General: 70: air mass flow sensor

[jack taylor]

Hi, I have a 1998 V70,2.5, 20v petrol. Engine management light appeared so read the codes which pointed to the air flow sensor so my mechanic sourced one but the light appeared again. My mechanic thinks that a Bosch part is the answer. These are about £130.00 on ebay whereas the one fitted was £35.00.
Has anyone had problems with fitting a generic meter.thanks

[Baffler]

Originally Posted by jack taylor

Has anyone had problems with fitting a generic meter.thanks

Yes, especially so on turbocharged cars, you can read about all kinds of issues such as radiator cooling fans staying on after switching the ignition off and some send incorrect data back to the ECU which can cause over/under fueling.

Do you still have the original MAF sensor? Ask your mechanic if he tried cleaning it with specific MAF cleaner? This can work sometimes. If not I guess you'll need to bite the bullet and buy a new Bosch meter or try source a known good second-hand meter.

Did you notice any other issues with the car prior to the EML coming on?

[jack taylor]

Hi Baffler, Thanks for that. My car is not turbo. I think the mechanic threw out the old one. Prior to changing the Maff the tickover was erratic and running a little rich. After the new one was fitted everything was fine for a couple of hundred miles and then the EML came back on. Tickover was again erratic and it felt like more choke was being introduced to a hot engine.Also the car is now back firing at low revs. I would welcome your opinion please.

[Baffler]

I'd get back on to him to see if he still has it...it may actually be fine. Next on my list would be to check the ETC sensor for resistance. This is a very simple test with a multimeter. I posted the values in another thread recently...I'll have a search when I get home later.

[Baffler]

Here you go...at 20°C it should be ~ 2800 Ω and at 90°C ~ 206 Ω.

[jack taylor]

Hi Baffler, thanks very much for your time and trouble. I have managed to get the original MAF from the mechanics so shall get some MAF cleaner and give it a go. Failing that it looks like £130.00 for a Bosch sensor. Thanks again jack.

[Baffler]

Originally Posted by jack taylor

Hi Baffler, thanks very much for your time and trouble. I have managed to get the original MAF from the mechanics so shall get some MAF cleaner and give it a go. Failing that it looks like £130.00 for a Bosch sensor. Thanks again jack.

Hi, Jack, before you buy the cleaner...do you have a multi-meter? If not you can pick up a cheap one in Tesco or Carrefour or the likes that should at least give you the ability to read resistance.

For your MAF you can check for resistance across terminal 1 and 4. It should be approximately 110 Ω. If you get no reading it's gone open circuit and you'll need a new MAF meter.

Also check for resistance on the ETC sensor...values as per previous post.

[volvo2]

I had the same problem this morning on my 1994 petrol non-turbo. I'll read my codes tonight. If it is the MAF, is that relatively straightforward to replace?

What is the ETC. If it is electronic throttle control then I don't have one.

[Luxobarge]

Originally Posted by volvo2

What is the ETC. If it is electronic throttle control then I don't have one.

Engine Coolant Temperature Sensor, more commonly known as CTS, your engine will have one, just below the pipe union on the thermostat housing.

[jack taylor]

Hi Baffler, my mechanic says fault code P0101. Am trying to get my hands on a multi-meter to make sure.jack