I have a 1999 F150 5.4l. In the past few months the truck has a very noticable rattle that seem's to be coming from the exhaust, or one of the mounting pieces for it. If I lightly push on the exhaust tip it will stop for a split second, which makes me think it's rubbing. It happens only when i'm in idle...?

 

Check the heat shields? They are a common problem area when it comes to rattle noises.

 

I will check out that heat shield possibility, thanks ChrisT

 

my friend's 2000 f150 4.2L has a rattle with its exhaust and when i took a look it was the piece that holds the pipe near the fender. does anyone know what this piece is called and a link where i can buy one?

 

Check all the exhaust clamps also. Or when the truck is off and its cool, get under it and tap around on the exhaust, youll find it.

 

That would be these -

http://motors.shop.ebay.com/i.html?_...506.m270.l1313

 

If it's a shield, - this was posted for the Ford F150 line as well. Ford TSB -



Yea, service was instructed to band clamp lol.

 

My 02 seems to be doing this also. I only hear it when my truck is under a load like pulling a steep graded hill and it seems to make the noise under the drivers side floorboard when the transmission is about to downshift to pull the grade. I have checked all of my clamps on the pipes and they are tight.

 

great! Where to I get these band clamps then? please dont tell me they are a stealership item!!

 

You sure it's not spark knock?

 

it dosent do it all the time it idles and drives fine. plugs were change last year w the coilpacks as well. sound is definatly coming from underneath the engine on drivers side only

 

Have you tried a tank of premium gas just to rule that out?

 

Nah, the hardware should have them. You want 104's = 129mm-178mm. That is what's stamped on the clamps. 129mm = 5"/ 178mm = 7"

 

I clamped them for awhile and it worked for a few years. They started getting noisy again after another tack weld snapped free. That's all they are is tack welded on. I completely removed them after that, busted them off by hand and that was that, - no more noise. You have plenty of heat protection between the cats and the cab. Just look above the converters, you'll see what I mean.

 

yes I have several times