Noise on cold startup - Ford Mustang Forum
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post #1 of 11 (permalink) Old 07-18-2019 Thread Starter
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Question Noise on cold startup - RESOLVED !! CAM PHASER VVT

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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Last edited by Chrisjan84; 2 Weeks Ago at 11:00 AM. Reason: Fixes the issue
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post #2 of 11 (permalink) Old 07-19-2019
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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 11 (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 11 (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 11 (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
314rwhp 330rwtq with basic bolt-ons
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post #6 of 11 (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
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post #7 of 11 (permalink) Old 08-23-2019
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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.
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 11 (permalink) Old 08-27-2019
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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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post #9 of 11 (permalink) Old 2 Weeks Ago Thread Starter
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Unhappy Got worse. Cam phaser fell apart. Dorman..

The noise got worse. Now it is doing it all the time. Video of the continual noise..
I suspected cam phaser on the driver side.

My plan was to get the lockouts and put those in. ~20$ on amazon.
I removed the cam phaser and it completely fell apart. The three pins in there just fell out.
I noticed the logo on it is Dorman. I see very bad reviews on those.
I have emailed Dorman and asked if they would honor their lifetime limited warranty. I suspect they will not without a receipt. I called summit racing a seller of Dormon and they said they would not honor the warranty without a receipt. I guess its not like craftsman tools...

I guess my options are to buy the one from Ford for $250, or try to re-wind the one and try to get the pins back in , and install the Dorman lockouts I am seeing around online. Or purchase another brand, Rock auto has several options.

I might pull off the other valve cover and check out if that has a dorman or not..
I have also email Lito to see if he can give me a tune with the lockouts in place.

Any thoughts on a good brand?? Rock auto options picture attached.
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post #10 of 11 (permalink) Old 2 Weeks Ago Thread Starter
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Talking Resolved!!!

I replaced the CAM Phaser and that resolved the issues 100% . No more startup noise, and no more sounding like a Diesel. I purchased the NEW ford OEM one from Amazon for 170$ . Local ford dealership had it for 250$. 1 hour install.
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post #11 of 11 (permalink) Old 2 Weeks Ago
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Plan on replacing the other side soon too (assuming that both sides were replaced with Dorman) as preventative maintenance.




2006 GT- Airaid Race CAI, 62mm BBK TB, SR Performance UD Pullies, FRPP Hot Rod Cams, CMDP's, Excedy Stage One Clutch and lightweight flywheel, Pacesetter Long Tube Headers with matching O/R H-Pipe & MBRP Street Axlebacks, Lito 91 Octane Tune
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