Hi all,

'02 Accord EX.

I recently had a bad misfire (I started a thread for it but the problem has somewhat changed). I replaced the spark plugs and wires, and that made it 90% better. Distributor and rotor had been replaced less than a year ago and are good. Then I removed and cleaned the intake manifold and EGR valve and passageway.

I have had a CEL 0325 for awhile. I replaced the knock sensor, but with a cheapie ebay sensor, and afer resetting the code, it came back pretty quickly. I'm going to get an OEM sensor from a junkyard if possible & will buy one if not.

I also have a 1457 code, which I'm hoping is just my gas cap. Someone stole my cap and I had an old rusty one laying around so put it on, and this code came up within a day. So I feel pretty confident that's the problem. Will replace with a good cap this weekend.

Now, the problem: after cleaning the intake manifold and throttle body (which were unbelievably caked in goo), the car ran as good as new for a few days. Today I drove it to Durham (25 miles away), and there was a slight misfire while at low revs a couple of times; but as soon as I began accelerting, it was fine.

On my way home, however, the car conked out multiple times when I was coasting. It held idle just fine, if I could get to idle. But several times as I was gliding to a stop, the engine conked out and the dash lights all lit up. It started right back up every time, and I made it home okay, but the problem got worse as I went along. For the last mile, it *really* struggled to stay alive.

I know Nissans have something called a Boost Controlled Deceleration Device, which ensures the engine keeps getting air/fuel flow when your foot is off the accelerator. Do our cars have something similar?

Any ideas where I should start?

Thanks!

 

Solution found, just in case anyone is interested.

I changed the oil.

That's it.

After researching this issue for days, I found more than a few posts/threads outside and inside this forum where a Honda mechanic recommended an oil change to fix this specific kind of misfire/bogging under acceleration. Why? How? I don't know. But it worked. I've put 300 miles on it under every condition since then, and it's been perfect.

So there you go.

 

Interesting. How long was the previous oil in there for?

 

Old oil was in for less than 2,000 miles, BUT it was almost a full year, since I didn't drive the car from November when the original misfire started, until just a few weeks ago.