2008 Ford F-150: strange sound

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Old 05-03-16, 11:29 AM
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2008 Ford F-150: strange sound

I everyone,I have a 2008 f150,runs great but when I get to 40 to 50 mph and start going up a hill no matter how steep and hit the gas it makes a chattering noise, I don't feel nothing in the gas pedal and the truck doesn't buck or lose power,it sounds like a heat shield hitting something but I checked them and there doesn't seem to be any loose,does anyone have any ideas what the noise could be. thanks
 
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Old 05-03-16, 11:40 AM
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I recently had a vibration starting about 35 MPH. It turned out to be a universal joint.
 
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Old 05-03-16, 11:45 AM
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Question

thanks, but there is no vibrations, no bucking or power loss,it sounds like something is loose somewhere and hitting drive shaft or something but I can't find anything that's loose it's been doing it for over a year now.
 
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Old 05-03-16, 12:13 PM
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You've ruled out the valves rattling, right?
 
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Old 05-03-16, 12:16 PM
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Most common heat shield to rattle from my experience is on the catalytic converter - you've checked that one as well?
 
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Old 05-03-16, 12:44 PM
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how would I check valves, this is a pretty loud noise,i will check heat shields again, are all shields pretty easy to see, I should of mentioned also if I let off gas sound goes away then when I hit the gas it starts again
 
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Old 05-03-16, 12:58 PM
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Valves will rattle if you're low on oil - has that been checked?
 
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Old 05-03-16, 01:24 PM
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Valves will also rattle if the octane isn't high enough. That usually presents itself when accelerating under a load [like going up hill] One of the better grades of fuel system cleaner is often enough to clean them up where they will run on the grade of gas they used to. If you fill it up with hi test and the rattle goes away - you know it's the valves.
 
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Old 05-03-16, 01:37 PM
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sounds like the engine is pinging have you tried a couple of tanks of higher octane gas to see if the problem still occurs?
 
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Old 05-03-16, 01:49 PM
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my oil is good,i change it every 7-8 thousand with synthetic and check level once in a while,i will fill it with high test tomorrow and see if it goes away,i will let you know either way, thanks
 
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Old 05-05-16, 11:34 AM
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just an update,tuesday afternoon filled it with high octane,so far drove about 60 miles, the sound is about 1/2 of what it was, today stopped and got some lucas additive for valves I will let you know in a day or two where I'm at with it,i'm going to kick myself if this was the problem all along,i never would of thought the valves would make so much noise.thanks again for all your help I'm keeping my fingers crossed.
 
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Old 05-05-16, 12:28 PM
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I thought that I needed higher octane once until I installed single platinum plugs. Then I went back to regular.
 
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Old 05-07-16, 12:11 PM
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thanks,i might look into that,but right now the noise is about 75% gone,i didn't even burn a 1/2 tank of high test yet,i will wait until I go through a couple tanks first if it's not cleared up by then I will try the plugs.
 
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Old 05-07-16, 04:22 PM
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You need the plugs either way. Otherwise, you'll be using high test forever.
 
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Old 05-08-16, 03:18 AM
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Back when leaded gas was the norm I'd run a tank of Amoco's white gas [unleaded - 100 octane] each month. You wouldn't believe how well it cleaned up everything in the combustion process. I don't know if today's less octane hi test will do the same but it might ..... although a tune up doesn't hurt especially if it still has the factory plugs.
 
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Old 05-08-16, 03:46 PM
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I probably need to change them, original plugs108,000 miles, I will see if can get to them myself if not will have to take it to garage,i'm going to run another tank of high test when this one gets low with another bottle of lucas additive ,noise is definitely much better now but not gone and I probably burned just over a 1/2 tank,it sure seems I burn a lot less fuel with the high test. thanks again
 
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Old 05-09-16, 03:46 AM
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At 108k it's time for a tune up, don't forget to replace the ignition wires too if it has them.
 
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Old 05-09-16, 06:46 AM
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I would also suggest you look into Ford spark plug changing issues BEFORE you attempt to remove them.
 
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Old 05-09-16, 11:53 AM
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thanks for the info. after looking at the issues I don't think i'll try it myself,i am by no means a mechanic, and i'll probably do more damage and have to take it to garage anyway.who knew changing spark plugs would get so tricky.
 
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Old 05-09-16, 12:16 PM
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thanks for the info. after looking at the issues I don't think i'll try it myself,i am by no means a mechanic, and i'll probably do more damage and have to take it to garage anyway.who knew changing spark plugs would get so tricky.
Your not going to like what the shops charge to change them either.
 
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Old 05-10-16, 10:56 AM
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probably not,i did read on one of the sites where a guy was charged $4oo because they broke some getting them out, really? is that possible they would charge that much.i think I will will just stick to the high test and additive for now and see if that cleans it up,right now the noise is very little and I almost have to listen for it to hear it and the truck runs good, so unless I truly have to I won't be changing them. thanks for the heads up though on the problems with changing them,i would of never know until I got a bill or broke them myself and then probably a bigger bill.
 
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Old 07-15-16, 04:09 PM
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just an update, it took a while but rattle sound is all but gone, I've been using additives every other tank full of high test, it took a while but it seemed to work. thanks again guy's it's music to my ears
 
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Old 07-15-16, 05:06 PM
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wouldn't let reading about a few problems discourage you from doing preventive maintenance like changing spark plugs per example most are not going to have any issues at all, putting it off would likely only increase the chances of a plug breaking off or being seized in the head.
 
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Old 07-15-16, 05:07 PM
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Your plugs definitely needed to be changed. You may or may not have a problem with plugs breaking when they are removed depending on the engine you have and the build date. Look up Ford TSB 08-7-6 more more information on how to determine if you'll have the problem. This TSB also gives the factory recommended procedures for removing the plugs.
 
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Old 07-19-16, 07:13 AM
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thanks for the info. I will look into it and see if my engine is one of the tough ones and maybe try it,but probably will take it to garage and just have them do it.
 
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Old 08-11-16, 11:40 AM
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update

after getting quote from garage $600-$800 for cell packs and plugs,decided to try it myself, with the help of a friend we got them changed,it took about 4 hours, but well worth it,"none broke but a couple were a little tough" I got the cell packs online 8 for $38,plugs $32. garage wanted $65 each just for cell packs, i'm not sure if there is a big difference in quality but so far the ones I got seem to be working good. rattling in engine seems to be gone haven't heard it since changing plugs, keeping my fingers crossed.thanks again for everyones help.
 
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Old 08-17-16, 04:10 PM
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I went to low test gas, rattling came back, I've been reading about kreen engine treatment, did anyone ever use it, does it work, is it safe for engine?? any suggestions would help, or do I need to go ahead and have injectors cleaned. thanks again
 
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Old 12-14-17, 12:30 PM
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I know this is an old thread and I kept forgetting to update everyone, the rattling sound was not the engine at all, it was the 4wd system, the f150 4wd runs off of vacuum, if you loose vacuum the actuators try to engage into 4wd and that was the rattling I was hearing, when putting the engine under load it could not create enough vacuum to keep actuators from trying to engage. ended up I had a kink in one of my vacuum lines. posting this so if anyone else runs into this problem they will know where to begin to look.
 
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Old 12-14-17, 02:00 PM
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Thanks for the update, always nice to know how things worked out.
 
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