Re: How test vacuum on 99 Taurus 3.0?

I started a new thread because the original was very far back. To fill you in, though, I followed directions from a site I was referred
to to fix the service engine light which comes on with codes 171 and 174. I cleaned and then replaced the maf sensor, the IAT sensor, one oxygen sensor, the engine control coolant sensor and the dpfe. The car has also been tuned with new plugs, pcv valve and air cleaner. I remain suspicious of a manifold vacuum leak, partly because one manifold bolt wasn't tightened well after replacing the alternator and also because there are few possibilities left. The fuel trims you refer to are the adjustments made by the PCM, is that right?

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