Hey everybody new to the forum here and just asking for some help on this truck. Its been a few months already that it keeps doing this after a normal drive from dropping off the kids or going to work. Everytime i turn it off it does the chime or whining noise that comes off the intake, but nothing there ive cleaned, checked, and made sure the k n filter is clean and oil properly maybe it coming from the throttle body or something deeper. And also this dam spark plug keeps sending a CEl everytime it rains or is moisty outside ive changed spark plug(motocraft) and plugs from dealer for all of the cylinders, before this it use to throw random cylinder 3,6, or 5, but know its stuck on 1.

The truck is stock except for just the k n filter just a filter not the intake.
200,xxx miles with a timing chain replacement at around the 190,xxx to 180,xxx miles. And that's all iv'e done to her.
Also i can hear this sound while driving its faint, but i sometimes hear it. it sounds like if ur opening one of those mexican glass sodas, but it sounds somewhere in the engine.
Thanks,

 

is it throwing any codes? if so post the EXACT thing it showed. also what year? is it PI or NPI? small stuff like that could be the difference between us being wrong or right. there are several different variations of the 4.6 in the motor world.

 

Yeah sorry about that its a 2002 f150 triton xlt 4.6l,what is PI and NPI? and the only codes is throwing was cylinder misfire #1, but thats only when it rains or is moisty or foggy outside and thats the only cel it throws.

 

The different head types for the modular motors. PI stands for power improved. you have larger intake ports in the head, and sparked by COP's wheras the NPI (non power improved) have smaller intake ports and have coil packs. when you changed the plugs did you replace any COP's or just plugs and wires. check the COP's for cracks and replace if needed. but with 200k id bet a whole new set wouldn't hurt anyway. before you ask COP stands for Coil Over Plug.

 

no i just replace all the plugs and spark plugs. i just searched up the COPS in google images and if its right you mean that cylinder that holds the spring inside the plug then yes all new and motorcraft.

 

did you torque the plugs to the proper spec? i spose that could throw you issues as well. i'm out of ideas at this point. hopefully MGD or jbrew come and back me up on this...

 

Yeah ive read some forums on this issue and supposely is how the engine or the spark plug holes are made/located that water can drip into the hole or moist can build up in there and u know how water can sometimes be an a** and seep through the tiniest gap. But what about that whine is it normal it just started doing that out of the blue it sounds like it comes out of the TB and i can hear it from the intake.

 

Clean the vacuum regulator for the EGR operation.
It has a round cap with a filter under it.
Likely your hearing the leak down of the EGR due to a clogged third port on the vac regulator that controls it.

On the coils, make sure you use dielectric grease at the boot tips and put some around the seal area that goes against the cylinder heads.
Look for some sort of rain leak from outside.
If any coil has potting deterioration on the tops, seal with silicone.
The ignition system should not be that sensitive to moisture.
Good luck.

 

Ok just to be correct the vacuum regulator is the EGR valve or is it connected to it by hoses as seen by some pics in google. And yes iv'e also added that grease to the coils.

 

Vacuum from the intake is routed to a control solenoid that is operated by the computer to 'gate' vacuum to the EGR for it's control.
The solenoid (EVR) is a three port device.

It passes engine vacuum to the EGR to open it.
Once it is opened, the EVR has to let air back in (the third port through the filter) to allow the EGR to set back on it's seat, quickly under it's spring pressure..
Often here is where the sound comes from.

 

Is this the part you are referring to Bluegrass?? :

 

Yep that should be it that's the one i saw in the pics ill find it clean it along with the EGR valve and update on the weekend thanks guys.