Valve rattle

[gj]

I might of should of posted this in the mechanical section.But since I'm mentioning oil..I have a just purchased 95' F-150 300 C.I Odeometer says 243,000.it runs really good,power is good,inside valve cover is clean,doesn't have that blow-by smell.I figure it must of had work done sometime.Only thing in between gear changes,and when it gets in a pull the valves rattle,or lifters.at normal level highway speeds it's fine.I changes to pennzoil y.b 10w30 since advance had a sale with filter.The oil level is still full after about 1,000 miles.Anything to be concerned about?Thanks.

 

[Gary Allan]

Sounds like ignition issues, not lifters.

 

[aquariuscsm]

What oil filter are you using?

 

[aquariuscsm]

After I re-read the original post,it almost sounds like detonation or pinging from using bad gas.

 

[tom slick]

What about when you accelerate hard?

 

[gj]

the oil filter is purolator.it does make the noise when accelrate hard.once it gets going it stops.seems it has to be in a strain to get it to make the noise,thanks.

 

[Chris142]

It's pinging....AKA detonation. Has nothing to do with the valves really. They ain't whats making the noise.

 

[panthermike]

I would try using some good fuel system cleaner and maybe some GM top end cleaner as well.

 

[aquariuscsm]

Try a tank of premium unleaded and see if it goes away.

 

[joel95ex]

EGR ports need to be cleaned. mine did that (accord) until i cleaned out the ports...they were clogged. now i can run 87 with no rattle. my EGR valve was working and had some carbon, but the ports leading into the intake manifold runners were completely blocked....

 

[gj]

THANKS!

 

[lazaro]

esplain 2 me how a valve rattles?

I never have heard that noise.

the only time you might hear a valve rattle is when your piston kisses the valve and the head of the valve breaks off and falls into the cylinder bore.

ever hear your rings flutter?

 

[joel95ex]

valve rattle is just a term given to whatever may be causing that noise. it is the sound you get with, i guess detonation, when you have poor gas, overheating, or clogged EGR passages. 93 octane wouldn;t even get rid of it for me---if the car was hot, and i was climbing a hill in say a parking lot--low speed, I would get that noise. when i cleared out the EGR passages, it went away no matter what gas or conditions were going on.

 

[gj]

Joel that's what my noise is.I'm not a mechanic so lifter /valve noise is all I could come up with to describe it.I guess if it were a mechanical problem it would make the noise all the time,and I guess the engine wouldn't be running as good as it does.If it ever looks like I can get a day without rain I'l look at what you suggested.I would like to ask however can this lead to a problem if it's not addressed ?Thanks again,George

 

[demarpaint]

The 4.9L is a strong long lasting engine, one of Ford's best IMO. Anyway it sounds like pinging to me, I would check the timing, make sure the spout connector is disconnected (if they were using them in that year), and check the timing.

I would also give it a dose or two of a good FI cleaner, like Amsoil PI or Red Line's FI cleaner. That should solve the problem.

 

[rclint]

If it has a mass air flow sensor, most likely that is the culprit. I spent way to long trouble shooting a problem on a 4.0 with the exact problem you are describing. If it has a mass air flow sensor, remove it using the two torx screws, be careful, clean it with a spray cleaner like throttle body cleaner, or a good electric contact cleaner. By the way what you want to clean are the two coil springs at the end of the post, don't break them=$$ for a new MAF sensor. This should be a routine tuneup procedure on Fords.

 

[gj]

Thanks again.I had a 89' with a 302.The egr was trouble.

 

[tom slick]

You've got an exhaust leak at or near the head.

 

[joel95ex]

I would be searching for the how-to on cleaning the EGR passages. it was addressed in my haynes manual but not as thorough as a write-up I found on line. If they have never been cleaned, I am sure they are clogged. Mine were so bad that the hole was completely closed as if a rubber plug was fitted flush with the opening.

 

[ryland]

I recently got this same thing on my new jeep jk. I only had 1400 miles or so on it with no problems then I used that new shell nitrogen gas and my motor started detonating like crazy. I asked some guys at jkowners and they said the same things these guys are either gas or exaust leak. I waited till I had 3/4 tank and put super from chevron in it and have had no problems in the last week. I think there might just be some bad batches of the new shell gas because I had only used regular since I got the car but that was the first time with the new shell. I'd be intristed to know if you used the same gas?