i have a '92 240 with LH3.1. It was showing a MAF code; I measured the resistance on the plug and it was several thousand Ohms. Manual says it should be 108. I bought a new one (insert). It didn't fix the problem. I measured the resistance. It was also way out of spec; several thousand ohms. I bought ANOTHER new one. Same story. So, I have several questions. Am I measuring them correctly? And where is the best place to buy a good one? The sites that I trust to sell good ones are sold out. I can't even remember where I bought these. The car is very hard to start when the engine is cold; but it gets good fuel economy.

 

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See if any of Scotty's videos on MAF will provide more insight?
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https://www.youtube.com/results?sear...mer+maf+sensor
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MAF codes are often thrown when the lamda control can't adjust the fuel trim enough. Cold start issues typically are caused by one of a few things 1) intake air leaks. Cold engine wants a rich mixture and air leaks/vacuum line leaks lean it out 2) low fuel pressure. If your fuel pressure bleeds down over night, it may take 15-30 seconds for the pump to bring up the correct pressure to the injectors 3) cold spark. check plug type/gap/color, wires, rotor/cap. Not an expert on the LH but some earlier FI systems use an idle air valve to control the mix. If you have one, check to see if its clean and working.

A good resource for trouble shooting: Volvotips.com

 

the idle air controller is strictly used to adjust the idle RPM to the nominal 700 rpm (with a fully warmed up engine)