Piston knock sound=Carbon Buildup? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 08-12-2005
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Piston knock sound=Carbon Buildup?

Ive got this soft knock sound when my truck runs and i swore it was a thrown rod or something but i looked on an all data computer on my truck and it said that this could be carbon buildup in the combustion chamber(is this the cylinder?). Could this be true, and if so what should i do to fix it?
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  #2  
Old 08-13-2005
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You could try running a couple cans of fuel injector cleaner with techron through it...
It could be alot of different things.

Rand
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  #3  
Old 08-13-2005
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i heard the best thing to clean carbon build up is GM Top Engine cleaner

u pour it into any vaccuum of the engine, and it'll clean it out brand new

theres also a pour in product called XPR that will do the same thing, u just pour it in the gas tank and it'll eat all the carbon away...

i havent tried either yet, as i cant find any, but i'l do it asap, this is a problem i have as well...
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Old 08-13-2005
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ya the only thing ive tried is sea foam in the gas tank but it didnt work.
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Old 08-13-2005
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yah, just try either of those products if u can get a hold of them

most people are leery of "mechanic in a bottle" type deals, but they do work...but there are also a lot of fakes out there....

www.xpr.com i think is the website...its legit...
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Old 08-13-2005
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So many of those 'pour in the gas tank' solutions are BS, I really am leary about which ones actually do any good. I mean, how usefull can a product be when you have 8 ounces in a 20 gallon tank.
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  #7  
Old 08-13-2005
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mix a few shots of tequila in a glass of water....

can ya still get tipsy? yah...

well, i guess


like i said, the direct pour in of the GM cleaner is the best by far, but i have no idea where to get it
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Old 08-13-2005
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Quote:
Originally Posted by TippnOver
mix a few shots of tequila in a glass of water....

can ya still get tipsy? yah...
Among other things... But the proportions I think a little bigger in that case.
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  #9  
Old 08-13-2005
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true

but i'm just tryin to say that true, the amount is small, but its potent...
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  #10  
Old 08-13-2005
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I heard spraying seafoam into the tb was a good cleanout technique.
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  #11  
Old 08-13-2005
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HIJACKING IN PROGRESS

i think my valves are rattling...will a top engine cleaner or carbon remover take care of this?

kinda sounds like marbles are in the engine when its parked or idle...
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  #12  
Old 08-13-2005
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thats the same noise mine makes
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  #13  
Old 08-13-2005
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yup and we got the same engine

i guess it is the valves sticking...i'll get on a solution asap
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  #14  
Old 08-13-2005
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Quote:
Originally Posted by TippnOver
HIJACKING IN PROGRESS

i think my valves are rattling...will a top engine cleaner or carbon remover take care of this?

kinda sounds like marbles are in the engine when its parked or idle...
A TEC will not likely get rid of a valve rattle unless there is that much carbon in the cylinders and valves. It that is the case then it will affect the running of your vehicle. Have you tried a GM dealer for the engine cleaner? I know in california among a few other states they will only sell a 24mL bottle and not to the general public. It is pretty expensive from the dealer as well, last I can remember was upwards of $16 a can. When and if you do this take the liquid in very slow so you dont hydrolock the engine, that would be not in your best interest.
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  #15  
Old 08-14-2005
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true, and then change the oil asap...it'll royallly f things up if iti got inside the enigne
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  #16  
Old 08-15-2005
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"TippnOver yup and we got the same engine

i guess it is the valves sticking...i'll get on a solution asap"

alright well let me know when you find the problem
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Old 08-16-2005
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My friend's real big with his Honda and on forums all the time. They said to use Sea Foam, as mentioned in this thread. His accord has about 260,000 miles and he put 1/3 bottle in the TB, it smoked white for a good 20min running at idle. He said it runs alot better, smoother, more power, and he knows what he's talking about. I put the same amount in my 4.0 and a tid bit of white smoke came out for a few seconds, i have only 38,000 miles so it probably didn't do too much, haven't driven too far from where I did it so I couldn't see if it changed anything on mine.
It's good for putting in gas, oil, pretty much everything, as read on the bottle.
Available at i guess any auto parts store for around $5
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Old 09-15-2006
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score, i have 2 probs. the valves clicking and another sound.. that marble sound

i could never explian how it sounded! haha so that makes 3 of us...

as for the GM stuff, i know someone at a chevy dealership, i may try getting some of that.. i have also heard from wayne, just a fine mist of water at about 3000 rpms..
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  #19  
Old 12-15-2006
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OLD THREAD: Did anybody ever find a fix for this?
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  #20  
Old 12-15-2006
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Quote:
Originally Posted by vansnxtweek
OLD THREAD: Did anybody ever find a fix for this?
Keep in mind the "marbling" sound that some '98-'00 4.0L OHVs are prone to. Apparantly in '98 the pistons were redesigned in order to reduce the engine's overall recipricating mass and hence improve NVH. Unfortunately, this change also resulted in the piston being able to move around in the bore which can sound like marbles rattling around in a can. For whatever reason, the noise seems to be most noticeable right after an oil change. From all accounts (thus far), the condition does not pose any threat to engine performance or longevity. Here's what Ford has to say about it:

Quote:
15226 - 4.0 OHV MARBLE NOISE

Some 1998-2000 Ranger/Explorer equipped with a 4.0L OHV engine may exhibit an engine noise that may be perceived by the customer as a "Diesel" type noise and is known as Marble Noise. Marble Noise is clearly heard when the vehicle is at idle, under 2000 RPM or under very light/no load. High mileage studies of the condition show no adverse effect to engine life or performance. Cleaning carbon from the combustion chamber will have no effect on the Marble Noise condition. Marble Noise is a characteristic noise of this engine and cannot be serviced with an engine exchange.
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  #21  
Old 12-16-2006
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10-4
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  #22  
Old 12-16-2006
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I thought I tossed a rod as well. Sea-Foam used in the vaccume fixed it. The noise is still there, but youhave to listen in order to hear it. Before hand, it made the flopping noise a loose/broken rod or a spun rod-berring would make.
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  #23  
Old 12-16-2006
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Alright thanks for the help..makes me feel a lot better......i was startin to think it was a diesel with no turbo or something...hahaha.
Thanks!
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  #24  
Old 12-17-2006
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although I have a 4 cyl, I poured maybe a 1/4 of seafoam through the brake boaster line, waited the 5 mins to start it up, and it really didn't smoke much at all, just very lightly and you couldn't hardly notice it.......it smoked more when you reved it but only for like 10 secs.......its got 140k miles on it so I figured it would do more.
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  #25  
Old 12-17-2006
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^^Did it help out any?
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