Just Past 100K and Have an Issue

[rescuerandy2]

Just as Extended Warranty ended, I am now having what sounds like knocking only above 60mph(am using 89 Octane). From 60-75, under mid to hard acceleration, I hear what sound like a cross between engine knock and a fan out of balance. The noise becomes constant above 70-75 and when you take your foot off the gass, it takes 5-7 secondes to quiet down. This goes on with and without AC. Noise sound like it is from right side of dash or right side of engine compartpment. Thanks, Randy (2004 MM with 102,000miles).

[RacerX]

Have you been using 89 octane in it the whole time you've had it? I'm suprised if you have that it hasn't done this before. If you have been driving this entire time with 89: It's possible you have a vacuum leak and that's just enough to lean it out to cause this. MAF may need to be cleaned and is leaning out the mixture a bit.

[nh muscle]

Owners manual ?? Recommended fuel suggestins?

[Mebot]

I just have to point out how fitting your user name is right now. I hope you get your knock fixed!

Sent from my handheld Zack Morris iShoe 4S.

[rescuerandy2]

81,000 mile with 89 Octane and 19mpg to this day. Will check for vaccuum leaks and will look at MAF. Got that name 35 years ago in the Volunteer Fire Service and now looking for someone to rescue me and the MM. Randy

[ctrlraven]

Do you have an aftermarket tune to be using 89 octane? The minimal octane per Ford is 91 octane for the MM.

[SC Cheesehead]

Do you have an aftermarket tune to be using 89 octane? The minimal octane per Ford is 91 octane for the MM.

That's the same thing I was thinking...

[Motorhead350]

89 octane? Being cheap and your gas mileage went down. Now you have an issue simply because of disobaying the owners manual.

So much fail.

[rescuerandy2]

MPG was 19mpg at 21K with 89 and 91 Octane. Many members on this site, 3 years ago, said they did just fine with 89. I am still at 19mpg with this issue and having a blast on the Florida Turnpike every morning to work. Randy

[SC Cheesehead]

MPG was 19mpg at 21K with 89 and 91 Octane. Many members on this site, 3 years ago, said they did just fine with 89. I am still at 19mpg with this issue and having a blast on the Florida Turnpike every morning to work. Randy

I take it you don't run the car much under hard acceleration....:cool4:

BTW, octane doesn't determine fuel mileage, it reduces the potential for pre-detonation (i.e. knock) in high compression engines under load.

4V Marauder engines + pre-detonation = BOOM!

That's real easy to do with 89 octane gas unless you get the engine de-tuned by retarding the spark.

[nh muscle]

One owner is running. FRUIT PUNCH and has been for YEARS !!!

[SC Cheesehead]

One owner is running. FRUIT PUNCH and has been for YEARS !!!

Fruit Punch is running 89 octane fuel?

[RacerX]

89 octane? Being cheap and your gas mileage went down. Now you have an issue simply because of disobaying the owners manual.

So much fail.
You hush up!!! DieselBoi!!! :D

Like I said above. If he's been running it without a prob for 20k, there's something else bringing it out as a problem. Still isn't wise, but, moot at this juncture.

[nh muscle]

No it says he is putting. Fruit punch in the tank. Sorry I should try to "keep it simple"

[SC Cheesehead]

No it says he is putting. Fruit punch in the tank. Sorry I should try to "keep it simple"


Gotcha! ;)

[UncleLar]

If he's got 100K miles he's also probably got a lot of carbon build up.Between that and 89 octane he could very well be suffering from detonation.
As far as mpg difference between 89 and 91/93 the knock sensors probably retarded the spark enough before to keep it from detonating but with retarded spark you aren't going to get maximum performance or gas mileage.

[Baaad GN]

One thing I learn from my father who was the Senior chemist for Sinclair Oil company, taught at IIT chicago and ended up running the experiment Labs for UOP was not all gas is the same, somes companies pick up what ever is being sold on the market, other companies don't. 90% of the low oct gas do not have cleaning agents in them so your engine will carbon up! So ya save 3-6 cents a gal in a car not designed for it and don't expect trouble??????? You asking for it. Let me show you my age, the old time guy's will remember this. back in the 50's-60's it was hard getting good gas if ya could it was Sunoco 260 but that was big bucks, I bet at least .35 cents a gal. We cleaned the carbon out of engines by reving the engines up and pour water down the Carb. Just enought so it would not stall. ShXX would fly out the exhast like you would believe, no cats back then otherwise you'd plug them up but it did play hell on the mufflers. Think I better quit now.

[UncleLar]

One thing I learn from my father who was the Senior chemist for Sinclair Oil company, taught at IIT chicago and ended up running the experiment Labs for UOP was not all gas is the same, somes companies pick up what ever is being sold on the market, other companies don't. 90% of the low oct gas do not have cleaning agents in them so your engine will carbon up! So ya save 3-6 cents a gal in a car not designed for it and don't expect trouble??????? You asking for it. Let me show you my age, the old time guy's will remember this. back in the 50's-60's it was hard getting good gas if ya could it was Sunoco 260 but that was big bucks, I bet at least .35 cents a gal. We cleaned the carbon out of engines by reving the engines up and pour water down the Carb. Just enought so it would not stall. ShXX would fly out the exhast like you would believe, no cats back then otherwise you'd plug them up but it did play hell on the mufflers. Think I better quit now.
Yep,you took a Coke or Pepsi bottle,filled it with water,put your thumb on the top of the bottle and let a very slight stream of water drip into the carb as you revved it to keep it running.
Or you can find 20 miles or more of road with no cops around and do an Italian Tune Up,somewhere between 100-150 mph for 20 miles or so should blow it out pretty good.
If you're not sure how to do the Italian Tune Up just follow Motorhead 350 for a while and try to keep up.

[SC Cheesehead]

One thing I learn from my father who was the Senior chemist for Sinclair Oil company, taught at IIT chicago and ended up running the experiment Labs for UOP was not all gas is the same, somes companies pick up what ever is being sold on the market, other companies don't. 90% of the low oct gas do not have cleaning agents in them so your engine will carbon up! So ya save 3-6 cents a gal in a car not designed for it and don't expect trouble??????? You asking for it. Let me show you my age, the old time guy's will remember this. back in the 50's-60's it was hard getting good gas if ya could it was Sunoco 260 but that was big bucks, I bet at least .35 cents a gal. We cleaned the carbon out of engines by reving the engines up and pour water down the Carb. Just enought so it would not stall. ShXX would fly out the exhast like you would believe, no cats back then otherwise you'd plug them up but it did play hell on the mufflers. Think I better quit now.


Yep,you took a Coke or Pepsi bottle,filled it with water,put your thumb on the top of the bottle and let a very slight stream of water drip into the carb as you revved it to keep it running.
Or you can find 20 miles or more of road with no cops around and do an Italian Tune Up,somewhere between 100-150 mph for 20 miles or so should blow it out pretty good.
If you're not sure how to do the Italian Tune Up just follow Motorhead 350 for a while and try to keep up.


Ah, for the good old days.

Hey, anybody got a match book, gotta gap my points...;)------->:D

[Marauderjack]

This guy is askin' for help and y'all converted the thread to a gasoline discussion!!!:shake:

The '04 Marauder with a "stock" tune should run any octane since the knock sensors alert the PCM to pull timing if detonation occurs!!:beer:

If he is getting this noise at higher speeds and it takes 5-7 seconds to stop AFTER he gets off the gas I doubt it is spark knock!!:confused:

Let's try and come up with some helpful information here....OK??;)

DAMN....I sound like a MODERATOR....WOAH NELLIE!!:eek:

[JimmyXR7]

This guy is askin' for help and y'all converted the thread to a gasoline discussion!!!:shake:

The '04 Marauder with a "stock" tune should run any octane since the knock sensors alert the PCM to pull timing if detonation occurs!!:beer:
If he is getting this noise at higher speeds and it takes 5-7 seconds to stop AFTER he gets off the gas I doubt it is spark knock!!:confused:

Let's try and come up with some helpful information here....OK??;)

DAMN....I sound like a MODERATOR....WOAH NELLIE!!:eek:

I thought they were giving him good advise but did not say it. Running cheap gas will gum up the engine internals.
Possible solution - Run a tank (or 2) of Chevron high octane with the Techron cleaners. Or add the gas cleaning additive today.
Do not drive at the speeds the engine makes the noises until the cleaners have had a chance to work.
Jim
PS Also check out the problems with the 2007-08 F150 and navigators with dirty engines and spark plug removals.

[Marauderjack]

Sounds like more than a dirty engine to me.....possibly trans related unless there is so much carbon in the cylinders high speed thermal expansion is causing piston tops to hit the plugs??:confused:

If that were the case CR would be 15:1.....not likely!!:shake:

[rescuerandy2]

Gentlemen, I am gettin about 1-2 seconds of the same sound on a cold start. I am also wondering, since the noise I am hearing sounds like a valve fluttering, if it may not be in the EGR system. This would be on the same side and location that I am hearing this sound. Thanks, Randy

[CBT]

I take it you don't run the car much under hard acceleration....:cool4:


.....said no one to CBT, ever.

[efi4eye]

Might not be a bad idea to run some Seafoam through the engine with 100K on it. It does a pretty good job of removing deposits. Just an idea, but why not try running the actual recommended fuel - 91 or even 93- just to see if the problem clears up?

[Curless]

First and foremost, if the car calls for premium, you buy premium...nuff said. I don't want to get into a discussion of what anyone's brother's cousin's milkman does with their car, it needs 91 octane for a reason the knock sensors have a window of adjustment based on the engine consuming 91 octane not 89...PERIOD.

That being said, if the noise is continuous (not going away after you let off of the throttle or only under load) something is wrong. You can try to use a BG product or SEAFOAM through it these will not hurt anything. The optimum would be to pull the plugs out and use a bore scope to look at the chambers. You'll know if there is a real issue or not. DO NOT KEEP DRIVING IT until someone looks at it...there is no such thing as "Jesus in a jug" or "mechanic in a can".

[Marauderjack]

First and foremost, if the car calls for premium, you buy premium...nuff said. I don't want to get into a discussion of what anyone's brother's cousin's milkman does with their car, it needs 91 octane for a reason the knock sensors have a window of adjustment based on the engine consuming 91 octane not 89...PERIOD.

That being said, if the noise is continuous (not going away after you let off of the throttle or only under load) something is wrong. You can try to use a BG product or SEAFOAM through it these will not hurt anything. The optimum would be to pull the plugs out and use a bore scope to look at the chambers. You'll know if there is a real issue or not. DO NOT KEEP DRIVING IT until someone looks at it...there is no such thing as "Jesus in a jug" or "mechanic in a can".

I'd pay attention to this ^^^ and do what Chris says!!:beer:

Also, if you have a BUNCH of carbon Seafoam could knock enough stuff loose to plug up your cats if they're not already plugged!!:(

[UncleLar]

I run a big bottle of Chevron Techron in the fuel tank every oil change every 3 months or 3K miles,whichever comes first and then a can of SeaFoam in between oil changes.

[Baaad GN]

OPPPSSS guess I better not add anything here as I might divert the theme, sorry, bye!!!!!!!

[rescuerandy2]

Ran the tank down to empty and filled with 91 Octane with no change in the noises. Heading to the shop 0700 tomorrow. Thanks for the suggestions. Randy

[UncleLar]

Please let us know what the problem is/was.
I hate it when somebody comes on asking for help to some difficult to diagnose issue and then fixes or gets it fixed and never lets us know just what was wrong and what it took to solve the issue.
BTW,I loved reading about hard to diagnose problems in Gus's Garage in Mechanics Illustrated when I was a kid,I learned a lot about trouble shooting there.
I'll bet a bunch of other "experienced" guys did too.

[mrjones]

The minimum octane rating for our cars has been discussed here much over the years. I have a tune on my car and always use 93 octane in it. However, looking back at the owner's manual, it states that failing to use at least 91 octane "may degrade performance". I would think that if using lower octane gas would result in engine damage, the owner's manual would specifically state that it would, and also warn of voiding the warranty for the engine if damage were to occur as a result of the the lower octane fuel.

Am I way off base here?

[CBT]

The minimum octane rating for our cars has been discussed here much over the years. I have a tune on my car and always use 93 octane in it. However, looking back at the owner's manual, it states that failing to use at least 91 octane "may degrade performance". I would think that if using lower octane gas would result in engine damage, the owner's manual would specifically state that it would, and also warn of voiding the warranty for the engine if damage were to occur as a result of the the lower octane fuel.

Am I way off base here?

Makes sense to me. But if I remember correctly, the gas cap says "premium fuel only", is 91 octane considered premium? I'm not even close to being an expert on fuel ratings. Or milage, lol.

[guspech750]

Makes sense to me. But if I remember correctly, the gas cap says "premium fuel only", is 91 octane considered premium? I'm not even close to being an expert on fuel ratings. Or milage, lol.

I'm going to say 91 is premium. In some states that is the highest octane rating.


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom

[CBT]

I'm going to say 91 is premium. In some states that is the highest octane rating.


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom

That's un-'Merican! Should be 103 octane in all 57 states!

[guspech750]

That's un-'Merican! Should be 103 octane in all 57 states!

57 states, Does that include Cuba and China?


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom

[CBT]

57 states, Does that include Cuba and China?


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom

Dunno, let me ask...

Obama Claims He's Visited 57 States - YouTube (http://www.google.com/url?q=http://www.youtube.com/watch%3Fv%3DEpGH02DtIws&sa=U&ei=7T4uUbipItC30QHWpoCwBg&ved=0CBkQtwIwAA&usg=AFQjCNGeyaw--Q7g2PDgNB5HgGZeq_naoA)

[fastblackmerc]

That's un-'Merican! Should be 103 octane in all 57 states!


57 states, Does that include Cuba and China?


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom


Dunno, let me ask...

Obama Claims He's Visited 57 States - YouTube (http://www.google.com/url?q=http://www.youtube.com/watch%3Fv%3DEpGH02DtIws&sa=U&ei=7T4uUbipItC30QHWpoCwBg&ved=0CBkQtwIwAA&usg=AFQjCNGeyaw--Q7g2PDgNB5HgGZeq_naoA)
So another thread gets trashed... :shake::shake::shake::shake:

[fastblackmerc]

Dunno, let me ask...

Obama Claims He's Visited 57 States - YouTube (http://www.google.com/url?q=http://www.youtube.com/watch%3Fv%3DEpGH02DtIws&sa=U&ei=7T4uUbipItC30QHWpoCwBg&ved=0CBkQtwIwAA&usg=AFQjCNGeyaw--Q7g2PDgNB5HgGZeq_naoA)

OK...let me find Republican mistakes......

[tbone]

Makes sense to me. But if I remember correctly, the gas cap says "premium fuel only", is 91 octane considered premium? I'm not even close to being an expert on fuel ratings. Or milage, lol.


It also says it under the gas gauge.

[RacerX]

Could be a dropped valve seat too. Have the shop do a compression check on all cylinders.

[rescuerandy2]

Took the MM to the dealer and it needs a rearend. All the noises were coming from a bad rear end. Will let you know how it sounds from Florida's Turnpike this Saturday. Randy

[guspech750]

Took the MM to the dealer and it needs a rearend. All the noises were coming from a bad rear end. Will let you know how it sounds from Florida's Turnpike this Saturday. Randy

Well that really sucks.


Sent from my iPhone 4S

DTR + 4.10's + Eaton swap = Wreeeeeeeeeeeeeeedom

[CBT]

Took the MM to the dealer and it needs a rearend. All the noises were coming from a bad rear end. Will let you know how it sounds from Florida's Turnpike this Saturday. Randy

2,500 bucks?! What is that for parts labor and everything at the dealer?

[Comin' in Hot]

If you get it done at the dealer, that sounds about right. I just had my trilogy's done under warranty, and the bill was 26XX.00 before the warranty claim.

I'm in the process of redoing the rear in my DBP and I have like 1100.00 in parts, best of everything. Ford 31 spline axles, Cobra diff, FRP 4.56 gears, FRP diff cover, and tons of other parts. I am only reusing the housing and the bearing caps.

Add a max of $500 for the assembly and I'm going to have a bullet proof rear for about $1000 less than the dealer would rebuild a stock one.

[Marauderjack]

It was the 89 octane gas......I'm positive!!:rolleyes:

[JimmyXR7]

It was the 89 octane gas......I'm positive!!:rolleyes:
He could not tell if the noise was comming from the front of the car or the back?
He needed a buddy in the car.
After I pinned a noise to the back I had my wife in the car to also listen and we determined the right rear axle was the area making the noise.
$660 for two new axles this year at 25,000 miles in Marauder #2.
Jim