Hi All,
I bought this car about a month ago and it's been a bit of a nightmare...
I was getting fumes in the cabin so had the exhaust manifold replaced to a cast iron one. The old manifold, as expected, had cracks - 6 cracks actually. Since the part was replaced, the car now has no boost. Revving the engine when parked you can hear the turbo spool up, but the revs rise pretty slowly, and the car has no boost when driving. There've been no warning lights come up.
I'm thinking a blocked DPF, but I don't know why there'd be no warning light/message, and I'm surprised at how well the car was running before the manifold change if it was blocked... Any ideas at all??? Thanks!!
Probably just a reassembly error, when I changed mine I managed to get dirt in two of the injectors and it ran like a pig afterwards. Had both injectors refurbished and now back to normal.
Imagine there is probably a connector off or vacuum hose not reattached properly, perhaps the snorkel to the turbo is not fitted properly or one of the induction houses from the turbo to the intercooler is not properly connected.
Unlikely to be anything to do with the DPF, but worth getting the fault codes read just to check
Thanks for the reply Matthew. I thought it was probably a turbo pipe too, but the guy who changed it has had a look and is convinced that everything is where it needs to be. I guess a fault code read is the next step. If the DPF is blocked, do you know if it will always throw up a code?
Thanks, Charlie
Yes it will throw fault codes! I was thinking about the problem and would check the cable connection to the turbo. They use electronic actuators either way get it on BMW inpa software and do some proper diagnostics
That should not affect the power but if three or more glow plugs fail the DPF will not regen and if that happens you will get considerable power loss. If will be a failed GP controller for that many failed plugs.
So probably the DPF after all. Surprising that it was running ok before the manifold was replaced - I guess it was just forcing all the gas out of the 6 cracks! Still seems a bit odd though...
Id also be inclined to think its a vacuum pipe split/cracked or not connected somewhere. Were any of the pipes changed? Also check the canister for cracks around the plastic inlet and outlet pipes.
My boost leak turned out to be a pipe to the canister that had been changed for a slightly larger one
No pipes were changed. I'm taking off the DPF today to see how the car runs without it and to see if's it's blocked, then I can't start the process of elimination...
Bet something is not plugged in properly in that case, when I did mine it was a pretty major job as you need to take the rocker cover off which means taking all the injectors out. Also check this connection (red circle), sometimes it looks like it is on but it is not, and the circlip can break
I'll check that later on. I tried taking off the DPF myself yesterday but a few of the bolts were pretty badly corroded, so just getting a garage to cut them off so I can check that. Will post back later when I know more. Thanks for all your help.
I don't 100% trust that given that it hasn't already thrown up a fault code. Pretty easy to take it off, not a big deal, and I get to see it with my own eyes!
Just to confirm... On my model - 09/2004 - the DPF is in the middle of the car isn't it? The guy today was convinced that it was the cat, and that to DPF was bolted not the turbo, but isn't that the 2006+ models? but I'm pretty sure it's the DPF! All these 'professionals' with so much conflicting information....
Yes, that's DPF in the pictures. M57N models (E60/61 ->9/2005) have that separate DPF. M57N2 engines have cat and DPF in the same package right after turbo.
Wrong wrong wrong, that is the CAT DPF is bolted directly to the turbo, mine is a 9/2005 model and I can guarantee that is the CAT. Where are the pressure sensors a DPF needs? Look on realoem.com for confirmation
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