Ls focus surging idle - Australian Ford Forums

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Ls focus surging idle

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28-02-2018, 11:46 PM

#10

DZFord

FF.Com.Au Hardcore

Join Date: Jan 2009

Location: Victoria

Posts: 877

Technical Contributor: For members who share their technical expertise. - Issue reason: LS Focus PCV Valve & Hose replacement, a very detailed write up with photos.

Re: Ls focus surging idle

Have you looked at the OBD data? How are the long and short term fuel trims at idle? Do they improve or worsen with RPM? Is the upstream 02 sensor cycling correctly? Or is it stuck rich or lean? What is the rear oxygen sensor reading?

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