Expy 2010 rattle sound when 1st start in the morning

erickperez · Jan 4, 2026

Good day,
my 2010 started to experience a "rattle-ish" start but only when it has been parked for a whole day. After that first "noisy" start, it does not happen again. I will say that it sounds like no oil is there and thing start dry, which leads to a rough start.
my vehicle has 195 thousand miles.

I have paid FORscan diagnostic tool so what things can I check?
I will like to ask if this can be related to the oil pump?
a few youtube videos indicate perharps the cam phasers?
I dont have any engine codes on the vehicle.

Thanks in advance for your suggestions.

tongwang1982 · Jan 5, 2026

My 2014 has the same symptom someone in the forum that it is caused by AC compressor? Because oil drained for one nights.

JamaicaJoe · Jan 5, 2026

My 2013 does it . It sounds like the compressor clutch rattle/bouncing. Turn the entire HVAC system off it makes no rattle.

KOTU · Jan 5, 2026

Your issue may very well be one or both timing chain tensioners. The short rattle is caused by the tensioner's interior being dry (no oil) due to a broken gasket. The tensioner vibrates until oil refills the reservoir inside the spring-loaded part. The rattle is typically heard on a cold start-up.

Gregg Eshelman · Jan 5, 2026

My 2007 did that for quite a while. Now it needs timing chains etc. Driver's side has apparently jumped a tooth or two.

erickperez · Mar 9, 2026

KOTU said:
Your issue may very well be one or both timing chain tensioners. The short rattle is caused by the tensioner's interior being dry (no oil) due to a broken gasket. The tensioner vibrates until oil refills the reservoir inside the spring-loaded part. The rattle is typically heard on a cold start-up.

Thanks for the heads up. the vehicle has 150k+ miles and being the second owner I was told no engine work has been done. Time for a timing job then

17expi · Apr 25, 2026

Yep, tensioner

erickperez · Apr 29, 2026

thanks for the information. I opened the engine and besides the left tensioner, one of the plastic guides broke. so I need to drop the oil pan too.

Besides Motorcraft, is cloyes a good brand? it appeared on one of my searches on partsgeek.com

mjp2 · Apr 30, 2026

Stick with Ford parts or you'll be back in there again. While you have things open install an upgraded Melling oil pump and new Ford roller followers.

YouTube FordTechMakuloco has the most in-depth videos on the what and why behind the 5.4 engines and how to properly repair and maintain them. I'm not one for internet personalities but this guy is extremely knowledgeable and is a real asset for those of us turning our own wrenches.

17expi · May 3, 2026

erickperez said:
thanks for the information. I opened the engine and besides the left tensioner, one of the plastic guides broke. so I need to drop the oil pan too.

Besides Motorcraft, is cloyes a good brand? it appeared on one of my searches on partsgeek.com

Don't drop the pan unless it is really broken up. Pieces in the oil pick up COULD be a problem if there are lots of little pieces. I put an aftermarket oil pressure gauge above my gas pedal on the 5.4 Navigator I had. Those stock oil gauges are just idiot lights that come on about 10-12 psi.................ex mechanic

mjp2 · May 3, 2026

Last reply caught my attention...

If you do drop the oil pan, take the opportunity to replace the oil dipstick tube. $26 part and they tend to rot about halfway up.

I just went through the process of replacing the dipstick tube about a month ago and it was rusted into the block. Had to drop the oil pan so I could drill it out without worrying about shavings falling into the pan.

For reassembly, use a new pan gasket, and there are 4 spots on the block side of the gasket that need a dab of RTV to prevent leaks.

17expi · May 3, 2026

mjp2 said:
Last reply caught my attention...

If you do drop the oil pan, take the opportunity to replace the oil dipstick tube. $26 part and they tend to rot about halfway up.

I just went through the process of replacing the dipstick tube about a month ago and it was rusted into the block. Had to drop the oil pan so I could drill it out without worrying about shavings falling into the pan.

View attachment 87069

View attachment 87070
For reassembly, use a new pan gasket, and there are 4 spots on the block side of the gasket that need a dab of RTV to prevent leaks.

Waste of time; sand it down where "rotted", add a coat of JB weld, paint it.........done.

mjp2 · May 4, 2026

To each his own. My truck deserves better than JB Weld.

17expi · May 4, 2026

mjp2 said:
To each his own. My truck deserves better than JB Weld.

Calling it rot shows me that you have no sense of innovation when it comes to simple repairs. You should have chromed that thing were you were at it............lol. I find mind boggling that you went to that much trouble on a simple fix.

17expi · May 5, 2026

KOTU said:
Your issue may very well be one or both timing chain tensioners. The short rattle is caused by the tensioner's interior being dry (no oil) due to a broken gasket. The tensioner vibrates until oil refills the reservoir inside the spring-loaded part. The rattle is typically heard on a cold start-up.

It's almost always one tensioner and they have an o-ring not a gasket. They don't vibrate and the noise is the chain rattling against the guides until the tensioner fills with oil and pushes on the chain. They rattle cold or warm and a lot of people live with it for a long time but if the guides break up into little pieces, they could clog the oil pump pickup screen and drop the oil pressure. If there is just a little break in the o-ring and the rattle is short you can probably get by for years without fixing it. There is no cure for the broken o-ring like heavy oil, additives etc. It's either fix it or cross your fingers and hope the o-ring doesn't blow out of the groove it is in more.

mjp2 · May 6, 2026

17expi said:
Calling it rot shows me that you have no sense of innovation when it comes to simple repairs. You should have chromed that thing were you were at it............lol. I find mind boggling that you went to that much trouble on a simple fix.

Have fun JB Welding your truck :cheers:

17expi · May 6, 2026

mjp2 said:
Have fun JB Welding your truck

More terminology mistakes. It's ok if you are a novice, we all started there.....

thetexasexpy · May 7, 2026

So I also have a 2010 and I do to get a 1 second rattle on cold starts once every few weeks. It's probably related to the timing, but I don't think it's urgent but it's one of the warning signs from what I was told. You'll need to worry if it's doing it every time you start the truck, and it does it when you stop at a stop light.

17expi · May 7, 2026

thetexasexpy said:
So I also have a 2010 and I do to get a 1 second rattle on cold starts once every few weeks. It's probably related to the timing, but I don't think it's urgent but it's one of the warning signs from what I was told. You'll need to worry if it's doing it every time you start the truck, and it does it when you stop at a stop light.

Some people let it go for years with no problem. If the o-ring in the tensioner just has a little piece broken out it could stay like that. Often, they just rattle a second or two in the morning after they had all night to leak down, and then good the rest of the day.

max78 · May 10, 2026

I'm guessing you have it all back together now, but I installed a Melling kit with cast iron ratcheting tensioners and a high volume pump. kit did not come with phasers, those are still original. I would definitely put a high volume pump in there if its still open.

17expi said:
Some people let it go for years with no problem. If the o-ring in the tensioner just has a little piece broken out it could stay like that. Often, they just rattle a second or two in the morning after they had all night to leak down, and then good the rest of the day.

Some people definitely do, but what they don't realize is that oil is bleeding out of the tensioner due to a blown seal and that's causing low oil pressure at the cam shaft. That low pressure can cause accelerated wear, and the head has no cam shaft bearings, it rides directly on the aluminum head. So if it gets too bad you are out a cam and cylinder head. . . This combined with the already low oil pressure the 5.4 has at idle (so much so Ford turned the gauge into an idot light because too many complaints) its really a recipe for disaster.

Expy 2010 rattle sound when 1st start in the morning

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