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Cold start one second long awful engine sound

Jettech1

By Jettech1
in 6.6L Gas V8 (L8T)

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Jettech1 Senior Enthusiast

Jettech1

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16 minutes ago, Pryme said:

Does yours prime more than once? 
mine will do it up to 3x depending on the sequence of doors opened and on a morning cold start, as shown on the video. 
mid I open the back door first it will prime or even dropping the tailgate will make it prime. Seems odd. I feel it should only prime if drivers door is opened or key turned. 
 

test yours cold once by dropping tailgate or opening rear doors. 
 

 

I'll let you know later on tonight when I get home from work.

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newdude
newdude

Is the oil level good?  On your paperwork, is there a p/n of the oil used?  Did they install a PF-63 filter?     Can you give us a video of a cold start?   Without hearing it I'm l

sheath
sheath

Yep that's it.  Dealer told me the same as Newdude said.  So now I sit in the kitchen and remote start it while it's in the detached garage (about 40' from the house).  As Sergeant Schultz s

newdude
newdude

It will spike to high pressure on the gauge in the dash.  If you watch the oil pressure driving on these gen 5 engines, around 3500rpm the oil pressure spikes from say 40-50psi to about 70psi.  That's

Pryme Senior Enthusiast

Pryme

Posted
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14 minutes ago, Jettech1 said:

I'll let you know later on tonight when I get home from work.

Mine will only do multiple times when sitting overnight. So if you’re has been sitting that long it will be a good test. Try dropping the tailgate then the rear door for testing. 

Flatus Enthusiast

Flatus

Posted
Posted

Mine sounds like that when I unlock and open door but as far as I know it only does it once.

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Pryme Senior Enthusiast

Pryme

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1 hour ago, Flatus said:

Mine sounds like that when I unlock and open door but as far as I know it only does it once.

Mine will do it once if I do the driver door but let’s say I do the back door first than front door or drop tailgate first it will probably do it twice. And it’s also not consistent if it does it on the key turn or not. So strange only vehicle I’ve had like this

Jettech1 Senior Enthusiast

Jettech1

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12 hours ago, Jettech1 said:

I'll let you know later on tonight when I get home from work.

I wrote a check that can't be cashed tonight.  I don't know what I was thinking, I work at the Atlanta Airport.  I couldn't hear a thing....go figure... LOL!!!  Anyhow I'll check it tomorrow before I go to work and let you know tomorrow evening.

Pryme Senior Enthusiast

Pryme

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36 minutes ago, Jettech1 said:

I wrote a check that can't be cashed tonight.  I don't know what I was thinking, I work at the Atlanta Airport.  I couldn't hear a thing....go figure... LOL!!!  Anyhow I'll check it tomorrow before I go to work and let you know tomorrow evening.

Oh man that must be a stressful work environment 

Jettech1 Senior Enthusiast

Jettech1

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10 minutes ago, Pryme said:

Oh man that must be a stressful work environment 

Nah, not after working there for over 35 years.  A walk in the park..Just noisy...lol

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Pryme Senior Enthusiast

Pryme

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Just now, Jettech1 said:

Nah, not after working there for over 35 years.  A walk in the park..Just noisy...lol

Wow, retirement must be close. Are you an airline mechanic? Just going off your screen name

Jettech1 Senior Enthusiast

Jettech1

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21 hours ago, Pryme said:

Wow, retirement must be close. Are you an airline mechanic? Just going off your screen name

Yes and yes.  I started at Delta in Atlanta when I was 20 years old, right out of tech school that I went to in Boston.  I'm probably going to hang out until I hit 62, another 6 years.  It's been a hell of a ride but I've always made great money and have flown all over for free.  So it's been a very rewarding career that has afforded me and my family many great memories traveling and a great life too.  I'm very blessed and never forgot where I came from for sure!

Edited by Jettech1
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Jettech1 Senior Enthusiast

Jettech1

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23 hours ago, Pryme said:

Mine will do it once if I do the driver door but let’s say I do the back door first than front door or drop tailgate first it will probably do it twice. And it’s also not consistent if it does it on the key turn or not. So strange only vehicle I’ve had like this

Got some info for you.  So today, I tried my best to make the fuel primer pump go off more than once.  I tried everything, rear door first, front door first, tailgate first, locked it again, tried it other ways, key in the ignition, etc etc....Believe me, I tried all combinations that I could.  The pump primed once when I first unlocked it and never did it again.  No matter what I did, I couldn't make it do it twice.  In all honesty, I have no idea why yours likes to do it more than once.  I could speculate about a possible bad check valve in the fuel system, but in all honesty I don't know if there is one.  I can assume there is one in the system, but every time I assume it generally doesn't work out well for me.  If your truck starts up when you want it to, I'm not sure I would worry about it too much.  And the sound you posted from your pump, sounds exactly like mine.  I don't know what else to try to help.  Edit: I was just thinking that most pumps have a built in check valve to maintain the pressure they just built up.  Perhaps you could find a diagram of the fuel pump and see if it has a check valve built into it.  A failed check valve is all I can think of that would make your pump prime more than one time initally.

Edited by Jettech1
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Pryme Senior Enthusiast

Pryme

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33 minutes ago, Jettech1 said:

Got some info for you.  So today, I tried my best to make the fuel primer pump go off more than once.  I tried everything, rear door first, front door first, tailgate first, locked it again, tried it other ways, key in the ignition, etc etc....Believe me, I tried all combinations that I could.  The pump primed once when I first unlocked it and never did it again.  No matter what I did, I couldn't make it do it twice.  In all honesty, I have no idea why yours likes to do it more than once.  I could speculate about a possible bad check valve in the fuel system, but in all honesty I don't know if there is one.  I can assume there is one in the system, but every time I assume it generally doesn't work out well for me.  If your truck starts up when you want it to, I'm not sure I would worry about it too much.  And the sound you posted from your pump, sounds exactly like mine.  I don't know what else to try to help.  Edit: I was just thinking that most pumps have a built in check valve to maintain the pressure they just built up.  Perhaps you could find a diagram of the fuel pump and see if it has a check valve built into it.  A failed check valve is all I can think of that would make your pump prime more than one time initally.

Thanks Jet.  I do know it won’t even do it if it was started within about 3hrs. It may be because my truck sits sometimes a few days between driving it. I’ve had it since aug and it’s at 2,400 miles now and about half of that is two trips. 
 

I only worry about premature wear. 
what do you think happens if someone opens the door and the pump primes and they don’t end up ever starting the truck? Does the prime just release eventually? 

Jettech1 Senior Enthusiast

Jettech1

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17 minutes ago, Pryme said:

Thanks Jet.  I do know it won’t even do it if it was started within about 3hrs. It may be because my truck sits sometimes a few days between driving it. I’ve had it since aug and it’s at 2,400 miles now and about half of that is two trips. 
 

I only worry about premature wear. 
what do you think happens if someone opens the door and the pump primes and they don’t end up ever starting the truck? Does the prime just release eventually? 

In all honesty, If your truck starts up when you put the key in and turn it to start.  I wouldn't worry about it at all.  By the way I love the simplicity of our trucks.  They need a key to start, they don't have leather (I hate leather)....I love them both!!!

Edited by Jettech1
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Pryme Senior Enthusiast

Pryme

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40 minutes ago, Jettech1 said:

In all honesty, If your truck starts up when you put the key in and turn it to start.  I wouldn't worry about it at all.  By the way I love the simplicity of our trucks.  They need a key to start, they don't have leather (I hate leather)....I love them both!!!

If I could take one thing away I’d take the direct injection out even if it meant a 1-2mpg hit. I just wonder how it will be long term. 

Jettech1 Senior Enthusiast

Jettech1

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3 hours ago, Pryme said:

If I could take one thing away I’d take the direct injection out even if it meant a 1-2mpg hit. I just wonder how it will be long term. 

Keep the DI.  Just install a catch can and all will be fine....DI is super efficient.  The only draw back is that it doesn't keep the intake valves clean....that's where a catch can comes into play... Edit:  Let me share my personal thoughts on this amazing engine for just a second.  Personally, I would have designed it with both port and DI.  Cost is always a factor and the engineers are at the mercy of who can do it cheaper and better.  Well port and DI is the best alternative.  You don't have to worry about oil coking on the intake valves and with DI you get the best combustion burn that will allow the lowest octane fuel to be used.  Best of both worlds.  Trade offs....it's not only in life, but with everything else too.....

 

Edited by Jettech1
  • 4 weeks later...
Jettech1 Senior Enthusiast

Jettech1

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To get back to my original post here's what I've learned...  So a month ago, 1200 miles later.  In a last ditch effort to quiet that damn oil pump noise I threw in a bottle of lube gard.  After reading from many other forums it was touted as the elixir of oil additives that can actually help without clogging up your oil filter with PTFE and other solids.  I did some deep research on bobistheoilguy site as well concerning this additive before I took the leap.  Well.....I can say for a fact it did quiet it down.  Did it go silent?  No.  But it did lessen that awful start up noise from the oil pump big time.  I'm not due for an oil change (I do it every 5k miles) for probably another few months.  So hopefully it just keeps getting better and better.  At first no change, a week later, a little quieter, now 4 weeks later, much quieter.  So perhaps this stuff actually works. I have 5700 on it now, will need an oil change at 7500.  So hey, I'm trying here, but I can say for a fact that it did lessen the noise.  I'm hoping for zero noise in the next 1k miles but will report back as time and miles accumulate.

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