[fixer]

Heard the same thing from a field engineer here in Mesa...

Funny thing today:

Car sat for about 3 hours and the temp guage was right at the thick bar just off of "C" and i still heard the noise (although it was very minimal).

So there was still heat in the motor and i still heard it.

And the temps were a bit warm here in the valley (low- mid 70's) and today i fired it up and ran it at the hottest part of the day (3 o' clock) and the noise was also barely noticeable.

 

[fixer]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2002-01-09 12:38, Silver Venom wrote:
Hey guys,
I have the same problem with my Cobra.
After the 1st 1000k miles my car would knock on cold start up and only last for a few seconds. I had it to the dealer 4 times and they did nothing. This was back in May.

Now that it is cold I have the extended knock/tap that you guys described.

I have been reading that alot of the 2001 mustangs have this. It seems like the GTs, Bullitts & Cobras have the same problem.
I not sure of the exact engine differences between the 3 - but whatever is different can be ruled out as the problem (most likely).

</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

Thanks for the input, dude.

The Cobra has a Dual Overhead Cam engine; a DOHC motor. The Gt's and bullitts have the Single overhead cam (Sohc) motor.

Your car has 4 cam shafts, ours has two. The valve train is quite different between the two motors.

I had heard of a few instances on Corral.net of some cobras expereincing this noise.

Start-up knock isn't an issue here with the Bullitts and Gt's. Its the strange noise at or near 3k rpm when the engine is cold or has set for extended periods.

As far as i know NOBODY has been able to reproduce the noise in neutral. and there is no knock in neutral or start-up. But in gear for the first few minutes of driving, the engine sounds literally like a diesel and makes the peculiar rapping sound at 3k rpm.

I have what sounds like classic piston slap; i noticed this the first day i had the car and wasn't really concerned. This rapping noise is out of control. The piston slap i hear is at about 2000-2500 rpm and then at 3k rpm the rapping starts.

Just wanted to make the issue abundantly clear for your sake as well as anyone else's.

This is because i think a few people have mistaken the really really lound injectors as the noise we're talking about. Just best if everyone is on the same page.

 

[fixer]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2002-01-10 06:22, Bushmaster wrote:
did your engine builder say that this is something to be concerned about (the short skirt piston characteristic) or is it an area that needs to be corrected by Ford? </BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>

I talked to a local race engine builder and he said its nothing.