mstory22

I have a 2006 F-150 with the 5.4. Working on timing chain tensioners and wondered what these are. I appreciate any help.

Martian

I looked them up before when I was doing the same job on my truck. If I remember right, they're just capacitors and they're only bolted there to get power off the block. They have a part number molded into their side. Look that up.

Martian

Post what you find if you look it up so future users can find the answer in this thread.

mstory22

I've done some more digging and the best I could find was "ignition transformer capacitor" used to filter out engine noise on your radio.

Steve@Tasca

It's an electronic noise suppression capacitor.

Link for info only as it doesn't sound like you actually needed them.

http://www.tascaparts.com/oe-ford/yl1z18801aa

-Steve

tareed94

Neat! I was curious what it was when I did my phasers, but not curious enough to look it up.

jeason15

Its job is to dissipate electronic noise in the ignition system. The reason this is important is because of the type of signal that the cam sensors give out. without it, you get erratic readings from them and it confuses the ECM. They are pretty important.

mstory22

I successfully changed my timing chains, guides, and tensioners. Timing chain slap is gone but now I have a new ticking noise. This noise is not present until the engine warms all the way up. I notice it at idle and at all RPMs. I pulled the oil fill cap off and the noise gets louder. Something under the passenger side valve cover.

I'm guessing its my VCT solenoid but wanted a second opinion. My old tensioners had blown their seals and the VCT is probably getting more oil now that I fixed those tensioners.

Anyone have a different opinion?

Martian

Unplug the VCT solenoid and see if it goes away.

mstory22

Unplugging them made no difference.