Faulty MAF or turbo?

**krazylegz** · 7th March 2012, 17:33

My vectra c 2.2 dti is still going into limp mode when put under load.

I've tried changing all the vacuum solenoids, checked all vac pipes, changed turbo actuator, new boost sensor

Went to the scrappy yesterday and got another egr valve and MAF as it was showing up P0400 code in opcom and something about boost.

So I put both on, however it's not the correct MAF as its a different number, anyways with both on the spanner light never came on but it seemed as if there was no turbo at all as it couldn't pull the skin off a rice pudding, so tried the old MAF back on today and it seemed a bit better at pulling but back to the spanner light and limp mode coming on.... The car itself feels very very under powered and wondering of the turbo itself could be at fault?

**Caveman_nige** · 7th March 2012, 17:54

What type/model turbo is it Lee? If it hss an internal wastegate the diapraghm may be split as that can cause such syptoms.

**krazylegz** · 7th March 2012, 18:09

Have no idea nige lol..... It's a garret that's all I know lol. I'll have a look on it tomorrow for any numbers etc. I've heard somebody else mention that tbh, just seems really flat and doesn't even wheel spin

**Caveman_nige** · 7th March 2012, 19:49

I will see what I can find out about them later this eve.

**krazylegz** · 7th March 2012, 21:10

Cheers nige your a star

**Caveman_nige** · 7th March 2012, 22:25

http://www.ebay.co.uk/itm/Opel-Vectr...-/220736194965

this is the same turbo, it does not have a diaphragm so you can't change that.. its a pretty straight forward turbo tbh.. i would doubt its the root cause of your problems, its just bottling it when you try to use it which suggests the fault should be elsewhere.. You seem to have changed everything else though.. I would still be looking for holes in pipes, but turbo shutdown and limp mode is generally from the solenoid tripping, normally when it encounters an overboost situation. if you can list the fault codes it may help a bit.. P0033, P0234 or P0235 are suspects, let us know.

When you changed the actuator did you test the lever/arm it connects to to see if the wastegate opens easily as it could be sticky and gunked up, it needs to be smooth or the actuator can't do its job?

actual turbo faults are more obvious http://www.vauxhall-turbochargers.co...leshooter.html

**krazylegz** · 12th March 2012, 17:22

Got this sorted everyone

After changing practically every sensor going I was right with my first original thoughts, the vac pump. Changed it today and I've now done 48 miles in it trouble free, seems to have a load more power too