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Old 02 Jan 2010, 02:42 pm
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Default All 4 Cylinders Misfiring... What to Replace First? (98 Civic)

I have had issues with my car for a while know, but recently they have started to become more serious.

The first symptom was when I was driving, and quickly accelerated onto an on-ramp or at a light, my engine would bog down, putter a bit, then kinda click into gear and continue as normal.

I have replaced a lot in hopes of fixing this issue. Alternator, Distributor and cables, Spark Plugs, Fuel Filter, and O2 Sensor. None of it seemed to have worked.

Now I have a new symptom, the car has a tough time starting up in the cold. The battery is fine, but it just sounds like fuel is not getting to where it should be. I even noted a slight hint of gas odor when trying to start this morning.

I went to Autozone and they checked the CEL and got six codes... ridiculous. All 4 of my cylinders are misfiring. Codes are:

P0304
P0303
P0302
P0301
P0300
P1399

The codes state it could be a vacuum leak, an ignition concern, blocked fuel injector, blocked EGR passage, valve clearance out of range, MAF sensor faulty, blocked intake/exhaust, or H02s/AF (heated o2 sensor) fault.

If I had to fix one thing, which one would be the most likely cause? I would hope it is not the fuel injector, they are pricey, and that would mean all 4 of them went bad around the same time, I would think that's unlikely. I replaced the 02 sensor a few months ago so I would doubt that too.

Any and all comments are appreciated, especially those that have experience similar issues. Thanks.
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Old 02 Jan 2010, 08:39 pm
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Default Re: All 4 Cylinders Misfiring... What to Replace First? (98 Civic)

A few clarifications: 1998 Honda Civic EX with 138,000 miles on it.

Going to use a bunch of BG 44 just to see if it helps.

Then I will most likely get either a new ignition coil, or a new MAF sensor.

If all 3 of those things cease to do anything, then I will either ignore the issue (as I have for around 2 years) or make sure there is no vacuum leak, whatever that means.

Does this sounds like a decent game plan?
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