can a bad pcv valve make the car run rough


Asked by Aug 23, 2016 at 12:09 PM about the 2004 Mazda Tribute DX V6

Question type: Maintenance & Repair

04 tribute is run rough at start up and sounds like a fan blade ticking coming from under intake manifold

4 Answers

Tom Demyan

Might be your engine valves, to an exhaust leak, to a misfire. Is the CEL on?


No lights on


That's the weird thing no engine check light has come on you would think their would be


Check engine lights and the OBD system are geared towards emissions related problems, and not for all engine/trans problems. There are a host of mechanical problems that will never show up as a DTC. I'd get it to a mechanic and see what is ticking. As to your question, yes a bad PCV or elbow can cause rough running/idle.

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