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  #1  
Old 08-30-2003, 04:54 PM
Mean318 Mean318 is offline
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Default Marvel Mystery Oil Dilema!

My grandfather poured 1/3 of a bottle of Marvel Mystery Oil in my gas tank and now my engine is running (barely) like caca! I've filled the tank up completely to try to dillute it, but it's still idling poor, exhaust is loud, and I'm getting a lot of back pressure. Throttle response is about half of what it was and the thing almost wants to stall! What the hell do I do!?
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  #2  
Old 08-30-2003, 05:05 PM
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First off, dont put that crap in your car. There is no such thing as a mechanic in a bottle. That stuff never works. Just like there no such thing that stops wrinkles that women pay tons of cash on each year. Dont know why the feds dont pull this junk off the market along with the false advertising. They did it to those companys selling the electric shock belts that claimed to make you loose weight so why not do it to these shisters too.

Pull the tank and drain it. Pull the filter and change it. Run the engine till it dies with no fuel in it if it's no an FI car.Make sure the lines are cleaned out too. Replace everything and refill the tank. Should get you going again. Just what did you expect to accomplish by pouring a type of oil in the tank anyways?
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  #3  
Old 08-30-2003, 05:22 PM
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pishta pishta is offline
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Could that MMO have softened up a bunch of SH(T ad sent it into your fuel filter and/or carb? It also could have dislodged a big chunk of carbon and is blocking a valve from closing. Trouble with that type of stuff is it works too good and gets alot of stuff off the combustion chamber and sends it out the tail pipe (hopefully) MAy want to try the water in the carb trick that so many people swear by on the forum to blow some of the muck out.
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Old 08-30-2003, 05:31 PM
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Grandad must have thought that this was a 2 stroke engine... LOL

many people believe that if you run some ATF or MMO through the fuel system, it will help to remove carbon faouling and help with top end lubrication, since there is no longer lead in the gas.

There are people on this board that will ad about 2oz of MMO for a 20 gallon fill up. Grandaddy put way to much in.

You can either drive it out of the system (she will run rough the entire time and blow lots of nasty smoke) or drain the fuel system out and fill up with gas ONLY. It should take less than 10 minutes of engine run time to purge the rest fo the crap out of the carb.

Don't forget, you have to find some way to safely dispose of the contaminated gas, if you drain the tank. Maybe keep it around for you old 2 stroke weed whacker or an old 2 stroke dirt bike.
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  #5  
Old 08-30-2003, 05:37 PM
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Quote:
Originally posted by pishta
Could that MMO have softened up a bunch of SH(T ad sent it into your fuel filter and/or carb? It also could have dislodged a big chunk of carbon and is blocking a valve from closing. Trouble with that type of stuff is it works too good and gets alot of stuff off the combustion chamber and sends it out the tail pipe (hopefully) MAy want to try the water in the carb trick that so many people swear by on the forum to blow some of the muck out.
I wouldn't try to do anything else, until the MMO is completely purged out of the system. Once the MMO is gone, then you can determine what is left and what needs to be done. Until then, you can't be sure that it isn't the MMO itself that's causing all of the problems.
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  #6  
Old 08-30-2003, 10:24 PM
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i've changed the fuel filter and cleaned the carb and it's still running like dung. i'm gonna keep topping it off and see if it eventually dillutes down and fixes itsself. i hope nothing has lodged in the fuel line or carb! i hate to drain and discard the fuel (40 gallon tank) with gas prices these days!
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  #7  
Old 08-30-2003, 10:53 PM
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It'll take for ever to get the MMO out of the system, if you keep topping it off. Try to hold off until you are down to the area of 1/4 tank or less, if you possibly can.
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Old 08-31-2003, 01:18 PM
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hello, question!! did you pull the spark plugs yet? If you cleaned the fuel system and it still runs bad, only thing left is plugs. I have found that MMO is good to pour down the carb on a motor that will set for awhile. prevents rusting and no dry starts. good luck,
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Old 08-31-2003, 02:07 PM
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no, i haven't checked the plugs yet. maybe one (or more) has fouled? i'll do that today!!!
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  #10  
Old 08-31-2003, 02:50 PM
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Default Re: Marvel Mystery Oil Dilema!

The MM won't hurt anything. However, with the amount added, it will lower your octane rating, so stay out of the throttle for a while. Run your tank down as low as you can and then fill it.

Mitch

My grandfather poured 1/3 of a bottle of Marvel Mystery Oil in my gas tank and now my engine is running (barely) like caca! I've filled the tank up completely to try to dillute it, but it's still idling poor, exhaust is loud, and I'm getting a lot of back pressure. Throttle response is about half of what it was and the thing almost wants to stall! What the hell do I do!?
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  #11  
Old 08-31-2003, 05:21 PM
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changed the plugs...still running poopy. i'm going to my friend's to get a section of garden hose and i'm just gonna suck all the fuel outa the tank. don't EVER put this crap in your engine! grandpa, i love you and all, but you're an ASS!
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  #12  
Old 09-01-2003, 01:07 AM
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ok, i emptied the tank. filled it up with "clean" fuel and it seems to be doing a little better, still crappy though. we'll see in a couple days if it starts to clear up any...
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  #13  
Old 09-01-2003, 11:59 AM
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You may need to replace the filters and blow the lines out again too.
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  #14  
Old 09-01-2003, 01:58 PM
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what is left in the filter and lines should run through the system within 5 miles of driving.
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  #15  
Old 09-01-2003, 02:05 PM
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i'm gonna get her out on the road and open it up. i'll let you know if it clears thanx ehostler
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  #16  
Old 09-01-2003, 02:19 PM
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I'm not endorsing the Marvel product in any way, but I've used it a bunch of times and never had the different vehicles react like that. Possibly something else happened at same time you put in the marvel stuff?
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  #17  
Old 09-01-2003, 02:24 PM
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I'm beginning to think that too. It goes in the shop this week to have some mods done so I'll have my mechanic check it out if it hasn't cleared up by then.
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  #18  
Old 09-01-2003, 03:09 PM
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Might try some octane booster or 10 gals race gas to help with the left over MMO in the system
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  #19  
Old 09-01-2003, 03:33 PM
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Like moparmotorman I question where the blame is laid. Unless the (1/3 of) container was a 5 gallon pail the mmo should do nothing but elevate combustion chamber temp a small amount. If your ride has a cat converter don't use any leaded racing fuel, it will cause more problems.
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  #20  
Old 09-03-2003, 07:03 PM
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i doubt it caused the problems, i have used it for years.
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  #21  
Old 09-04-2003, 01:29 AM
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Here's a subject that I have personal experience with...

If that engine reacted that harshly to MMO it was on its last leg already. I doubt if that's the case so it has to be coincidence...

I have been around, used, been required to use MMO for about 30 years and in probly 5 or 6 hundred engines and never had any kind of reaction like the one discribed.

Unless like previously mentioned it was a 5 gallon can. I won't say I swear by it. But I doubt it does any harm either.

I have ran it in the early GM diesels (you know, the crappy 5.7 Olds conversions) and have gotten 300,000 miles on 4 different pickups. when we went to the 6.2 we got 500,000 miles on 2 other pickups.

I'm not saying the MMO helped, but if it hurt anything, it sure took a long time doing it....
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  #22  
Old 09-04-2003, 11:07 AM
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ok... i dunno what the car/truck is, or what year... but i saw something everyone else seemed to miss... and that was about back pressure... (there are so many posts i cant see the original post while i am replying)... but only one thing causes back pressure... EXHAUST RESTRICTION!!! i dunno what MMO does to catalytic convertors, but lots of older additives arent very friendly to them, and MMO has been around for a couple of days. soooo... my suggestion would be to piss the neighbors off and disconnect the exhaust in front of the catalytic convertor and see what it runs like. if it runs better, then your problem (or some of it anyway) lies between where you disconnected the pipe and the tail pipe, most likely in the cat or muffler.
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  #23  
Old 09-04-2003, 12:16 PM
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We may have to put out a hit on your grandfather, LOL
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  #24  
Old 09-04-2003, 01:20 PM
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ha! I HEAR YA! yea, my "pa" is an old kentucky boy that used to grow his own tobacco and sell shine outa the back of his truck back in the day. i think i scolded him a good one cuz i haven't heard from him since! anyway, if this was a timing issue, how could my engine all of a sudden get so out of whack for no apparent reason? i tweaked the distributor a bit and it seemed to clear right up, aside from the exhaust still being a little on the throaty side when i rev it. i've gone thru 20 gallons since i drained the tank so most of it should have passed thru by now. like i said, it goes to my mechanic next week and i'll have him and his machine check the entire thing out & give me their expert opinion.
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  #25  
Old 09-04-2003, 01:22 PM
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aren't you supposed to run MMO if you use jet fuel in the vehicle?
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  #26  
Old 09-04-2003, 01:54 PM
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MMO = "snake-oil" !!!! ............
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  #27  
Old 09-04-2003, 02:08 PM
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yea MF, "step right up folks..."
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  #28  
Old 09-04-2003, 02:33 PM
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LOL.......wasn't there a info-mercial last night about MMO ??? - at the end of one of those TV preachers PLEA for $$$$ ... !!!
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  #29  
Old 09-04-2003, 02:36 PM
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I'll tell you what! I used that stuff in an old tractor that had been sitting for years, and sure enough after about 5 hours of run time that sucker quit smokin'. Although I don't think I would put it in any of my new vehicles.
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Old 09-04-2003, 04:11 PM
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you would need something more than MMO if you were running jet fuel... all that is is kerosine with a few other additives... maybe MMO is one of them... lol
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