Asked by Sep 18, 2017 at 12:36 AM about the 1999 Ford F-150

Question type: Maintenance & Repair

I have a check engine light on for a non cat
damaging misfire the shop said on 7 and 5. on an
5. Triton the. Replaced spark plugs and coils still
there shop said it's non cat damaging misfire the
truck runs great no smoking no hesitation no
nothing shop said it could be a valve of some kind
or injectors. Could there be anything else? Like I
said there's no smoking or hesitation of any kind
runs amazing. Any help would be greatly

2 Answers


Once there is a misfire the cat will get damaged. There is no such thing as a none cat damaging misfire. If you already replaced that cool and plug make sure u have good compression and that the fuel injectors are working


I would go to a different shop. Miss-fires will put raw fuel into the exhaust, this fuel burns at the catalytic converter and it can overheat and melt the substrate ruining the catalyst. It all depends how frequent the miss-fire is and how much fuel in not burning. A flashing check engine light will signal this to you.

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