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Code of PO171 erratic engine idle and serious engine vibration

Tiny
POPPASMURF
  • MEMBER
  • 2000 FORD WINDSTAR
  • 3.8L
  • 150,000 MILES
Engine runs rough from idle up to about 2500 rpm then smooths out a little bit. The check engine light does not come on. The intake manifold and gaskets, coil, plugs, plug wires, and fuel pressure regulator were replaced about four years ago. What it acts like is at least one cylinder is firing too soon. Thanks.
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Monday, March 6th, 2017 AT 8:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
Hello,

It sounds like you have a compression problem in one of the cylinders like a head gasket is blown between two cylinders. Please do a compression test and record each cylinder,

here is a guide to help you

https://www.2carpros.com/articles/how-to-test-engine-compression

Please let us know what you find so it will help others.

Best, Ken
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Wednesday, March 8th, 2017 AT 12:18 PM

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