Minor Performance Issues M104 - Page 2 - PeachParts Mercedes-Benz Forum

jlomon · #16 07-03-2007, 03:01 PM

Quote:

Originally Posted by gmercoleza

I replaced my MAF and the M104 now appears to be working properly. No flat spot or hesitation anymore! However, I should add that it is still a bit notchy and less linear in acceleration vs. the M103. In particular around 3000 RPM it appears there is a marked burst of power. Sort of reminds me of very mild turbolag.

That is the point where your variable length intake runners/valve timing kicks over to the higher RPM setting.

suginami · #17 07-03-2007, 04:57 PM

Quote:

Originally Posted by jlomon

That is the point where your variable length intake runners/valve timing kicks over to the higher RPM setting.

Exactly....my W124 E320 had a slight bump when this happened, sort of like a turbo kicking in.

Hatterasguy · #18 07-03-2007, 05:29 PM

The M104 in my friends S320 is smooth as butter to redline.

Your plugs are probably dirty or something.

Arthur Dalton · #19 07-03-2007, 06:01 PM

On a 104 HFM/SFI , if you DON'T feel the Runners change length and the cam advance , THEN there is something WRONG..this is a Performance power-plant, and when Engine Management calls for the power/load intake runner matching and cam valve advance mapping , it is a noticable change ...don't compare the power/torque range habits of a 104 to a 103 .... 104 HFM/SFI is a full electronic, distributorless, high performance engine and has nothing in common with a 103 engine.
They are light years apart.

gmercoleza · #20 07-03-2007, 06:22 PM

Quote:

Originally Posted by Arthur Dalton

On a 104 HFM/SFI , if you DON'T feel the Runners change length and the cam advance , THEN there is something WRONG..this is a Performance power-plant, and when Engine Management calls for the power/load intake runner matching and cam valve advance mapping , it is a noticable change ...don't compare the power/torque range habits of a 104 to a 103 .... 104 HFM/SFI is a full electronic, distributorless, high performance engine and has nothing in common with a 103 engine.
They are light years apart.

Thanks Arthur, I feel much better. Like I said, it is smooth as glass now. It just seems to have a performance notch around 3000 RPM where a sort of turbo boost kicks in. After researching more of the technical aspects of the M104, this now makes sense. However, though primitive in comparison, I still love the M103. You are correct, though - they are light years apart.

jas2wa · #21 08-08-2007, 03:19 PM

gmercoleza-

Is this the part you are referring to as the MAF? AKA mass air meter? Thanks, J

gmercoleza · #22 08-09-2007, 10:26 AM

Yes, that's it. Technically, I believe it is actually an Air Mass Meter, or AMM. I should also report that, after installing a new AMM and fuel pressure regulator, the car runs wonderfully smooth, all the way up to redline. It still has that turbo boost effect at 3500 RPM, but I understand now this is normal, and it has grown on me.

Benz124s · #23 08-10-2007, 12:05 PM

Did the MAF fix your starting problem? My ' 94 E320 had the same kind of problem, only without the hesitation under acceleration. My car had 206K miles and would still pull right up to redline very smoothly. It was a blast to drive. Now I'm driving a ' 99 S420 which I love, but sort of miss the E.

jas2wa · #24 08-10-2007, 01:10 PM

I have no starting issues whatsoever, just the slight feeling of hesitation. I haven't gotten around to changing the air mass meter yet, but I feel like it is getting worse so it will be time soon. Just have to cough up the couple hundred bucks for the part..