Hey guys. Wondering if you could help me check my maf sensor with my volt meter. Wondering if this surging is because of it.

 

You can only check it's output with a voltmeter than can measure the frequency of the signal output. The 94 service manual does not state the frequency limits that I can find. But the 98 one implies it goes from about 1200-1500HZ at idle to about 9000-10000HZ at max air flow.

 

This is the calibration table I pulled out of my stock 94 PCM program:

FREQ - GPS
0 - 0.00
1,488 - 2.45
1,616 - 2.88
1,744 - 3.34
2,640 - 8.41
3,024 - 11.60
3,664 - 18.60
4,432 - 30.97
5,968 - 69.92
7,504 - 136.88
9,040 - 239.52
10,576 - 391.88
11,216 - 471.51

You will typically see 6-10 GPS at stock idle (800 rpm in the M6 - probably a bit less with the lower idle speed of the A4. So look for something closer to 2,000-2,500 Hz. At WOT the stock engine seems to max out the MAF sensor at about 240-260 GPS. So look for 9,000-9,300 Hz. At least from what I remember of collecting this data 15 years ago.

 

You guys are good I wonder if there is a question you don't have the answer to. Looks like the maf is good along with the map that I asked about in another thread. Quick question do I need to keep posting new threads to check these sensors or can I ask them all in one thread. Like now I want to check my O2 sensors then coolant sensors and so on. Thanks guys.

 

Get a scanner so you can look at readings. Much simpler. Everyone needs a scanner, anyway. O2 readings change too fast to look at them with a meter. There is a table for temp sensor readings on my website.