What is your question?
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What is your question?
Engine starts to shake when it’s on idle
How long has your 2004 GMC Savana 3500 had this problem?
2 days
1 Reply
The check engine light flashing is due to an engine performance concern that causes cylinder misfire of the engine - when the engine cylinders do not fire as expected. A monitor shows this to the engine's processor, which then flashes the check engine light. This kind of warning is to get your attention, because continue driving like this will cause damage to the catalytic converter and other important components within the engine. Hands-on testing is required to figure out what is going on. It could be spark plug or coil related. But that's just a guess. It also could be based engine concern related. Do not continue to drive the vehicle if the check engine light flashes and a misfire is occurring. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops