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99 225 OX66 Shuts down at 4400 RPM

S

SODA6943

New member
After cleaning and testing and re-installing the injectors and doing the same to the O2 sensor assembly my 99 225 OX66 still powers down at 4400 rpm. Next suspect low pressure fuel pumps?
Has anyone else experienced this problem?
 
When you say powers down at 4400, do you mean the engine will not rev. past that rpm. There many filters that should be checked on fuel injected engines,also a low pressure fuel pump and a high pressure pump with a screen. Has fuel/water separator been inspected? Get a fuel pressure tester from auto parts store,they might rent one out or loan you one with a deposit. Try pumping primer bulb while running when issue arises,if rpms pick up,fuel delivery issue or weak fuel pumps
 
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