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post #11 of 23 (permalink) Old 02-25-2019, 12:16 PM
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You'll likely get a code for a cylinder misfire, which outside which cylinder is the offender (the code will likely be P030x, where "x" = the cylinder that's missing, so 1, 2, or 3), it won't tell you much.

I think you already have a good plan starting out with new plugs. At one time following a small engine fire I had a misfire on two cylinders. It was thought my engine was cooked, but I tried to revive it anyway. The plugs kept getting covered in oil and I was lucky to get two cylinders running on any given day. I went for plugs in a slightly higher heat range and ran some Marvel Mystery Oil. A couple spark plug changes later (they kept getting oil fouled) it eventually just stopped happening and the engine is healthy today.

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post #12 of 23 (permalink) Old 02-25-2019, 03:35 PM
 
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Awesome!!! Thanks for the info and the welcome......

Ill def take your advice on the mystery oil - I have yet to do an oil change on the car - so that's on the To do list too... just need a warm day.....
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post #13 of 23 (permalink) Old 02-26-2019, 04:56 AM
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I have had 3 bad coils lately. After the first one, I replaced all 3, and then one of those went bad, 6 months later a second new one went bad. Engine lost power and when shutting it off and restarting, it ran OK for a bit, then shut down the cylinder again. A new coil did the trick (after replacing spark plugs first) The Denso long life plugs go roughly 100k miles, the standard ones go about 30K miles.

A little Marvel Mystery Oil never hurts!!
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post #14 of 23 (permalink) Old 02-26-2019, 01:36 PM
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Originally Posted by jimvw57 View Post
I have had 3 bad coils lately. After the first one, I replaced all 3, and then one of those went bad, 6 months later a second new one went bad. Engine lost power and when shutting it off and restarting, it ran OK for a bit, then shut down the cylinder again. A new coil did the trick (after replacing spark plugs first) The Denso long life plugs go roughly 100k miles, the standard ones go about 30K miles.

A little Marvel Mystery Oil never hurts!!
Were the coils original smart units or the red ones Smart Madness sells? I was planning to buy a new set from SM, but I will reconsider it if you had trouble with them.
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post #15 of 23 (permalink) Old 02-26-2019, 05:20 PM
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first bad one was a stock coil with 112k miles on it, second one was a SM red coil about 3 days old, last one was a SM red coil with 7 months on it, about 35k miles. Smart Madness did replace the coils extremely fast and they do have a lifetime warranty on them. Price is real reasonable compared to the factory ones.
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post #16 of 23 (permalink) Old 03-08-2019, 05:54 PM
 
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I have a 2009 Smart with 11,000 miles on it. It started misfiring today for the first time on cylinder 1. Engine code P0301. I bought some HEET in the yellow bottle as I thought well I filled up with gas yesterday and maybe it's bad gas, but I feel like if it were bad gas then it'd be less predictable when it's sputtering. It sputters when shifting between 2nd and 3rd and when you're letting off the gas then reapplying the gas, especially at speeds of 45mph or higher.

Not really sure what to replace with such low miles. Spark plugs aren't suppose to be replaced until 30k miles. Hmm.
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post #17 of 23 (permalink) Old 03-08-2019, 06:02 PM
 
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I would administer a double dose of Marvel Mystery Oil to the gas tank and take the car out for a drive on an expressway. If this doesn't work check the coil and if you remove the spark plugs, I would do a compression test.
Smart cars will carbon up on the intake valves if driven on short trips at slow speeds for a protracted period of time.
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post #18 of 23 (permalink) Old 03-12-2019, 03:53 PM
 
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I would administer a double dose of Marvel Mystery Oil to the gas tank and take the car out for a drive on an expressway. If this doesn't work check the coil and if you remove the spark plugs, I would do a compression test.
Smart cars will carbon up on the intake valves if driven on short trips at slow speeds for a protracted period of time.
I guess tomorrow is my time. I have to get my hair cut tomorrow which is a 30 minute commute on I-95. I normally take my sedan, but I'll do the mystery oil. Fingers crossed I don't get stalled out on I-95. My hair really needs a cut.

There seems to be more than one mystery oil product.

There's the MM12R product that comes in 16 ounce or 32 ounce. I suspect a double dose for a Smart car would be the 16 ounce due to the 8-9 gallon gas tank?

Then they have product called Ultimate which comes in a 12 ounce bottle, which is part number 50665.

I guess if this doesn't work, then I could try to swap the cylinder 1coil from my 2008 Passion onto my 2009 Brabus to see if it's a bad coil without having to buy a coil to find out. I don't have the testing tools to figure out if it's bad compression or a bad coil, not sure if AdvanceAuto or Autozone loans those tools.
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post #19 of 23 (permalink) Old 03-12-2019, 04:39 PM
 
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So the MM12R MM13R says to use 4 ounces per 10 gallons of fuel and for oil it says to replace up to 20% of oil with MMO. I guess I'll buy the 32 ounce, add 7 ounces to the fuel and pour the rest into the engine without replacing the oil. It's about a 3.5 quart car, so 22 ounces would be 20%.

Okay, I answered my question. Hopefully being overfilled by 25 ounces of oil won't too detrimental. I really don't feel like dumping oil just to put in MMO.
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post #20 of 23 (permalink) Old 03-13-2019, 11:04 AM
 
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Car is running like new again. I purchased the Marvel Mystery Oil in the 32 ounce size. Put 7 ounces in the gas (full tank) and 25 ounces in the engine. Drove it on I95, it puttered some for the first 5 miles, then cleared right up and drove it an additional 45 miles without any sign of engine troubles. Best $6 I ever spent. Thank you for solving my problem Bob.

I have been driving the car short distances over the past 18 months, rarely ever going further than 4 miles on the highway at any given trip. I also sometimes put in regular unleaded in the car instead of premium when the prices are 60-70 cents higher, maybe that's contributed to the carbon build-up.
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