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Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

Testing MAF sensor without diagnostics help ?

Hello all, is it possible in anyway to test the MAF sensor without using plug in diagnostics ? Is there set voltages etc that should be traceable with a multimeter ?
My TD5 defender seems very very flat unless you constantly have it on boost, put your foot down and nothing seems to happen until the boost comes in, is this normal as this is my first TD5 powered vehicle.
Engine has 58k from new FSH from Landrover and have just done a full service (oils and filters) it is an 04 reg defender 90.
Have been reading on here in the search results that the MAF can slowly get worse and give up affecting performance.
Thanks in advance for any forthcoming advice/help/tips

Chris

18th Jul 2015 3:01pm

Go Beyond

Member Since: 30 Jan 2012
Location: Headcorn, Kent
Posts: 6678

Try unplugging the MAF sensor and see if it makes any difference

18th Jul 2015 3:43pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

ive always found the td5 to be quite flat low down as standard

18th Jul 2015 3:44pm

Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

Cheers I'll try unplugging it and see. Am just a bit surprised how flat it is low down, certainly thought it would go better.
Chris.

19th Jul 2015 7:46pm

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

2004 Defender 110 Td5 DCPU Stornoway Grey

What did you come from before?

I found the same when moving from 300tdi to TD5. Yes the TD5 has the clout up top, but low down, in standard trim, it's take a bit to wind up.

You can also test the maf with a multimeter if you dont have diag.

19th Jul 2015 7:53pm

Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

Evening taazzukcb, previously I had a 2.4 td Hilux and that definitely has more go low down, maybe its the MAF not telling the ecu what it needs to hear ? Is there a set voltage reading you should have from the MAF ?
I am slowly working through things it's got top notch fuel in, new fuel filter, new oil and filters and new air filter, air intake isn't clogged in any way and I am running empty as well. (not loaded with stuff in the back or towing)
Cheers Chris.

19th Jul 2015 8:11pm

Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

19th Jul 2015 8:11pm

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

Looking down the plug at the pins, check Pin 3 Voltage when at idle, should be (I think) 2V or there abouts.

19th Jul 2015 8:51pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

sometimes cleaning the maf will help

remove and spray with brake cleaner , LET it dry , refit

20th Jul 2015 6:13am

Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

Go Beyond wrote:
Try unplugging the MAF sensor and see if it makes any difference

Well today I had some time off and enough time spare to do some jobs. I replaced the cam cover gasket that was leaking oil down the back of the block and also unplugged the MAF sensor as was suggested.
Difference is night and day, goes well now and I would say it is a good 40% better than it is with the MAF plugged in. I plugged it in again and performance is shocking.
I'll get a new one on order this week, anyone have a good supplier of genuine ones /
Cheers Chris.

26th Jul 2015 7:04pm

Go Beyond

Member Since: 30 Jan 2012
Location: Headcorn, Kent
Posts: 6678

26th Jul 2015 7:20pm

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

Any of the indies/parts suppliers will have one. Just make sure it's a genuine/VDO one though.

Cheap ones are notorious for lasting minutes and also giving slightly out readings.

Try all the usual, LRDirect, Island-4x4, Paddocks etc and just go with the cheapest. Some of them chuck in free Del over £50 and a genuine VDO will be somewhere from £60 upwards, so that's a bonus of sorts!

27th Jul 2015 9:18am

Crs90

Member Since: 08 Jul 2015
Location: In my excavator
Posts: 82

Thanks for the help

Chris

27th Jul 2015 6:37pm

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