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Discussion Starter · #1 ·
Guys I need help.

When I got this car I had a warranty so I needed to take the car to them for maintenance and working on it myself was not a option. The original spark plugs that had been in the car where only good for 10000 miles. Bringing my car in the mechanics never checked them at l told me the car is good to drive. I did not think I would need to tell them to take car of that particular thing. 2018 the 2nd spark plug in falls apart goes right through the engine. I take it back to them in tears. They tell me they are not responsible and I will have to pay out of pocket for al repairs despite the warranty that I bought.

So I decided to sell the warranty back do the work myself and take it to my mechanic. Everything has been good till now.

I started loosing power and the engine light came on so I got off the highway and got a tow home since the engine was running pretty rough and I didn't want to take any risks. I did a code reader the next morning showed cylinder #2 was misfiring. So I replaced the spark plug as well as the coil. The engine was running a little smoother but still running rough and the code was still popping up. I decided to call the closest place so that I would not have to drive to far with the engine running poorly.... hindsight I should not have gone to firestone .

So the diagnostic I got from firestone said that cylinder #2 has only 5 psi and they won't touch the engine or even look into it. They are saying I likely need a new engine or the piston has failed and that I should take it to a foreign car specialist. Looking this up it seems that it could simply be a gasket or even a valve. What I am being told by these guys does not add up because the car would not be able to run if it was the piston. The miles on the engine are nearly 150000. I have really struggled with mechanics with this car in particular. I love it and I just am trying to make sure I know as much as I can so I can advocate for myself.

I have already cried and talked to CarMax and expressed the difficulties that I have had with service and asked what my options are and will be taking it to them later on.
 

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The car can run if there is a problem with the piston.

If compression is low in one cylinder it needs to be diagnosed as why. I would look at your previous bill for what was done, then follow this plan for diagnostics.
Do a wet and dry compression test. Dry just means remove the spark plug and put in the compression gauge. Record the result.
The pour about a cap full of oil in the cylinder and repeat the compression reading. If it goes up, the problem is possibly cylinder rings. If it doesn't go up, the problem is either in the valve train or there is physical damage like a hole in the piston. A good shop should have a camera they can insert and look at the cylinder walls and piston before deciding to tear into it.

Based on what you've said my best guess is there is going to be internal engine work needed.
 

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Discussion Starter · #3 ·
Thank you so much. This is the first straight answer that I have gotten about my car. When the initial damage happened I had it looked at and I was told you're really lucky there's no damage in the engine. So this definitely gives me much more to go on.
 

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1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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A borescope can look inside the #2 cylinder and check for mechanical damage through the spark plug hole. P0302 would be the #2 cylinder misfire code.


Borescope Inspection Camera For Automotive Engines


The Fiat 1.4L is the same one used in the Dart. Valve adjusters can pump up and hold the valve(s) open. This could cause the low compression and misfire in #2.
You didn't mention what year yours is, but there are TSBs that addresses a "cranks fast, as if no compression" concern as well as a STAR bulletin addressing cracked camshaft lobes. See attached:
 

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