Can a bad MAF cause a EGR trouble code? OM 606 - Page 2 - PeachParts Mercedes-Benz Forum

TMAllison · #16 10-29-2008, 06:25 PM

You dont need to pull the batt cable.

The ECU will re-adapt itself.

muleears · #17 10-29-2008, 06:33 PM

Quote:

Originally Posted by TMAllison

You dont need to pull the batt cable.

The ECU will re-adapt itself.

I have driven 100mi. since the new MAF was installed and no improvement in power. I checked the vac. lines again and all look good. I guess next step is pull and clean the EGR. I have not done it in the last 30K mi. and I don't know what was done prior to that.

KarTek · #18 10-29-2008, 08:52 PM

Quote:

Originally Posted by muleears

KarTek,
I've checked, but I'll check them again shortly. I swapped the actuators (turbo and EGR) and found no difference. Could they both be bad?
How are things in Ba HAY ma?

Ha, Bahama's the same, boring as ever...

You know, when I left the EGR vacuum line off by accident, I was getting all the same symptoms. No boost, trans hung in every gear - nearly to redline and when I really pressed it for more power, it wouldn't shift at all, even when I let off the throttle.

Now, I'm wondering it you have a slight leak somewhere - maybe the EGR diaphram has a small leak?

If it was me, I'd put a mity-vac on the little wye at the front of the brake booster and try to pull a vacuum while the engine is running to see if it holds.

Just a thought.

muleears · #19 10-30-2008, 05:26 PM

I'm about back where I started. Car still runs smooth and slow but now I have both codes again P0100 and P0400, EGR and MAF. What should I do to it this weekend?

muleears · #20 10-30-2008, 06:31 PM

In further searching I have found that a weak battery and the K40 can cause these same trouble codes. Anyone else have this experience?

TMAllison · #21 10-31-2008, 01:10 AM

Haven't heard of that one but a weak batt can cause all kinds of other fun so is possible.

Drive around for a while with the CCU on screen 23 and observe voltage. Press rest for 5 secs. Toggle using auto buttons to #23.

muleears · #22 11-12-2008, 03:57 PM

Finally got a chance to do this, life gets in the way you know.

Anyway, drove home with the ccu set to display my voltage, here are the results:

at highway speed min. load 13.1-13.3 volts
highway speed with high beams and fan on high 13.0 volts
stopped at light with high beams and fan on high 12.2-12.7 volts occasionally dipped below 12

Don't know what this means, hope someone can tell me.

pimpernell · #23 11-12-2008, 05:06 PM

Quote:

Originally Posted by muleears

Finally got a chance to do this, life gets in the way you know.

Anyway, drove home with the ccu set to display my voltage, here are the results:

at highway speed min. load 13.1-13.3 volts
highway speed with high beams and fan on high 13.0 volts
stopped at light with high beams and fan on high 12.2-12.7 volts occasionally dipped below 12

Don't know what this means, hope someone can tell me.

That seems a little on the low side. I have a scanguage attached to the obd port, and with the glow plugs activated, lights on, and fan at half speed, the voltage is about 11.9. When the plugs cycle off, the voltage goes up to around 12.5 to 12.9 at idle. Anything above idle ranges 13.5 to 13.7
Good luck