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2004 Mazda MPV Question: No check engine light? but the engine is jerking

 

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muse, Nashville, TN, June 22, 2013, 10:14
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No check engine light? but the engine is jerking
If the light's on, the light indicates that the computer has detected a malfunction in the engine/transmission control system and has no diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner can access the diagnostic codes and data and then be able to give you a diagnosis.
If no light, check out the ignition system. I think that misfire under load is usually poor ignition.
If you want to find a Mazda specialist, here's our directory link for you:

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