I was wondering if it could be the maf sensor on my 1990 Volvo 740? Where is it & how do you clean it? Does somebody have a picture of exactly where it's at. The car runs perfect but has no power. It bogs down when you give it a lot of gas. Thanks everyone!!!

 

The MAF is the first thing after the air filter. Its got wires running to it right after the filter.

 

What makes you think it is the MAF sensor? Have you looked at the diagnostic codes to see if anything comes up. A lack of power could be from a few different items. When you push the throttle just sitting in the car does it rev up OK? After you take it for a drive and you push the car try to stop and look under at the catalytic converter and see if it is red hot. This is one of a few different item that could cause poor acceleration. Get the codes first.

 

I checked the cat & it doesn't glow. My check engine light also does not come on. Doesn't the check engine light come on to read codes?

Thanks,
Scott

 

I would always check the diagnostic code device 1st. Just to make sure there are no codes stored. This will tell you if you have a bad sensor reading and where to look. Yes the CEL usually will stay lit if a code sets but just verify to make sure. If there are no codes then it is back to basic auto mechanics 101. It will be either fuel or ignition related. So lets start with checking the codes and go from there.

 

jagtoes, thank you!! I appreciate all your replys very much. Being that it is showing no codes & there could be some stored. Do you know of any automotive places that will check it for free. I thought there were but i'n not sure. Thank you so much again!!

Scott

 

Try this it is a DIY Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical

 

OBD-II that requires a reader module didn't come out until 1996.

A 1990 740 should have its own built in code reader, its a little rectangular thing just in front of the left side wheel hump, behind the ABS controller. has a plastic cover, and a little plug on a short wire. under the cover are 6 holes numbered 1-6, and a button and a LED. key off, plug the wire into #6, turn the ignition on but don't start, and press the button for 2 seconds, release it, and the LED should blink out a series of codes. 1-1-1 is no code. 2-4-1 (thats 2 blinks, pause, 4 blinks, pause, 1 blink) is a typical code. there can be more than 1 code stored (after each group of three, there's a long pause, then the next group). when the first code repeats, you've seen them all. there's also a different set of codes with the plug in #2 (I think). floating around various 740/940 FAQs should be the tables of the codes. one set is fuel, the other set is ignition.

 

#2 is fuel injection, #6 is ignition..