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Cylinder 2 Misfire, but Zero Power Loss

 
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Old 03-03-2017, 06:40 PM
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Icon9 Cylinder 2 Misfire, but Zero Power Loss

So I've been getting a cylinder 2 misfire for a while. I've looked on multiple forums and cleaned plenty of parts including the
-IACV
-FITV, (both those two were clean when I pulled it off)
-cleaned the tb, replaced the tb gasket (no leaks)
-changed the spark plugs,
-cleaned the cylinder 2 contact point under the distributor cap (had a little bit of stuff on it but not too much).

I also did a compression test on all the cylinders, and all of them were within the 180-200 range. Cylinder 4 being in the lower end of it actually.
Additionally each spark plug wire seems to be sparking perfectly.

The only weird thing that happened was my cousin recommended me to switch to 10w40 high mileage with lucas oil stabilizer. So I did so and it gave me really bad morning startups to the point it would almost shake the engine and almost stall because I'm assuming its too heavy. I know we're supposed to use 5w30 but I wanted to see if I could stop some of the oil burning. I was actually getting this code when I was using 5w30 but switched to 10w40 since I had to add more oil anyway.

So I switched it out for regular 10w40, and it seemed to be working fine for the past few days with no issues, but my code came back today after a slightly rough startup.

So the strange part is that even though there is a cylinder 2 misfire, there is ZERO loss in power. VTEC pulls just as it should. The first cold morning startup is still slightly rough but I wont stall like I was with the lucas stabilizer. I also used fuel injector cleaner to see if that would help, and I feel like it did for a little bit.

My best guesses after all this trial and error would be either something with the fuel pressure or possible air in the cooling system from removing the IACV/FITV, or perhaps a bad sensor somewhere, it does smell like its running a little bit rich.

Any input or advice on the matter would be much appreciated, thanks for your time!
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Old 03-04-2017, 12:33 AM
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Re: Cylinder 2 Misfire, but Zero Power Loss

How did you clean the distributor cap?
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Old 03-04-2017, 04:53 AM
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Re: Cylinder 2 Misfire, but Zero Power Loss

@ravedojek I scraped white stuff off the points with a flathead, i was able to get a majority of it off
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Old 03-04-2017, 11:46 PM
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Re: Cylinder 2 Misfire, but Zero Power Loss

Maybe think about replacing the dizzy cap and rotor, not just cleaning it. White stuff shouldn't be building up inside unless moisture is getting in.

Also, the EGR can sometimes contribute to a misfire code, probably worth a clean too.

Is it throwing any other codes?
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Old 03-05-2017, 03:54 PM
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Re: Cylinder 2 Misfire, but Zero Power Loss

@tassievteclude I cleaned out the EGR and all the ports a couple of months ago so that shouldn't be the problem. It's just throwing the cylinder 2 misfire code, nothing else. Ill look into replacing the cap and rotor then.
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Old 03-06-2017, 08:00 AM
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Re: Cylinder 2 Misfire, but Zero Power Loss

How did you clean the egr ports?
If there is a lot of oil blow by, doesn't take long to plug up the egr system
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Old 03-06-2017, 05:07 PM
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Re: Cylinder 2 Misfire, but Zero Power Loss

@ogsmakdade I pulled all the plugs out used seafoam, and a wire to scrape all the gunk out, then took compressed air and blew it out of there as well. also cleaned the egr valve with spray and a screwdriver, being careful not to scratch the gasket or washers.

I'm a little hesitant to replace the distributor cap and rotor, because there are no other problems at all when driving, just the first start of the morning makes the engine a little rough at idle for about 3 minutes, not surging, but sounds as if the crank is hitting the oil, but it's not since im under the top fill line. But it gives me a misfire after that initial start.

Last edited by fredmand; 03-06-2017 at 07:30 PM.
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Old 03-07-2017, 02:35 PM
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Re: Cylinder 2 Misfire, but Zero Power Loss

It's most likely the cap, especially if it has not been changed for a while.

I was going through the same thing and changed plugs out so many times. I would also see water puddles near cylinder 2, thinking rain water was the cause.

After changing plugs and wires (all NGK btw) finally, I went for a drive on a damp day only to run into the same issue, cylinder 2 misfires, then a puddle of water near it.

I finally decided it was time to take a look at the dizzy cap and rotor. The rotor blade was fine but the cap contact points were worn. Comparing the stock cap to the replacement cap, you'll notice the prongs are longer on the new cap.
So I replaced the cap, and that has resolved my misfiring issues since.

It didn't just misfire upon start, it would misfire after about 5 minutes of driving then get to a point where I couldn't start the car right after turning it off. The cap is only $20 so you might as well do it.
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Old 03-08-2017, 02:39 AM
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Re: Cylinder 2 Misfire, but Zero Power Loss

@gchampaninh right on, thanks for the input I'll probably go pick one up tomorrow then.
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