Ford Focus Forum, Ford Focus ST Forum - View Single Post - JRSC just will turn over but won't idle
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Old 11-01-2012, 10:37 AM   #8
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That's exactly what I said the problem was. You need to recheck your vacum lines and make sure that they are set up the way JR sugested.

When you engine fires and runs it creates vacum wich makes the fuel pump relay switch to the "run" circuit.

If it was an injector mismatch problem it would run but would have a rich/lean mixture.
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