300E Low idle then high idle surge

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300E Low idle then high idle surge

05-11-2010, 05:37 AM

tilac1

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Join Date: Jun 2004

Posts: 212

300E Low idle then high idle surge

When I first start it the idle is very low and uneven, then after about a minute or two it will jump to 1000rpm and then quickly settle back to a normal, somewhat smooth idle. This started happening immediately after I changed the water pump. Did I disturb something?

The OVP and O2 sensor have been recently replaced.

1988 M103, 60K miles

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