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6 injectors replaced! Why did they fail?
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10-02-2012, 02:59 PM | #1 |
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6 injectors replaced! Why did they fail?
My car was misfiring in cylinders 5 and 6 and so the dealership decided to replace all the injectors under CPO warranty.
My question is, why are the fuel injectors failing? Aren't they supposed to last the life time of the car? (and why does it seem like cylinders 5 and 6 are always the most problematic? ) |
10-02-2012, 03:18 PM | #2 |
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Just because they replaced them doesn't mean they were failing. I think you would have known if they were all bad. They likely replaced them because they fell under the recall notice.
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10-02-2012, 03:31 PM | #3 | |
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Does it have to do with carbon build up on the injectors that cause them to spray unevenly? |
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10-02-2012, 03:31 PM | #4 |
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First check if the misfires disappeared...
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10-02-2012, 03:43 PM | #6 |
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10-02-2012, 04:07 PM | #7 |
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I'd imagine they have a very low tolerance for error, which can be somewhat supported by the fact they need to be coded which I believe is to accomodate minor manufacturing inconsistencies.
If it makes you feel better, I have only 60k miles and cyl 1 is on its 4th inj, cyl 2,4,5,6 are on their 3rd injector and cyl 3 is on its 5th injector.
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10-02-2012, 04:08 PM | #8 | |
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10-02-2012, 04:16 PM | #9 |
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only the 1st replacement set was under warranty. I ponied up the rest for the following 9. Had my warranty voided. Twice.
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10-02-2012, 04:18 PM | #10 | |
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Car has cost me a lot of money, but I drive it harder than most.
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10-02-2012, 04:23 PM | #11 |
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I just bought one injector to fix my misfires in cylinder 3. I wanted to do all 6 but don't have the money to do that right now. I should also probably get a carbon cleaning soon since i'm at 51k miles...
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10-02-2012, 04:27 PM | #12 |
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I think the rare misfires could have been caused by my spark plugs... 47k miles and i haven't changed them yet
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10-02-2012, 04:28 PM | #13 | |
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My car has 60k miles, and had an issue with injector once and they replaced only the faulty injector under CPO. I love my car and it is tune with FBO and I drive it hard when i want but not everyday. Its been pretty reliable thus far, but you are freaking me out...
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10-02-2012, 04:31 PM | #14 | |
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1. If you lug your engine in 3rd and the misfires happen right away, it was usually a bad coil. 2. If you lug your engine in 3rd and the misfires happen after being in WOT for a little bit after full boost, then it was usually a bad injector (majority of the causes for my misfires). 3. If the car only misfires at really high rpm when going WOT, then it was the spark plugs. (rarely ever was the case).
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10-02-2012, 04:34 PM | #15 | |
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Overall, I haven't had any major issues. Never had a lpfp or hpfp go out on me in 60k miles (replaced both becuase I wanted to). I did break my drive shaft, but I drag race my car A LOT. Well over 300 1/4 mile passes.
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10-02-2012, 04:37 PM | #16 | |
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10-02-2012, 04:45 PM | #17 | |
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I think I will go bigger turbos before I go Meth, I also use the fuel injector cleaner every 6 months, I know many say it does nothing but I feel a difference every time I use it.
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10-03-2012, 02:46 PM | #18 | ||||
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Your cyl #1 issue may also be a carbon buildup issue on the intake valves. This can cause misfires and misdiagnosed as an injector problem at times. Did you have the injector recall done? If so do you know how many injectors they replaced? ( you do not automatically get 6 new ones FYI) Also if you need a carbon cleaning done shoot me a PM I can help you out. |
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10-03-2012, 04:31 PM | #19 |
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10-03-2012, 04:52 PM | #20 |
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Haven't the problems been more electrical? Ie the piezo crystals fail?
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10-03-2012, 05:55 PM | #21 | |
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10-03-2012, 06:54 PM | #22 |
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Hahaha I wish I did... It was hard enough finding a manual 335 that was AWD though so adding a CPO to that would have made it near impossible. I had been looking for months and got fed up and just took the risk... Kinda regret it now
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