MaF problem. 2.2dti

**fuzzyllogik** · 12th July 2012, 14:16

it all started a couple of days ago when the engine went into limp mode on the motorway giving me the old spanner light, called RaC and fault diagnosed maf sensor, drove car home on limp but it got quite rough running and clouds of black smoke until I disconected the maf thendrove fine all be it very slowly, bought a new maf today but it hasnt fixed the limp mode and its still running rough hesitating and almost stalling sometimes with the maf conected... any ideas also noticed the other engine light bottom right of the dash has come on.

**James24** · 12th July 2012, 14:52

Is the new MAF brand new or used? Is it genuine Bosch or a copy?

Do you know what the fault codes are? They will help enormously in narrowing down the possible causes...

**fuzzyllogik** · 12th July 2012, 16:30

Originally Posted by James24

Is the new MAF brand new or used? Is it genuine Bosch or a copy?

Do you know what the fault codes are? They will help enormously in narrowing down the possible causes...

It was a brand new MAF. traced the fault back and it turns out it may not have been my MAF in the first place, my EGR valve is sticking and a boost hose has blown off so no onder MAF readings were way out :-( new EGR valve needed now. gerr

**James24** · 12th July 2012, 17:39

Oh well. You can just re-secure the boost hose as long as it's not damaged. What about cleaning and lubricating the existing EGR? A new one is very expensive...

**fuzzyllogik** · 13th July 2012, 07:16

best quote for an EGR I've had so far is £180, Going to clean up the old one and hope ;-) at least that should buy me some time. Dam computers I'd have probably diagnosed and fixed the boost leak earlier if the computer hadnt stepped in gerrrr then my egr wouldnt have got ****ed by black smoke ah well.

**James24** · 13th July 2012, 12:21

EGR valves always get sooted up.It's just a question of how long it takes to do it, and what the result is - clean or replace.

**clivep** · 14th July 2012, 15:12

I too encountered the infamous 'limp home' spanner this week (Signum 3.0 V6 diesel), and having read some of the threads on here I sensed I was going to be in for a huge bill from my main dealer. EGR valve £400, fitting £200 etc etc .... no thank you!!

I feel so lucky that I was able to find a local independent mechanic - AV Autos in south london - who had been fully trained by vauxhall (he used to work for them then set up on his own) who had all the diagnostic kit and experience to get straight to the problem. It turns out that the EGR valve only needed a clean, but the real issues were low fuel pressure (he cleaned out the pipes and fitted a new fuel filter) and the ECU software on my car was about 4 revisions behind, and had not been updated to the version which included a fix for this problem. (It had had a full service at the main dealer only 6 months ago - I wonder why they didnt include that advice??)

Anyway, long story short, the car is now running better than ever and the bill I got was a fraction of what i would have got at the dealer.