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The check engine light will come on when the ECM detects knock, it will only stay on if excessive knock is detected. I would replace the fuel filter and check your fuel pressure.
Could also be a bad knock sensor as the ECM will also advance the timing to make the engine knock. If on knock is detected when the ECM is doing this it will light the check engine light.
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I have a 2007 Volvo 670. The check vehicle ecu comes on. The fault code is MID 144 PID 191 FMI 5. THe truck won't go pass 1400 rpm, the speedometer doesn't work, the cruise doesn't work, the engine break doesn't work. I have to turn the truck off going down the road at highway speed for about 10 seconds and it'll go back to normal. Can anybody help?