No Oomph.
 

Intermittent loss of torque. No codes, stored or shadowed. Truck goes flat below 3000rpms, acceleration is poor. Vanos has been rebuilt within the past 10K miles. I've replaced both intake and exhaust CAM sensors.

Again, this is intermittent. Some days she runs like a raped ape, plenty of seat of the pants get up and go. It's very noticeable.

I'm thinking MAF - BavAuto has the VDO/Siemens for about 200 bucks. These don't last forever - and I'm looking at my original one right now. Cleaned it with CRC but really no difference.


Worst case - busted cat internals, blocking flow? Yeesh.

Possibly gasoline brand and Fuel filter?

Just did the filter - Been up and down the east coast fueling up everywhere, so no 1 particular brand, always 92+ octane.

Check the DISA Valve.

Brand new OEM german made DISA.

Cleared ALL my adaptations.. it's been good for the past few days, pulls nice and hard around town. I need to start logging and comparing when shit acts up I figure.

Anyone have input on BMWLogger?

BMWLogger – BimmerSoftware.com Don't really want to drop $60 on a logger if it's junk. The demo only lets you read codes.

Paging Otto to see what else he did besides rebuild the Vanos - that is really weird.

Hows the air filter - OEM? intake with aftermarket filter? cleaned recently?

Maybe he didnt reset throttle adaptations after Vanos rebuild? If the plugs/coils are good and fuel pump/filter is good - Idk

AFE Pro filter, brand new.

MAFs go bad, or get lazy without throwing codes from everything I've read.

A bad maf symptom would be the truck struggling, as if it's not getting enough air or fuel - correct?

If you suspect the MAF is bad unplug it. Doing so will cause the computer to use default values. It won't be optimal, will illuminate the CEL, but will allow the vehicle to drive pretty much normally.

Drove around with it unplugged yesterday, just to watch its behavior. Never threw a CEL.

I hooked up INPA, and looked at Error Memory - it was in there - but never threw on the light.

It was running fine, before, it was running fine with the MAF disconnected.

I guess I'll have to wait until it starts accelerating like shit again.

I didn't ask if the DISA valve was old or new. The flap on the DISA valve could be sticking and the whole ideal behind the DISA valve is change the length of the intake runner and thus the oomph of the engine.

Just because it is brand new doesn't mean that it is not the problem.

Another item to check might be the ICV. Check to see if it rattle when you shake it.

Is the AFE filter oiled or dry?

Makes sense. Sticking, like inside the intake due to crud build up? Or sticking from an actual manufacture defect. How would I even diagnose that?

It's oiled so much it's dripping.

lol, nah it's the dry one, I know where you're goin with that. :p:

^^Ahhhh good man! Haha yeah I don't do oiled filters anymore, ever since the dry ones have proven to be just as reliable -

You can remove the DISA valve and move the flap slowly. Don't rotate the flap and let it snap back. Do you feel any resistance throughout the flap as you rotate it?

Holy shit.

3 months old from ECS.

Oh you said don't let it snap back? Well, it can't get more broke.

https://youtu.be/iJm6sImlFd8

^ Video

PS putting 12V 10A to it does nothing.

Hmmm try the G.A.S. procedure first

Let me guess you bought the Vaico valve from ECS and not the Genuine one correct? I would probably send it back and get my money back if its bad and buy the rebuild kit with new and improved flap, parts, and O-ring seal from

G.A.S. Home Page - I rebuilt my OE DISA valve and its been working great for years.

I would say put the rebuild kit on the Vaico valve if that is what you bought but I dont know the quality compared to OE - also if you go on G.A.S. website you can try another troubleshooting procedure - hold DISA flap closed and finger over vaccuum pot hole, then release flap - it should only flap back open like halfway

I bought the ECS kit (w/screws) which the 12 year old who answered my phone call over there said was OEM for this part on the X.

Yeah, IDK about that.

Just bought the Genuine BMW one from them, will ship Thursday. Then mail this piece of shit back for a refund. Guess I'll put it all back together (in my work parking lot LOL I love my job) and motor on for a few days.

Son of a bitch! Thanks upallnight - that was a great call.

Yeah I'm looking at the kit contents that is the Vaico valve - aftermarket

Good job upallnight finding the problem - you're not much of a rebuild guy are you? The G.A.S. kit is very proven, tmv and I among others have had great success and the parts really are stout, if you still had your OE valve I would have either slapped the rebuild kit on or buy the new OE valve with DISA kit installed from G.A.S. - they call it the "Gold Valve"

G.A.S. DISA Gold Valve

I'm boycotting G.A.S.

They don't love us.

Proof!

G.A.S. M54 CCV System Replacement

:P

From your video it appears that the DISA Valve was the problem for no oomph in your X.

Lol yes - CCV system is never going to happen IMO