Engine Problem?? 32 valve 4.6 2004 Anniversary Edition Mustang GT - Mustang Evolution

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Old 03-25-2014, 10:52 AM   #1
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Engine Problem?? 32 valve 4.6 2004 Anniversary Edition Mustang GT

We have a 2004 Anniversary Edition Mustang Mach 1 in good shape. We are complete rookies at these cars for starters. We are hearing a vibrating noise around 2000 to 3000 RPMs on the passenger side of the engine and have had the engine looked at by a couple people who say we probably need to get a new engine put in but we can not be certain for sure. It is a 32 valve 4.6L


We are currently looking for a replacement as we are told that it will not pay off to tear the current engine apart, but rather just put a new rebuilt engine in.


Any advice or leads on obtaining this type of engine anyone has would be appreciated. Also . We are in St. Louis Missouri area.
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Old 03-25-2014, 11:46 AM   #2
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Your car should, actually, have a 16 valve engine in it. Or a 2V, as we refer to them. Unless, of course, someone has done a 32 valve (4V) swap to the car.
Almost all of these engines "tick". It doesn't necessarily mean that you need a new engine, it could be as simple as an exhaust leak, or timing chains.
Id get more opinions on this before changing an engine...
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Old 03-25-2014, 11:50 AM   #3
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Where is the ticking noise coming from? Replacing the engine seems a little steep (shops love your money). It could be something as simple as a lifter or an exhaust leak.
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Old 03-25-2014, 11:57 AM   #4
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If its a GT then its a 16 valve, the 32 valve was in the Mach 1s and Cobras..... Easiest way to tell is the size of the valve covers, either they are small or they are huge lol.
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Old 03-25-2014, 12:18 PM   #5
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If that's a 4V 4.6 Mach 1 it would be a shame to have to replace it...
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Old 03-25-2014, 12:27 PM   #6
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Thanks. It is a Cobra. We are calling around to some different shops that specialize in Mustangs and will get more opinions. Ticking is definitely coming from the engine and it wasn't happening prior to this past week, so not a normal noise. I'll keep my finger's crossed it is not in need of a new engine, and will, of course, get more opinions.
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Old 03-25-2014, 02:00 PM   #7
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Found an older TSB that hasn't been 'officially' updated to reflect the same failure on the '04:

Quote:
Originally Posted by norcalsvtoa.com
03-11-04 ENGINE - MUSTANG COBRA - TICK NOISE FROM ENGINE - COBRA VEHICLES EQUIPPED WITH ENGINES BUILT BEFORE 11/1/2002 ONLY*
ISSUE:
Some 2003 Mustang Cobra vehicles with engines built before 11/1/2002 may exhibit an unusual engine tick noise that is present at all temperatures during idle. This noise may be due to valve guide wear in the left bank cylinder head. Guide wear manifests itself as a tick noise which can be heard at the rear of LH head, through LH catalyst, at the LH front wheel well and may not be heard with the hood open.

ACTION:
Use the diagnostic Service Procedure listed below to evaluate the vehicle condition and replace the cylinder head if applicable.
SERVICE PROCEDURE
In order to diagnose noise, the following items must be checked:
- Verify noise by placing a stethoscope on the back of the left head near the exhaust ports.
- Verify that the noise is heard in the left side exhaust system (left side wheel well or catalytic converter, from underneath the vehicle).
- Try to isolate the noise by cancelling the cylinders, by unplugging the injectors one at a time (start with #8 cylinder).
- Verify that there are no exhaust manifold leaks.
- Check to make sure that the camshaft spacers are in place. If not, install cam spacers (per Workshop Manual Section 303-01C) and retest vehicle.
- Check for proper cam sprocket bolt torque, retorque to spec listed in the Workshop Manual Section 303-01C.
- Check for spongy lash adjusters (refer to Section 303-00 in the corresponding Workshop Manual).
- Verify that the timing chain tensioner pin has been removed.

The part numbers for the latest Cobra heads (to fix the tick issue) are:
Left side head
Part # 2C5Z-6049-BAB
Right side head
Part # 2C5Z-6049-CAB

* Please note that this issue was NOT confined to 2003 Cobras built before 11/1/2002 as was originally believed. It has happened on both 2003 and 2004 Cobras. Even on Mach 1s. Also note that the actual percentage of affected Cobras is very small. Also note that the original TSB stated that the then available replacement head was to be used if the driver's side head was confirmed to have the issue. However, it did not solve the problem as some cars with this early replacement head again developed the tick issue. ONLY the replacement head released in 01/2005 (and later) effectively solve the problem as the coolant passages were redesigned on this head. Lastly, this issue has affected a very small percentage of 2003-2004 Cobras. So the odds of any one Cobra developing the issue is minimal.
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Old 03-25-2014, 02:06 PM   #8
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Old 03-25-2014, 05:25 PM   #9
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Quote:
Originally Posted by PHASS View Post
Thanks. It is a Cobra. We are calling around to some different shops that specialize in Mustangs and will get more opinions. Ticking is definitely coming from the engine and it wasn't happening prior to this past week, so not a normal noise. I'll keep my finger's crossed it is not in need of a new engine, and will, of course, get more opinions.

Have you checked the oil? The 4.6 2V uses exactly 4.8 liters (sorry I'm Canadian) of oil. The 4V definitely uses more. If you have enough oil maybe it's the incorrect grade. Do an oil change with the correct quantity and grade, then check for ticking again. If it's still there, then refer to the previous post about the TSB.

Good luck!
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Old 03-25-2014, 05:34 PM   #10
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Post has been updated due to a couple errors BTW!!!
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Old 03-25-2014, 06:02 PM   #11
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A mach is still good!

If the noise is coming from the left side (drivers) of the engine that TSB is the likely culprit.
Make sure that you're NOT replacing the head because of an exhaust leak though.
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Old 07-19-2014, 02:39 PM   #12
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Quote:
Originally Posted by PHASS View Post
We have a 2004 Anniversary Edition Mustang Mach 1 in good shape. We are complete rookies at these cars for starters. We are hearing a vibrating noise around 2000 to 3000 RPMs on the passenger side of the engine and have had the engine looked at by a couple people who say we probably need to get a new engine put in but we can not be certain for sure. It is a 32 valve 4.6L


We are currently looking for a replacement as we are told that it will not pay off to tear the current engine apart, but rather just put a new rebuilt engine in.


Any advice or leads on obtaining this type of engine anyone has would be appreciated. Also . We are in St. Louis Missouri area.


Any updates?


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