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Old 01-13-2010, 10:01 PM   #1
6th Gear Member
Join Date: Sep 2008
Location: Oshawa
Posts: 4,537
Narrowing down problems .....

K here it is.

1993 325is

motor have knocking sound at idle from rear of engine bay but runs smooth, and gas milage is horriable, funny smell of melting plastic but nothing is melting???

First I thought the noise was a crank bearing but it's been a few
months and has not failed and motor sound fine at anything above idle

so my thoughts are

1). Bad coil or bad ground on coil


2) cats getting plugged and not flowing at low rpm

thought or sugestions from your experiences.
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Old 01-13-2010, 10:28 PM   #2
Parts hoarding partner...
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Join Date: Nov 2007
Location: Toronto
Posts: 3,411
Richie, those are not uncommon for knocking. My buddies 97 328is did the same thing. Had a slight knock at the back but the motor ran strong and no sign of power loss after months of driving.
You can live with it or throw some sawdust into the crankcase..LOL fill up the slack between the bearing and crank journals..LOL.. just to make sure that you know I'm kidding right??

I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 01-13-2010, 10:35 PM   #3
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Location: Oshawa On Canada
Posts: 898
remove the idea of the cat from your list. if it was plugged you would have flow issues at a higher rpm level and not at idle. smell could be leaking rocker cover gasket. maybe.
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Old 01-13-2010, 11:05 PM   #4
6th Gear Member
Join Date: Sep 2008
Location: Oshawa
Posts: 4,537
It's the compination of things that had me
thinking of the cat. Car is only driven about 20km a day by the fiancé to work and home. Haven't had any spare time latley to really look into it.
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