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Knock Sensors + Marvel Mystery Oil


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#1 Pobd

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Posted 18 June 2012 - 07:33 AM

Hi I'm Ness, I'm from Alabama & I have a 2004 4.8 Chevy Silverado with 138k miles. I was wondering if anyone else uses marvel mystery oil in their trucks? I asked my farther to use Lucas because that's what I prefer. My main question is, if you do use marvel does it set off the check engine light for your knock sensors? 3 times he's used it, 3 times it's gone off, once it cycles out of the engine the light goes off.

thanks, I look forward to gaining knowledge here, I love my truck lol.

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#2 txab

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Posted 18 June 2012 - 08:28 AM

Never heard of it before. Run without it for a while, see what happens. Probably coincidence You don't need fuel additives with every tank of fuel anyway.

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#3 Gurrzt

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Posted 18 June 2012 - 09:55 AM

Marvel oil is basically transmission fluid on steroids, as with transmission fluid, it has tremendous cleansing ability. I used it 15 to 20 years ago in the oil, and in the gasoline, however with the oil refinement now a days (sn vs. sa) with the sulfer removed, and the refinement of gasoline, the marvel oil is basically an outdated dinasor.

Edited by Gurrzt, 18 June 2012 - 09:56 AM.


#4 Pobd

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Posted 18 June 2012 - 10:05 AM

My dad puts it in there, I don't use it ever, if I do put anything it's Lucas products. I know once it's run itself out of the system the check engine light will go off. Just curious if anyone else had this happen.

#5 txab

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Posted 18 June 2012 - 03:03 PM

Have you pulled the code? Maybe it's not knock sensor?

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#6 Pobd

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Posted 19 June 2012 - 06:53 AM

I did, it was 3200 something, they pulled it up in the computer and sure enough knock sensors. I may be wrong about the 3200 I just woke up lol.

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#7 Foghorn14

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Posted 19 June 2012 - 08:12 AM

I've used it in the gasoline and in the oil just before a change. Never a problem. Lot's of people look at it as snake oil, but in my experience in the gas, it makes the truck idle much smoother. Just don't overdo the amount.

Also I had a piece of lawn equipment (bought used) that burned oil. I pulled the plug and poured MMO on top of the piston for a soak. Left it alone for about a week. It dissolved the crud around the rings and no more oil burning.

I don't go crazy with the amount, but a little before an oil change in my opinion helps keep everything clean.

Its been around since 1923, so if it didn't do something, I doubt they would have stayed in business this long.

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#8 randyf

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Posted 19 June 2012 - 08:40 AM

I use it every other tankful or so.....4 oz to 10 gallon of fuel.

Never had any problems with check engine lights.

#9 Pobd

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Posted 19 June 2012 - 06:49 PM

I just don't like that it does that to my truck because my gas mileage really goes down, I was getting 19 mpg & I think he put the whole bottle in my tank

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#10 Foghorn14

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Posted 19 June 2012 - 09:26 PM

I use it every other tankful or so.....4 oz to 10 gallon of fuel.

Never had any problems with check engine lights.


.....I think he put the whole bottle in my tank


4 ounces per 10 gallons is the recommendation from MMO. I could see too much added in causing a sensor to trip.

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#11 unit731

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Posted 20 June 2012 - 05:55 PM

I use both Mystery Oil and Carb/Injector fluid. Not at same time.

My 1992 Mercury Grand Marquis is still running great at 170,000 miles. Never any injector, fuel pump, or fuel tank problems.
I also have this vehicle oil undercoated every year. I reside in heavy winter salt area. No rust so far. No replacement of gas tank, fuel lines etc.
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#12 Twodogs

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Posted 15 January 2013 - 10:17 AM

I'm having the same code going off also on an 05 5.3. Changed the water pump and pressure washed the motor afterwards to clean up the mess. P0420 knock sensor code started going off after that. Seems the 5.3 & the 6.0 are prone to getting carbon build up on the pistons so I did the water injection trick to clean it up. 1/4" clear tube stuck on the PVC valve inlet on top of intake plenum. rev engine to around 2500 rpm and drop the 8' long piece of tubing in a gallon of water (small amounts!!!). Thsi will steam clean the inside of the engine if done correctly and it really seemed to help, it idles so smoothly that you can't even tell it's running.

Anyways, just did this yesterday and will wait and see if the knock sensor code goes away or if I need to replace them because I got them wet washing the engine bay.

#13 Badass69

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Posted 15 January 2013 - 10:38 AM

Knock sensors are also one of the most common problems you can have on the Gen 3's as well. The harness and the sensor itself corrode away because they trap moisture where they are mounted in the valley cover. Pull the intake, change the sensors and the harness plus make a little dam around the sensor hole in the valley cover with RTV and you are good to go.

Most guys say never to pressure wash a Gen 3 specifically because of this..... but whatever. I do everytime I wash my one truck and with over 100000 miles and 8 model years old it's yet to trip a CEL for a knock sensor. They fail regardless and heat and air humidity are your biggest killer.

#14 Chris

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Posted 15 January 2013 - 11:31 AM

I had one go bad on the 4.8. Its an easy fix. All you need is 2 sensors, a harness, and some black rtv

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