4.0L SOHC noise - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-05-2010
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Icon9 4.0L SOHC noise

my 2005 ranger, 4.0L 5spd 4x4, started to make a LOT of noise coming from the valves (i think). i still need to diagnose it further. i will be doing a compression test on each cylinder to find my problem....
if i need to pull the engine and replace it would it be worth it since it is out to put on some headers? will i get any performance from them, better sound, fuel mileage?
how much difference would an electric fan make?
how about a mild cam?



any suggestions on ways to fix this problem or ways to get more performance out of a new engine would be awesome! please help a brother when he's down!
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Old 07-05-2010
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sounds like the infamous SOHC timing chain rattle. as far as i know, its unavoidable on older SOHC's and isn't doing any damage..
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Old 07-05-2010
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I thought the timing chain problem was supposed to be fixed halfway through '03 or something like that.
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Old 07-05-2010
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i thought it was the 06 and newer trucks that got the fix
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Old 07-05-2010
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How many miles are on your truck?
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Old 07-05-2010
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Does it do it at idle? And sound like the old ohv lifter noise? My 05 has a slight tick i notice when parked next to something. Ever since i used 5w30 its been very quite. And anything i have ever read the timing chain rattle was fixed in 03.
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Old 07-05-2010
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No it's not the chain rattle. I know that for fact. Truck has about 92000k on it. I have talked to some of the mechanics I work with and they told me it's most likely injector knock caused by the dead alternator. Injectors can't open properly because of the low power. I have a 130amp alternator ordered and hopefully by Wednesday I can put it on and try it out
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Old 07-07-2010
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Interesting, let us know if the charging system repair fixes it. Thanks.
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Old 07-07-2010
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Nope new alternator did not fix it. I did a compression test on cylinders 1,3,6 today... Cyl 1- 158psi, cyl 3- 90 psi, cyl 6- 155psi. My haynes manual says all cylinders should be within 15psi of each other... Minimum of 100psi. So at least now I know I have bad compression. Next step is to find if I have a faulty valve or piston in cylinder 3
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Old 07-07-2010
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Is it worth it to put on a set of headers and an electric fan when I replace the engine?
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Old 07-08-2010
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Is there anyway you could take a video of the noise? Did you try putting a little oil inside cyl3 and redoing it? Thats odd how it would just give up unless something else caused it. Its not like it has tons of miles.
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Old 07-11-2010
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I think the engine has been sucking in a lot of dirt. I have noticed recently that everytime I open the hood I have to reposition and relock the air box clips. I am going to start pulling the engine apart this evening to see what I can find.
I had a nice vacation this weekend so I'm ready to get my hands dirty!
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Old 07-11-2010
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And does anyone know if I can use an older 4.0L engine in my truck if I can't find an 05 or newer???
And are headers worth the money... It's a lot easier to install them while I have the engine on a stand
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