99 e300 intake cleaning interval question - Page 2 - PeachParts Mercedes-Benz Forum

TMAllison · #16 06-01-2007, 01:48 PM

It won't have been used if it was done at the dealer as WIS doesnt call for it.

BioPOWER · #17 06-01-2007, 02:13 PM

FWIW, the EGR only operates at idle. Raise the engine speed, and the EGR solenoid closes. Disabling the EGR would not result in any performance gains becuase it is already closed while driving.

I've only had to clean my intake once in 165k miles, and the charge air pipe from the intercooler (below the IM) has always been clean as a whistle.

WINGAS · #18 06-01-2007, 02:59 PM

Warm, geez man, JUST DRIVE THE SNOT OUT OF IT!

Thats all it needs brother - A DRIVER - good score!

oldnavy · #19 06-01-2007, 04:58 PM

If the MB has a seperate bost sensor like the Jeep CRD does you can disable the EGR simply by unplugging the MAF, but it will set a code and CEL. The effect was 2-3 mpg improvement and added power at take off. I have the CCV vented to a Coke bottle with scouring pad material inside and we never have smoke from under the car, we get 33 mpg highway @ 68 mph and it will light up the 235/70/16 Geolander's like nobodys business. Not to mention the engine is quiter and no oil soaked intercooler hoses or intakes.

My 91 however is bone stock and has functioning EGR and CCV w/o any sign of intake fouling, that said the car was always used as a travel/vacation car and not driven in town.

TMAllison · #20 06-01-2007, 05:04 PM

In my expirience the typical symptom of a bad MAF is no turbo and difficulty pulling more than 3000rpm's on the 606.962.

warmblood58 · #21 06-01-2007, 05:57 PM

Great responses, I will DP car and give it a Italian tune -up, probably clean MAF for good measure and just enjoy it. At this point, I am NOT going to change ATF until 100K. Thanks!

oldnavy · #22 06-01-2007, 06:39 PM

Quote:

Originally Posted by TMAllison

In my expirience the typical symptom of a bad MAF is no turbo and difficulty pulling more than 3000rpm's on the 606.962.

That is usually only true if the MAF also serves as a boost sensor. On the Jeep CRD the MAF only controls the EGR, on a VW it controls both boost and EGR. The way to ind out is with engine off just unplug the MAF and fire it up and drive it, if no boost then, MAF also controls boost. If you notice a power increase or no power loss but a smother idle and smother excellaration then it just controls the EGR. The CEL and code will self clear after about three normal engine startup and shut downs.

Parrot of Doom · #23 06-01-2007, 06:43 PM

The MAF controls more than just the EGR. Unplug it and the car will go nowhere fast.

oldnavy · #24 06-01-2007, 07:16 PM

Quote:

Originally Posted by Parrot of Doom

The MAF controls more than just the EGR. Unplug it and the car will go nowhere fast.

That is true if they used the MAF to also control the turbo boost like VW does in the TDI diesel cars. However if they have a seperate boost sensor like used in the diesel Jeep then all that it will do is shut the EGR off and improve mpg's and general performance. It is a simple test to see, and will not hurt the car.

aklim · #25 06-02-2007, 12:58 AM

Quote:

Originally Posted by TMAllison

Some say pull em and anti-seize them now and again every year to two to keep them from siezing and braking when removed.

Others say dont risk snapping off a perfectly good GP just to see if it is stuck....only pull the bad one and only then if it stops working.

I did mine after 1.5 years and they came out nicely. I would say every 203 years would be fine.

My only issue with that philosophy is this. What might be ok today, might be stuck when you pull it in a year or so. Now, if you are planning to keep the car for any length of time, I'd check them. If not, drive it till you sell it.

aklim · #26 06-02-2007, 12:59 AM

Quote:

Originally Posted by warmblood58

Oh, and gp's have been replaced too and hopefully anti seize was used in installation, I would be surprised if not!

Why not take it out and see instead of hoping?

aklim · #27 06-02-2007, 01:04 AM

Quote:

Originally Posted by warmblood58

Great responses, I will DP car and give it a Italian tune -up, probably clean MAF for good measure and just enjoy it.

At this point, I am NOT going to change ATF until 100K. Thanks!

I'm not a fan of DP in either sense of the word. I took out the injectors and had them tested at 120K and one had bad spray pattern and low pop off pressure. They cleaned it and all was good.

I changed ATF at 60K and found it was quite a bit different color than what comes out of the bottle. At 120K it was only a little darker than what comes out of the bottle.

Parrot of Doom · #28 06-02-2007, 05:11 AM

Quote:

Originally Posted by oldnavy

That is true if they used the MAF to also control the turbo boost like VW does in the TDI diesel cars. However if they have a seperate boost sensor like used in the diesel Jeep then all that it will do is shut the EGR off and improve mpg's and general performance. It is a simple test to see, and will not hurt the car.

Shut the MAF off and the car will show a range of faults, most obvious will be a massive lack of power.

oldnavy · #29 06-02-2007, 07:31 AM

Quote:

Originally Posted by Parrot of Doom

Shut the MAF off and the car will show a range of faults, most obvious will be a massive lack of power.

I guess you don't understand what I had posted, so I will drop the subject for you.

TMAllison · #30 06-02-2007, 11:59 AM

Quote:

Originally Posted by oldnavy

I guess you don't understand what I had posted, so I will drop the subject for you.

I suspect you dont understand that POD and I both have first hand experience with a bad MAF on a 606.962 and each have assured you (both having had them fail) that if you disconnect it it'll accelerate like a 240D on a bad day.