Year of Manufacture *: sept 2000 Engine Code or Type *: M 43 B 19 ( Optional ) Scanner used: Autocom
Hi all , got this one in today that has been worked on by another garage .Customer has had upstream lamda fitted by previous garage (don't know previous fault code but assume same. Found fault code p0170 displayed, Carried out basic checks, smoke tested ok(exh & inlet) so ruled out no external leaks . Checked gas readings and all well within specs , forgot to bring printout home but as far as i can remember o2 .2 , co2 15.4 , hc 20 , co 0.00
On live data noticed long term fuel trim 20% so was thinking towards the line of ccv valve sticking open intermittently .Checked hose to ccv will req changing as its getting on the soft side although not collapsed
I looked on previous posts and ccv valve was mentioned for fuel trim errors and also maf sensor .Couldn't get laptop on to scope maf today . So question is: am i on the right direction thinking ccv valve sticking causing fuel trim errors or potential maf sensor fault ? what would be an ideal voltage/ scope trace for maf on this model ?. Add: lamda sensor looks like a ying tong , ecp sourced apparently
had one in 3 times for this fault code and P0171, first time it had a split breather hose, 2nd time was the diaphragm PCV valve (you can blow through it when faulty) and last time which was nearly 2 weeks ago i replaced the MAF meter with a Bosch one and all seems ok.
Make sure you reset basic settings as you'll not notice any difference until you do. This will reset fuel trims as well.
on June 24, 2009, 9:23 pm, in reply to "