hi everyone, i am new to the forum so bear with me. i have a 05 4.6 l f150. i have had the truck to three different dealers regarding a noise i get on acceleration. the noise is somewhat of a buzzing and sounds like it is coming from the dash. the first and third dealer said it is the intake and the second said it isn't that and they don't know what it is. the noise occurs on acceleration. i agree with the third dealer in that it sounds like it is resonating from somewhere, but i can't figure where. they said it was operating normal, but when i asked them to show me another 4.6 that makes the noise they looked at me with a puzzled look. it is annoying, but not to the point i want to get rid of the truck. only aftermarket part is a green air filter, but the truck made the noise even with the stock air filter. i have tried to check for vaccuum leaks and all of that, but i don't understand the best way. also, the throttle response is very sluggish, and i can tell if the truck may have a miss or not, it has 29000 mi and i plan on changing the plugs this weekend. tonight while in park and idling, i would hit the throttle quickly and it would make this sucking noise and the engine was slowto catch up. i understand it is probably the throttle body opening and sucking air, but is there anything that may be causing the poor response. also, how many guys 4.6s can break the rear wheels loose because mine never could i think it has the 3.55 rearend? Maybe i am asking too much, i know that this is a small v8, someone help.

 

Does it sound like a vacuum leak in the dash ? What kind of buzzing?

Try setting your climate control to "vent" - Then off on your other dial/setting and see if this still occurs.

I would also disconnect the battery and clean the MAF sensor. Disconnect both Pos & Neg cables before removing the sensor to clean.

When finished , reconnect the battery - the truck will reboot and default/reset/relearn- adaptive strategies/trans tables/fuel trims. Sometimes they may get buggy on yuh.

Also IMO, your truck is under tunned from the factory. An XCAL tuner has made a big improvement over stock in the past.

 

yes, it does sound like a possible vaccuum leak in the dash. i mean the loaner truck they gave me had the 4.6 in it, and didn't make the noise and i understand that like everything trucks are different. are there any precautions i should know about cleaning the sensor, it is the one in the bottom of the intake after the filter, right. i think disconnecting the battery may be a good thing to sort of reboot the truck.

 

Yes , you may have a different style of MAF sensor than in this article - but , the same principles apply. I would try cleaning that and a fresh reboot before I looked elsewhere for the problem. It's free and could very well be all or part of the problem.

Good luck

MAF clean Insts. - http://www.fordf150.net/howto/clean-...low-sensor.php

 

thanks for all of your help. i will try that this weekend. i was tinkering tonight in the driveway, and the sound that i am hearing when i hit the accelerator all at once while in park reminds me of the sound that the brake pedal makes if the engine is running and you are in park and press the brake pedal. it sort of makes this suction noise except with the accelerator as you accelerate in drive, it is drawn out and comes and goes as you apply the accelerator. i really don't know if this description is helping. on a side note, i have been looking at programmers, but am a little worried because the torque converter and overdrive servo on my tranny had gone out and had to be rebuilt at 23000 miles. 3000 miles after i bought the "ford certified truck." which a week after my purchase i noticed it wasn't shifting properly and checked the fluid to find it was a quart and a half low. so several trips to the original dealer for no help i took it to another ford dealer who rebuilt what was needed. but anyhow this kind of concerns me about using a programmer, i crave the power, but i don't want to hurt the tranny. even though i have yet to be happy with the shifting of the tranny. lot of questions, sorry for rambling, but first thing is first, i want to fix the annoying noise.

 

Well, now that sounds familiar . I've heard that same type "buzzing" sound on vehicles with a Kelsey Hayes trailer brake set up. Specially when plowing snow. Every time you hit the brakes hard a buzzing down by the KH controller would happen and a red light on the unit would light up lol..

However , I don't think that's what's going on in your case..

 

this is a shot in the dark, as well as my imagination at work caused mainly by me reading the spark plug horror stories, but do you think its possible that this could be a spark plug issue, perhaps one is loose? although i'd assume that if it were loose it would eventually work its way out.

 

Your heads DO NOT have any of the plug issues posted on this site. So , you can rest easy there

 

thanks again for your responses. one more thing i have recently noticed is that occasionally even after the truck has been run, if i park it and then go back to start it, it has started and then shuts off. it has done this maybe three times in the past week. i then just turn the key again and it starts. could this mean anything i'm also considering changing the fuel filter.

 

Huh, yea it could be the filter or regulator. That could be the MAF as well.

Here , print this off for future reference in troubleshooting possible fuel problems.



Also , this site may help in troubleshooting a variety of problems -

http://www.fordscorpio.co.uk/faultfinds.htm

 

so tonight, i tried something with my truck, i put the instrument cluster in to test mode bu holding the odometer button and turn the key on. after test was displayed on the readout, SWEEP GUAGES appeared and the tach and speedometer went up to the max and then back down, all the while making the buzzing, grinding, clicking, whatever noise it is that i hear during acceleration in the dash. is this normal or do i have a problem. the dealer thought i was nuts when i swore to them that it was coming from the instruement panel.

 

Are you able to duplicate it consistently?....If you can't seem to isolate the source yourself then take it back to them and show them what you are talking about. I would also inquire about a calibration update for your PCM. They are updated frequently to solve various driveability issues similar to those you are experiencing.

 

thanks for responding. and yes, it makes the noise during driving. i believe it to be the cluster. as said above when i hold the odometer and turn the key for TEST, SWEEP GUAGES appears and the guages make somewhat of a buzzing and clicking noise. im not sure if the dealer checked this. the tech at the dealer stated that it sounds like the noise is resonating from somewhere and i tend to agree. however, i feel that the cluster makes the noise from the speedometer because as mentioned before it tends to only do it in D,1, or 2. i think that just the vibration and the possible overall strain tends to make it sound like it is intake related. i plan on trying to take it in tomorrow morning, i will post back. i just hope i don't look like an a##. also, i notice a noise typically when climbing hills and there is strain on the engine. i believe it to be engine related, but am not sure. i don't know what pinging sounds like. the closest thingthat i could compare it to would be the sound of someone ringing a small bell. thanks for all of the help. P.S. i'm no mechanic so i apologize ahead of time if i'm talking out of my a@@. This forum is a great source of info.

 

Check this out - https://www.f150online.com/forums/sh...hlight=buzzing

 

my truck makes a high pitch rattling noise under heavy acceleration to. the noise is hard to describe. i have no idea what it is, but your not alone.