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John Mc
John Mc, Ford Technician
Category: Ford
Satisfied Customers: 6240
Experience:  19 years Ford Lincoln Mercury experience
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I have 2003 ford explorer. 4.0 sohc with a major knocking problem.

Customer Question

I have 2003 ford explorer. 4.0 sohc with a major knocking problem. I have 60,000 miles.
Submitted: 6 years ago.
Category: Ford
Expert:  John Mc replied 6 years ago.



I am John Mc, a Ford dealer technician.

I hope I can help solve your problem quickly and accurately.


There are a few things to check to help find your problem. First is the knock on the top end of the engine or the bottom. If the top you probably have timing chain issues and these can ruin the engine if not fixed asap. If the noise is in the lower end first check that your crank pulley has not come apart. If it has replace it. If this is not your problem then you probably have major internal damage and it would be best to replace the engine. If a new engine is not in the budget you can probably find a good used engine in a salvage yard for under $1000.


If you have any more questions please feel free to ask, it's what I'm here for!


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Thank you,

John Mc

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Customer: replied 6 years ago.

I drove about 30 mile since knocking started. i think might be top of the engine. can it still be repaired.


Expert:  John Mc replied 6 years ago.

As long as it is not misfiring real bad then your valves should be ok. Don't keep driving it, get it checked soon. Timing chains are a big job and they require special tools. I would suggest having a dealer do this work as most dealers have a tech who is very familiar with these repairs.



John Mc

Customer: replied 6 years ago.
not misfiring at all. i am very good mech. just wanted to know if i went through timing chain procedure it will fix it. oil pressure gauge has ben going to 0 intermitently should i replace pump?
Expert:  John Mc replied 6 years ago.

If the oil pressure is fluctuating it probably has stopped up the strainer with parts of the timing chain tensioner. You will need to clean it out. Hopefully no major damage has been done to the bearings. I would not suggest doing this job as the cams have no timing marks, you need a $600 set of tools to even set the timing. No way to mark them you have to have the tools to do it properly.



John Mc