• The Forums are now open to new registrations, adverts are also being de-tuned.

Om651 inlet manifold

Amg 007

Active Member
Joined
Dec 25, 2015
Messages
91
Car
Amg
Hi guys

Has anyone on here changed inlet manifold on a vito 114 cdi w447 om651 2018. Symptoms are limp mode no boost codes P0299 & P2261. Have changed boost sensors /transducers/cross over valves & egr No obvious vac leaks turbo seems fine, no damage to intercooler/hose pipes, turbo Actuator moves freely if i use vac pump.

next was the inlet manifold as im aware its a common issue on om651 engine
Have removed fuel filter housing etc
can see most of the top part of manifold
But again no obvious vac leaks or smoke
When using a smoke machine, so question is could it still be the manifold & should i change it as its a tedious task & don't want to put everything back just to remove again thanks in advance.
 
It’s most common to find a broken bolt on the bottom, usually the second one back from the front. A smoke test usually pinpoints it, but if you peer down by the oil filter housing with a torch you can see the aluminium fins of the oil cooler. If it’s oily on the cooler the manifold is leaking.
 
Here’s a link to the first one I did, long time ago now. Many, many have rolled through my ‘shop since then.

 
It’s most common to find a broken bolt on the bottom, usually the second one back from the front. A smoke test usually pinpoints it, but if you peer down by the oil filter housing with a torch you can see the aluminium fins of the oil cooler. If it’s oily on the cooler the manifold is leaking.

Thanks chap will have closer inspection tomorrow, as mine seems fine from the top
Under fuel filter housing area
Also i can push the flap arm thingy next to the fuel line flaps dont appear to be stuck.
 
Today i checked around oil cooler below manifold with smoke machine running no black soot looks clean no obvious leaks
How can i check the flap motor ?
 

Attachments

  • IMG_2927.jpeg
    IMG_2927.jpeg
    1.4 MB · Views: 24
  • IMG_2929.jpeg
    IMG_2929.jpeg
    1.6 MB · Views: 25
The commercials are not really my area of expertise, but you have codes for an underboost and a changeover valve. I’ve seen an OM651 in w166 ML with the changeover valve code. It was a problem with a solenoid valve which operated the changeover valve. On the ML the solenoid was located on the right hand side of the engine, towards the back underneath the EGR cooler flap actuator. It had a long pipe which went around the back of the engine, over the top of the bellhousing. In that case the solenoid valve was bad. Maybe worth investigating that. It’ll give an underboost code too if that’s faulty
 
Page 26, items 124,125 and 126. The solenoid is on the other side of the engine in the w166. I’m assuming it’ll be similar
 
Could a faulty vacuum pump cause low boost issues, as i have noticed no vac coming from the main pipe from vac pump when i was testing the vac reservoir.
 
Inlet manifold is
Always an expensive fix
 

Users who are viewing this thread

Back
Top Bottom