Criner456

New Member
Sep 25, 2016
3
0
1
21
My 2006 v6 mustang seems to have a little rattle or chirp coming from the engine behind the dashboard. This happens when I just start the car and when I accelerate. When I start the car it it's at about 1100 rpm then after 30 seconds goes down to 700 approx. Oil pressure is a tad high.The car has 120,000 miles on it... anyone have an idea what the rattle is?
 
  • Sponsors(?)


MustangIIMatt

I need something stupid to play with
Mod Dude
Mar 7, 2002
8,386
4,182
224
It is more than likely a worn out guide or tensioner on the rear timing chain. The engine will have to be removed and partially disassembled to replace it. I'd strongly recommend doing all of the chains, guides, and tensioners at one time if you're planning to keep the car.
 

Criner456

New Member
Sep 25, 2016
3
0
1
21
It is more than likely a worn out guide or tensioner on the rear timing chain. The engine will have to be removed and partially disassembled to replace it. I'd strongly recommend doing all of the chains, guides, and tensioners at one time if you're planning to keep the car.
How much would something like this cost?
 

MustangIIMatt

I need something stupid to play with
Mod Dude
Mar 7, 2002
8,386
4,182
224
Paying a shop, if it's the chain will the rattle sound be continuous or just when on the throttle?
It honestly depends on how worn components are in there. My buddy's 2005 with the 4.0 V6 started out just rattling at idle and disappearing above. It progressively got worse, getting louder and showing up more often. Eventually, the guide failed completely and the chain was riding on the bolt that had previously held the guide to the back of the engine (meaning it never quit making noise at that point).

Paying a shop you're looking at over $1000, possibly over $1500 depending on the quality of parts used and what they're charging for labor. As I said before, the engine has to be removed, there is a lot of labor there, and then you'll need all of the chains, guides, tensioners, a few gaskets, a few bolts (the bolts in the cams and balance shaft are single-use), coolant, oil, and oil filter, and that's if nothing else is wrong. You'll also need to make sure the shop you use has the right tools for the job, as there are two special service tools involved in the procedure. (I've done two of these, one in an Explorer, one in a Mustang).

It could be something else entirely, I'm making a long-distance shot-in-the-dark best-guess based on incomplete data over the internet without seeing or hearing anything in person, but it sounds like what I've dealt with in person on a few of these 4.0L engines.
 

Davedacarpainter

I think I've messed my pants
SN Certified Technician
Nov 28, 2015
11,544
11,163
193
58
Discordia
@74stang2togo is a smart fellow and you should probably listen to what he says.

Welcome to Stangnet, btw!

Let me move your thread over to the tech section for S197's, other guys there will probably tell you the same thing.

Good to have you with us!