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Rough idle - MAF sensor?

tobin

Member
Hi everyone. I'm trying to diagnose/fix a rough idle and dismal fuel economy (about 15mpg or 15L/100km) on my 1996 Renault 19 1.8L 8V. Previously replaced a cold air intake hose which was broken for some time (undiscovered). In trying to diagnose the problem, I tried checking what I believe to be the MAF sensor (pictured) by testing the electrical resistance.

lh3.googleusercontent.com__8nJlc4yz5PA_T6PkkYZaAoI_AAAAAAAABuY144813efc319a1f8670e3f87a8fbab85.webp

1. Is the item pictured the MAF sensor?
2. Is it normally dirty/oily? If not, can I clean it with something like ethanol?
3. The resistance across the pins measured approx 2.4 kOhms. Is this normal?

Thanks so much for any help.
 
Nah, that's your intake air temp sensor, when oily/dirty it gives a false reading, clean it with electronic cleaner.
As for your rough idle/poor fuel economy, you likely have a vacuum leak, listen for a sucking/hissing sound around the engine. Or you can spray a flammable substance such as carburetor cleaner around suspect areas to see if it smoothes out.

But be very mindful that you could start a fire while using spray cleaners:!::!::!:

Perhaps others will chime in and give you more specifics on the MAF, as i am not familiar with European specs.
Hope this helps, and good luck!
 
the R19 doesn't have a MAF, but a MAP sensor.. it sits on the firewall next to the ignition module and has a pipe/hose to the manifold.. If it could be the cause of your problem, I'm not sure..
 
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