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Lean running cylinder
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Thread: Lean running cylinder

  1. #1
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    Lean running cylinder

    It appears that cylinder 1 is running lean and hot, no check engine light no power loss only a slight reduction in mpg. 56000 miles, what could I be looking at realistically? Are injectors a common issue?

  2. #2
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    Maybe pull the plugs and check? If they all look normal maybe the brick is malfunctioning. What makes you suspect #1?

  3. #3
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    Replaced the plugs and coils due to a cylinder 1 misfire about a month ago, pulled and checked the plugs and cylinder 1 is already looking burnt and the rest look new still. No check engine lights coming on yet, trying to catch and fix before it gets to that again to minimize damage.

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    Just a guess, but...

    Do you have a pix of #1's plug? What do you mean by burnt, very white (maybe melted)? I haven't heard of any common problem with injectors but over 50K any car can have a plugged injector. As you probably know, they can collect deposits which can alter the spray pattern and/or reduce the amount of fuel sprayed. The only way I know to 100% verify is to pull the injectors and put them thru a bench cleaning where the operator can see the spray pattern. (Once pulled, that clean/service costs around $100 for 4.) I'm not a big fan of the on-car used by most shops, but there are a couple machines that are effective.

  5. #5
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    The really melted looking one is the one I pulled last month the other is the recent one, both from cylinder 1, the other pic of the cleaner one is how the other 3 cylinders looked when I pulled them this last time
    20210519_161102.jpg
    20210519_160804.jpg 20210423_094822.jpg

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    I'm not sure what year your car is, but for 2015 the plugs should be replaced every 30K miles. I'd also use care to use the same brand and heat range as factory. I'm not sure about Fiats, but on my former car swapping brands could cause problems, even in the same heat range. My car never had a problem, but others reported quick fail on plugs.

    The 2 plugs on the left look normal to me. Maybe I can't see what you are seeing.

  7. #7
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    Those are oe replacement ngk plugs first swap done at 30k second done at 56k because of the misfire, the one with the still white ceramic is burning fine the darker ceramic is running hot due to less fuel in that cylinder, it's a 2014 with a little over 56k on it now, the first owner only put 29k on it in 4 years.

  8. #8
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    Try swapping the injectors around to a different cylinder? Or just buy a new one and swap the #1 and see if the problem disappears completely?

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