-would-destroy.html

You might build or buy a code reader for that and see if there are codes.

Yes code reader is the place to start, in addition to code reader you need live data which will give lot of info on how your car is running. I have been using free HFM scanner
(http://www.peachparts.com/shopforum/showthread.php?t=236925) for my M111 and it has been handy software to have.

HFM ECU's are not very sensitive, you usually won't see a error code's for rough idle, minor air leaks etc.

300E does not have a MAF sensor.

This is a 300e 2.8 with the HFM engine management system..why do you say there in no MAP sensor?

Thanks