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Old 17 Jan 2014, 07:01 pm
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Default Why is my car misfiring, only in certain gears at certain RPM?

I have a 2001 Acura 3.2 cl. About 140,000 miles on it in case that matters. One day I turned my car on and it was misfiring pretty bad, putting real bad, and had very stunted acceleration. I took it to the same mechanic I always have (my dad always uses him) he's a real old guy, but very honest, and inexpensive. Anyway, he wasn't quite sure what the problem was, but was pretty sure it was the coils, and suggested I replace them. He did so. Now it's much better, but still will misfire at certain RPM. I can drive it, and put it into auto-manual. but have to keep it @ higher RPM. For instance, it will start to misfire slightly at initial take-off, but as soon as it goes to ~2.5k-3k RPM it will cease, and I will shift to 3rd gear (goes from 1st to 2nd auto no matter what and only a second or two after accelerating), and have to keep it above 2k RPM or it will misfire, and cannot shift into 4th gear until 3k RPM. and so on... I also cannot put it into 5th gear without going over 60 MPH or it will misfire.































I brought it back to him and he seemed unsure, but had several maybes. The issue is I'm kind of tight on cash at the moment, and don't really have the convenience of putting hundreds of dollars into the guessing game. I have been putting it off, since I found the system and it drives fine if I follow it, but I do have to take an emissions test, and I'm sure it will fail.































I was wondering if anyone has any ideas, before I go into a new unknown mechanic, or just bite the bullet and take it to the dealer and live off ramen for the next month.































Thanks
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Old 17 Jan 2014, 07:19 pm
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Sounds like you need a tune-up. You could have a bad plug wire or a bad spark plug. I would take it to the mechanic if you can afford it. The only thing you could really do your self is to change the spark plugs and the wires but the wires can be expensive. A repair person can test the wires for you. Also, when you change plugs they need to be 'gapped' so you need a spark plug gapping tool. But it is not easy to correctly gap plugs, it takes lots of practice. I would take it to a mechanic.
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Old 17 Jan 2014, 07:32 pm
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was your timing belt replaced at 80,000 miles ??? if not I'd be replacing that and taking it to someone who actually KNOWS Acura cars (no disrespect to the old guy, but Acura's/Honda's are not 'generic' and to be taken to the neighborhood mechanic)
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Old 17 Jan 2014, 07:47 pm
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In order of likeliness =coil (there was only one bad, i never replace all since there not common)next most likely problem would be plugs ,,if you used aftermarket like champion or auto-lites, that is a problem ,or will be a problem,replace with PROPER NGK or DENSO plugs(they don't have to be gapped . as long as you don't drop them, lol !) ,,next would be a fuel injector or injectors which i have seen problems with several times on your car ,look at short term and long term fuel trims on scanner to determine if they are working properly ,, next ,compression/engine problem..if he doesn't no how to diag these problems i suggest you take to another reputable shop or dealer ''best of luck man ,and don't drive it that way you will destroy your catalytic converter ,(that's why your check engine light is Flashing..if its not than you Don't have a miss-fire, or its very minor ! good luck!(fyi your car should have got PLUGS and TIMING BELT AT 105k miles ..or timing belt every 7 years- but they rarely fail , and is Not your problem at this point..(and obviously your car does not have wires like the other gentleman mentioned) LET me no if you have other questions ,ill ck tomorrow..
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