Noise on cold startup - Ford Mustang Forum
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post #1 of 8 (permalink) Old 07-18-2019 Thread Starter
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Question Noise on cold startup

Any ideas what this noise could be @ 4 seconds in the video ? The earlier noise is the e brake



It only happens when the engine is cold(summer 80 degrees+ and winter)
It happens for about 1-2 seconds after it starts up.
When the engine has been running , it will not do it on the re-start.

2008 GT 5 speed 103k miles

These changes have not made any difference:
New SR performance throttle body
New K&N cold air Intake
New Ford performance axle back
Stock tune, Bama tune, 91 octane , 93 race octane, happens on any tune.
New coils
New spark plugs

Other stuff:
Stock exhaust manifold, cats, hpipe.
Clutch- unknown
Oil level is good 1/2's up the low/high range.

Any help would be appreciated!

I was banging around on the cats with my hand but did not really hear anything.

Also i notice a little hesitation when going through 1st and second gear when its cold.
I have a tuner datalog if that helps.

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post #2 of 8 (permalink) Old 07-18-2019
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Quote:
Originally Posted by Chrisjan84 View Post
Any ideas what this noise could be @ 4 seconds in the video ? The earlier noise is the e brake

https://youtu.be/4Vrqur9y-7M


It only happens when the engine is cold(summer 80 degrees+ and winter)
It happens for about 1-2 seconds after it starts up.
When the engine has been running , it will not do it on the re-start.

2008 GT 5 speed 103k miles

These changes have not made any difference:
New SR performance throttle body
New K&N cold air Intake
New Ford performance axle back
Stock tune, Bama tune, 91 octane , 93 race octane, happens on any tune.
New coils
New spark plugs

Other stuff:
Stock exhaust manifold, cats, hpipe.
Clutch- unknown
Oil level is good 1/2's up the low/high range.

Any help would be appreciated!

I was banging around on the cats with my hand but did not really hear anything.

Also i notice a little hesitation when going through 1st and second gear when its cold.
I have a tuner datalog if that helps.
Only with cold engine, noise lasts several seconds only, then disappears, most likely attributable to "piston slap", a clicking rattling noise caused as pistons change direction. Usually this is found in very high mileage engines, but of course it depends on prior history of usage.

If you are not the original owner, knowing the entire history, a previous owner might have installed other than stock-type pistons, such as "forged pistons". Ford factory pistons are "cam-ground", which means they are not perfectly round. The have a steel strut cast into the aluminum on either side of the piston facing at right angles to the piston pin. Purpose is to be able to have near-zero piston to cylinder clearance for quiet, cold, "no slap" start-up, as the steel limits expansion of the aluminum in it's direction, piston expands in the direction of most clearance, until it is actually nearly perfectly round, conforming to the cylinder, with prescribed clearance, of course. This is how it works with factory pistons which are not worn-out badly.

Then, also, as oil is squirted up into the cylinders, audible piston slap is stopped partly or entirely by the cushioning effect of the lubricant. Don't worry about it unless it grows rapidly louder, or does not go away.

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post #3 of 8 (permalink) Old 07-19-2019
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Piston slap doesn't sound anything like that. It's almost certainly something at the top of the engine that's knocking until there's enough oil pressure to silence it. Perhaps a bad lash adjuster or cam phaser. Could also be a clogged VCT solenoid.
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2006 GT Deluxe - 5MT - 12.52 @ 109.33
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post #4 of 8 (permalink) Old 07-19-2019
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5/20 oil - hydraulic lifters draining down while off due to thin thin thin thin oil.


130 total pounds of Pitbull ruled by 8 pounds of cat.
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post #5 of 8 (permalink) Old 07-20-2019
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Quote:
Originally Posted by Dana W View Post
5/20 oil - hydraulic lifters draining down while off due to thin thin thin thin oil.
Still isn't normal though, and 5W-20 is the recommended viscosity.


2006 GT Deluxe - 5MT - 12.52 @ 109.33
311rwhp 328rwtq with basic bolt-ons
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post #6 of 8 (permalink) Old 07-22-2019
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Quote:
Originally Posted by Bullitt95 View Post
Piston slap doesn't sound anything like that. It's almost certainly something at the top of the engine that's knocking until there's enough oil pressure to silence it. Perhaps a bad lash adjuster or cam phaser. Could also be a clogged VCT solenoid.
I also have valve train noise at cold start-up and I just had all the parts replaced! Goes away in under a minute. Only noticed it because I had to get out of the car quick after a start. I'll be pissed if it's a bad follower or lash adjuster that were just replaced. I did have the oil changed from 5W-20 to 5W-30 because it was recommended.

2005 Satin Silver GT
JLT CAI w/Lito Tune
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post #7 of 8 (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by Chrisjan84 View Post
Any ideas what this noise could be @ 4 seconds in the video ? The earlier noise is the e brake

https://youtu.be/4Vrqur9y-7M


It only happens when the engine is cold(summer 80 degrees+ and winter)
It happens for about 1-2 seconds after it starts up.
When the engine has been running , it will not do it on the re-start.

2008 GT 5 speed 103k miles

These changes have not made any difference:
New SR performance throttle body
New K&N cold air Intake
New Ford performance axle back
Stock tune, Bama tune, 91 octane , 93 race octane, happens on any tune.
New coils
New spark plugs

Other stuff:
Stock exhaust manifold, cats, hpipe.
Clutch- unknown
Oil level is good 1/2's up the low/high range.

Any help would be appreciated!

I was banging around on the cats with my hand but did not really hear anything.

Also i notice a little hesitation when going through 1st and second gear when its cold.
I have a tuner datalog if that helps.
I had exactly the same issue. I installed timing chain/cam phaser kit plus Ford high volume oil pump and problem solved 100%.
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post #8 of 8 (permalink) Old 3 Weeks Ago
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Any news on a fix? I have this exact issue. only have 34k miles on the gt now and unsure of the issue.
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