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Trump 2016
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12,934 Posts
Discussion Starter #1
have promblem with my 01 escape v6 when cold hesitates like its running on 2 cylinders no check engine light when warm runs 100% no promblem so i finally scanned it got p1131 lack of ho2s1 switches-lean bank 1 sensor 1 where do i start
 

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I would suspect a vacuum leak. Probably at the intake manifold. So it runs crappy when cold and once it warms up, the metal expands and seals against the manifold sealing the leak and it runs fine again.

The best way to confirm would be to take it to a shop or some place that has a smoke machine and smoke test the manifold and associated vacuum lines. The smoke will come out any leaks to confirm where it is. Be sure to do it when the car is cold though.
 
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