My son has a dedicated Crown Vic that has been running rough, running hot, losing power- he recently went through the normal stuff, including cleaning the filter, replaced plugs and coil packs, etc, but still less power than he should have had following a good tuneup. He had a bad coil pack and a bad thermostat, not too bad I think after after 70k miles on the clock.
Here is the interesting part: the engine miss, and the resulting fuel-rich exhaust, had cooked his cats and plugged all four of them up, which caused the power deficit. We took it to Rays (in Bountiful) who fixed them beautifully by boring out the front two and replaced the rear ones. He did a flow check- they were indeed clogged.
Rays mentioned that they have seen a number of cng cars with similiar problems recently.
Here is the interesting part: the engine miss, and the resulting fuel-rich exhaust, had cooked his cats and plugged all four of them up, which caused the power deficit. We took it to Rays (in Bountiful) who fixed them beautifully by boring out the front two and replaced the rear ones. He did a flow check- they were indeed clogged.
Rays mentioned that they have seen a number of cng cars with similiar problems recently.
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