strange noise durring accelerating
Thread Starter
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Elder User
Joined: Jan 2010
Posts: 790
Likes: 3
From: Ontario, OH
if your issue is indeed the same as mine i don't see how the muffler is the problem, but i hope for your sake it does fix it. The only reason i say this is if it were the exhaust, why wouldn't it do it at any speed when your eng. was at the same approx. RPM with the same exhaust airflow. Just my thought process.
New User
Joined: Aug 2011
Posts: 4
Likes: 0
I have a 2012 5.0 XLT and have noticed a similar noise from mine, the first I heard it was the night i drove it away from the lot. Now has about 700 miles on it and is still making the noise, thought maybe it was something to do with break in. Seems to do it at mid speed 45+ mph shifting into passing gear pulling an incline nothing to severe around 2000 rpm. Seems to be from the front of the truck from both sides.
Moderator
Joined: Jul 2011
Posts: 6,508
Likes: 657
From: Sioux Falls Area
i know it's been brought up and dismissed ... but all of these sound like preignition.
anytime someone says "rocks in the engine" or "can full of screws" ... that's pinging.
be aware that the gasoline distributors here in south dakota were about to get sewed by the state for mislabling the pumps. they were selling 85 octane fuel and labling it 87.
just something to take note.
if you got a truck that makes these kinds of sounds, particularly at low rpm and high load, it could be spark knock (pinging), and if it is persistant a high octane fuel should make it stop. if it does, then you need to figure out if you are just getting crappy gas, or if there is something wrong with the truck. it *should* adjust the timing below the preignition threshold, and if it is not doing so, it is either because it cannot retard the timing any further (crappy fuel), or there is something wrong.
my 2010 just did this when i filled up with regular fuel for the first time in about 8000 miles. i usually use e30 or e85, and when i switched to our regular fuel (e10 i presume) the truck did ping for a little bit, until it relearned the timing curve for that fuel.
that's what i'm thinking.....
anytime someone says "rocks in the engine" or "can full of screws" ... that's pinging.
be aware that the gasoline distributors here in south dakota were about to get sewed by the state for mislabling the pumps. they were selling 85 octane fuel and labling it 87.
just something to take note.
if you got a truck that makes these kinds of sounds, particularly at low rpm and high load, it could be spark knock (pinging), and if it is persistant a high octane fuel should make it stop. if it does, then you need to figure out if you are just getting crappy gas, or if there is something wrong with the truck. it *should* adjust the timing below the preignition threshold, and if it is not doing so, it is either because it cannot retard the timing any further (crappy fuel), or there is something wrong.
my 2010 just did this when i filled up with regular fuel for the first time in about 8000 miles. i usually use e30 or e85, and when i switched to our regular fuel (e10 i presume) the truck did ping for a little bit, until it relearned the timing curve for that fuel.
that's what i'm thinking.....
Thread Starter
|
Elder User
Joined: Jan 2010
Posts: 790
Likes: 3
From: Ontario, OH
i know it's been brought up and dismissed ... but all of these sound like preignition.
anytime someone says "rocks in the engine" or "can full of screws" ... that's pinging.
be aware that the gasoline distributors here in south dakota were about to get sewed by the state for mislabling the pumps. they were selling 85 octane fuel and labling it 87.
just something to take note.
if you got a truck that makes these kinds of sounds, particularly at low rpm and high load, it could be spark knock (pinging), and if it is persistant a high octane fuel should make it stop. if it does, then you need to figure out if you are just getting crappy gas, or if there is something wrong with the truck. it *should* adjust the timing below the preignition threshold, and if it is not doing so, it is either because it cannot retard the timing any further (crappy fuel), or there is something wrong.
my 2010 just did this when i filled up with regular fuel for the first time in about 8000 miles. i usually use e30 or e85, and when i switched to our regular fuel (e10 i presume) the truck did ping for a little bit, until it relearned the timing curve for that fuel.
that's what i'm thinking.....
anytime someone says "rocks in the engine" or "can full of screws" ... that's pinging.
be aware that the gasoline distributors here in south dakota were about to get sewed by the state for mislabling the pumps. they were selling 85 octane fuel and labling it 87.
just something to take note.
if you got a truck that makes these kinds of sounds, particularly at low rpm and high load, it could be spark knock (pinging), and if it is persistant a high octane fuel should make it stop. if it does, then you need to figure out if you are just getting crappy gas, or if there is something wrong with the truck. it *should* adjust the timing below the preignition threshold, and if it is not doing so, it is either because it cannot retard the timing any further (crappy fuel), or there is something wrong.
my 2010 just did this when i filled up with regular fuel for the first time in about 8000 miles. i usually use e30 or e85, and when i switched to our regular fuel (e10 i presume) the truck did ping for a little bit, until it relearned the timing curve for that fuel.
that's what i'm thinking.....
Moderator
Joined: Jul 2011
Posts: 6,508
Likes: 657
From: Sioux Falls Area
same idea, slightly different in application though.
for a good read:
Engine Basics: Detonation and Pre-Ignition by Allen W. Cline
keep in mind that these engines have a very high static compression, high enough that in years past they would have required premium fuel. current engine and computer technology allows the computer to adjust the cam and ignition timing to allow the the use of lower octane fuel *87 min*
the only problem with that is that when anything goes wrong, the engine may not be able to adjust the timing fast enough or far enough to keep the engine out of detonation (or pre-ignition).
it's just a theory, but it is not hard to immagine that if they were selling 85octane swill here and labling it as 87, that they could be doing it elsewhere as well.
for a good read:
Engine Basics: Detonation and Pre-Ignition by Allen W. Cline
keep in mind that these engines have a very high static compression, high enough that in years past they would have required premium fuel. current engine and computer technology allows the computer to adjust the cam and ignition timing to allow the the use of lower octane fuel *87 min*
the only problem with that is that when anything goes wrong, the engine may not be able to adjust the timing fast enough or far enough to keep the engine out of detonation (or pre-ignition).
it's just a theory, but it is not hard to immagine that if they were selling 85octane swill here and labling it as 87, that they could be doing it elsewhere as well.
Junior User
Joined: Dec 2006
Posts: 60
Likes: 0
hi
hi guys ive got a 2011 platnium,5.0 motor that was doing what you guys are talking about, my motor would ping and knock going up hills under load hard acceleration and such ,change fuel no luck the funny thing is it would happen so ramdomly so took it to dealer they heard said it said it wasnt normal and to drop it off three days later the rep calls and said it was an intermitantly failing fuel pump. that would explain the randomness of the issue ,changed fuel pump no more issue hope it helps
Junior User
Joined: May 2004
Posts: 92
Likes: 0
i had this problem with 04 it was a iwe actuator for the 4x4 try putting it in 4x4 when it happens if it stops thats a good place to start easy to do cost like $25.00 hopefully its not your iwe's.
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Moderator
Joined: Jul 2011
Posts: 6,508
Likes: 657
From: Sioux Falls Area
vacuum leak causing lean condition causing pinging ...
everyone who said pinging raise thier hand
glad to hear you got it fixed.
and a good lesson to everyone that even new cars can suffer from old-school problems.... i wouldn't have guessed vacuum leak.
everyone who said pinging raise thier hand
glad to hear you got it fixed.
and a good lesson to everyone that even new cars can suffer from old-school problems.... i wouldn't have guessed vacuum leak.
Moderator
Joined: Jul 2011
Posts: 6,508
Likes: 657
From: Sioux Falls Area
win some lose some 
LOL
can't blame a guy for wishfull thinking.
lesson learned still, though. old school problem still exist and problem solving skills still can't be replaced by a code scanner.
LOLcan't blame a guy for wishfull thinking.
lesson learned still, though. old school problem still exist and problem solving skills still can't be replaced by a code scanner.