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Discussion Starter #1
So I'm getting a misfire at start up. Car drives fine other than that. P0300

Little back ground information on this car. Had a random misfire that they said was the cam cover so they replaced it. Less than a week later it was back to misfiring on start up. Took it back in and after several days they decided it was the coil pack so they replaced it. Drove it a week or so and back to the same thing. 9 days later they concluded it was a ECM update. Well a week later back to the same issue. Now they want me to pay $217 for injector cleaning and maybe that's the problem.


All help is welcomed.
 

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If you are not running a Top Tier Gasoline then you should be.

Relevant questions that you also need to respond to:

Model Year?

Engine?

Transmission?

Odometer?

Spark Plugs and Gap?
 

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Been dumping a can of Seafoam in all of my vehicals in a full tank of gas every 5,000 miles. PCV is the culprit with fuel injectors sure leaves a mess on the surfaces affecting the fuel spray. Also a chain reaction, carbon builds up on the piston ring, even more blowby, carbon is already a 125 year old problem.

Nothing mentioned about the spark plugs, still clean them every 15K and replace them every 45 K miles with a walnut shell blaster. Again highly conductive carbon building up on that center electrode ceramic insulator, providing a direct short to ground.

Really no definitions on what top tier gas is, only use this stuff, but still has carbon in it, carbon is the problem.
 

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Run your current tank down to the Low fuel light. Then get a bottle of Techron Fuel System cleaner and go to your nearest Shell station. Pour in the fuel system cleaner in and then top off the tank with the Shell vPower Premium. On the 2011 - 2016 LTD ECO MT this means you'll want to fill past the artificial shutoff. You want the fuel to be visible a couple of inches down in the fill pipe when you're done. The fuel system cleaner will mix with the gasoline in the tank. Drive the car until it's "empty" again and then refill with the Shell vPower premium to your normal first click fill point.

This procedure does 80% of what the injector cleaner service at the dealership will do and do it for less than the dealership, just the cost of the cleaner and the incremental cost of Shell's top of the line detergent package.
 

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Really no definitions on what top tier gas is, only use this stuff, but still has carbon in it, carbon is the problem.
All gas has carbon. Gasoline is a distillation of crude oil, which is a complex hydro-carbon.

The Top Tier program has specific requirements that must be met, but it really boils down to additives that prevent carbon build up and clean underground tanks and distribution channels.
 
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