General - 850 tdi flat after 3000 rpm

robbrad · May 20th, 2011, 13:52

new member & new owner of 1996 volvo 850 tdi looking for some advise, the car has 155k on the clock, starts and runs lovely up to 3000 rpm no exesive smoke, a warning light with a green triangle comes on some times, should i be looking at mafs, i have checked all air and vac pipe's all seem in good order, oil and filters done, belts done in 2008, any vew's please.

Digidick · May 21st, 2011, 10:04

Had the same problem on my Passat TDi and that needed a new MAF.

artiedtke · May 21st, 2011, 12:27

be careful, the 850 TDI does not have a MAF, it has what's called a VAF instead (vane airflow), its basically a mechanical flap connected to a potentionmeter.

The V70 tdi although it has the same D5252T, has a proper electronic MAF.

robbrad · May 21st, 2011, 15:07

thanks for that!!!

robbrad · May 21st, 2011, 15:21

thanks for your help, please would u know the best way i can test wether the (vaf) is faulty ?

artiedtke · May 21st, 2011, 15:25

Quote:

Originally Posted by robbrad

thanks for your help, please would u know the best way i can test wether the (vaf) is faulty ?

I'm not really sure to be honest. All i know, is my car goes into 'limp mode' sometimes, and if i pull over and disconnect the VAF and clean out the contacts then re-connect them, the car is back to life again.

How you go about actually testing it i'm not sure.

Don;t be tempted to take it apart either, IIRC someone on here did and theirs never worked again.

Apparently these are £200+ from the dealer.

You may be better off sourcing a second hand one off ebay (they come up sometimes) or alterantively look for one from an Audi A6 which has the same engine, AFAIK they are both the same.

BillB · May 23rd, 2011, 14:34

Quote:

Originally Posted by robbrad

thanks for your help, please would u know the best way i can test wether the (vaf) is faulty ?

You need to read the codes. volfcr will work on a '96 Tdi. See www.ilexa.co.uk

May 20th, 2011, 13:52	#1
robbrad New Member Last Online: May 27th, 2011 22:12 Join Date: May 2011 Location: Neath	850 tdi flat after 3000 rpm new member & new owner of 1996 volvo 850 tdi looking for some advise, the car has 155k on the clock, starts and runs lovely up to 3000 rpm no exesive smoke, a warning light with a green triangle comes on some times, should i be looking at mafs, i have checked all air and vac pipe's all seem in good order, oil and filters done, belts done in 2008, any vew's please. Last edited by robbrad; May 20th, 2011 at 13:58.

May 21st, 2011, 12:27	#3
artiedtke Just one more thing... Last Online: Jul 10th, 2020 14:44 Join Date: Dec 2008 Location: North Wales	be careful, the 850 TDI does not have a MAF, it has what's called a VAF instead (vane airflow), its basically a mechanical flap connected to a potentionmeter. The V70 tdi although it has the same D5252T, has a proper electronic MAF. __________________ '98 V40 2.0T B4204T - died... '96 855 2.5 TDI D5252T - 255,000 miles "Diesel without turbo is like a woman without boobs... sure you can drive it, but there's always something missing."

May 21st, 2011, 10:04	#2
Digidick Senior Member Last Online: Aug 3rd, 2016 22:19 Join Date: Mar 2011 Location: Duffield, Derby	Had the same problem on my Passat TDi and that needed a new MAF.

May 21st, 2011, 15:07	#4
robbrad New Member Last Online: May 27th, 2011 22:12 Join Date: May 2011 Location: Neath	thanks for that!!!

May 21st, 2011, 15:21	#5
robbrad New Member Last Online: May 27th, 2011 22:12 Join Date: May 2011 Location: Neath	thanks for your help, please would u know the best way i can test wether the (vaf) is faulty ?

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