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Old 05-11-2002, 07:08 AM
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Join Date: Jan 2002
Posts: 177
Engine shutter @ 1300-1500 rpm

Greetings to all forum members,

I've been fine tuning my 72 m117 engine for some time and due largely to the information obtained through this forum it's running allmost "perfect".
One running characeristic that I currently could use help trouble shooting is a slight but very noticable engine stumble/shutter between approximately 1300 and 1500 rpm.
You can feel the engine's power loss in this rpm range.

Thanks in advance for any and all replys.

72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420
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Old 05-11-2002, 10:35 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
If the shudder is continuous during that rpm span I would think you are looking at a lean condition.

If the shudder happens as you pass through that range during acceleration my guess would be a plug wire end. if its plain intermittant but only at that rpm, I would look to the throttle switch (check the 20 accel enrichment steps as the throttle is depressed KOEO key-on,engine-off).

Tell us more about the conditions existing when in failure - a freeze frame so to speak.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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