sudden loss of power no codes what can it be? 2003 Ford E550 6.8 10 cil.
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from one day to another, started to shake even in idle but gets worst when on gear and in low speed even shakes when running in low like idle driving shakes really bad have to accelerate to avoid shaking, no codes at all changed already MAF sensor, gas regulator sensor, spark plugs, fuel filter, air filter, has brand new trans and motor oil and filters, and the lack of power is pretty noticeable, what else could it be? inspected the motor and trans mounts to and looks fine, any ideas or advice will be really appreciate, thanks
How long has your 2003 Ford E-350 Super Duty had this problem?
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Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
Sudden loss of power and shaking in your despite no error codes can be tricky. Since you've already replaced several components, consider these possibilities:
Vacuum Leaks: Even small leaks can affect engine performance. Inspect vacuum hoses and intake manifold gaskets.
Exhaust System: A clogged catalytic converter or restricted exhaust can lead to poor engine performance.
Throttle Body: Clean the throttle body and check the throttle position sensor (TPS) for proper operation.
Compression Test: Low compression in one or more cylinders can cause power loss and shaking.
Given your thorough checks, it might be worthwhile to consult a mechanic who can perform more in-depth diagnostics like a fuel pressure test or cylinder balance test.
Hope this helps get you back on track!
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