my engine light came on... Power loss... What does this mean?

Asked by Aug 04, 2015 at 04:43 PM about the 2003 Ford Expedition XLT

Question type: Maintenance & Repair

03 ford expedition 5.7L... Power loss? when engine is running there is a hissing sound.

2 Answers

190

Check your vacuum lines, a hissing that loud should be easy to spot, but will cause both. To be sure go to parts store and have your code read, sometimes a sensor will break inside and cause the noise.

1 of 1 people found this helpful.

my 99 just did that, and it turned out to be the water T that screws into my manifold. the nipple on it was cracked and it finally broke. I replaced it and my engine light went off and the car runs a lot better.

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