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Old 08-07-2001, 08:19 PM
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Talking Need opinion - Please read! Thanks...

I own a 1987 300E... I just purchased a new battery, new alternator... When I start my car, the engine shakes and there is a nasty sound; the engine feels like it is fluttering... a few minutes later when the engine warms up, everything is normal.

What do you guys think it is? Any suggestions? Thanks.
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Old 08-07-2001, 08:36 PM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Was the engine doing the same sound BEFORE you installed the battery/alternator?
I wonder if the belt was routed correctly? or if the alternator pulley was damaged. Belt tensioner?
'86 300E
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Old 08-07-2001, 09:03 PM
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Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
If the motor shudders when cold, and only when cold, then likely carbon in the cylinders could be the culprit. But I'm interested whether this problem began after your reported repairs...
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

1995 E500 street car
1986 Porsche 944 Turbo S track car
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Old 08-07-2001, 11:01 PM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
Check the motor mounts. They will cause all kinds of noises. Also if it runs bad when first starting check the fuse in the OPR.
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Old 08-12-2001, 12:23 AM
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Join Date: Feb 2001
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How is it shaking up today?
... Kerry

126 tailed by a 203, 129 leading the pack.
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Old 08-12-2001, 03:26 AM
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stan, what is OPR?
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Old 08-12-2001, 03:35 AM
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Location: Santa Monica, CA
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OPR, often called OVP relay = over voltage protection relay. (unless someone has a better anagram)
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 08-12-2001, 02:19 PM
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There's a black plastic cover behind the battery (late 80's 300E, maybe others). It comes off easily. Once out of the way, you'll see the relay with a 10amp fuse on top of it under a clear plastic cover.

Hope this 10 cent fuse solves your problem.
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