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Old 10-24-2013, 08:47 AM   #1
Join Date: Oct 2013
Default 96 850 T5 misfire when warm - Urgent

Hi, symptoms are as follows:

- Car is fine when cold, runs normally, albeit poor MPG
- Car is fine after even 15 - 20 minutes after starting from cold however shortly after this there is a misfire that seems to disappear under hard acceleration.

average mpg is down from about 23 normally to 13/14. It appears to be over fueling, replaced the plugs today and the old ones that are about a year old were badly fouled with sooty deposits.

Does anyone have any ideas what the problem is? There are no codes to be read.

Compression is also good- was tested 4 or 5 months ago for an unrelated issue.
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