sohcpower1

I just did a 2 hour drive today and when I was heading back the car started to misfire going up hill at 65mph the cel started to flash and then It was fine. Only seems to do this under load I replaced cap and rotor the plugs and wires are a couple months old. Any ideas?

Former User

Pull the CEL codes.

sohcpower1

Misfire code p1399

Former User

^Brands?

Did you replace the fuel filter?

What engine?

Bone stock Civic?

sohcpower1

Valuecraft? Stock motor 1.6 non vtec haven't done filter this only happens in 5th gear at 65mph or at least that's when it's really noticeable and the cel starts to flash until I let off

Former User

Install the Honda-recommended properly gapped NGK spark plugs.

Replace fuel filter.

Then go from there.

sohcpower1

Plugs are ngks and new I will try filter next

Former User

Did you verify correct gap on the plugs?

P1399 is a generic random misfire code. If the CEL still turns on or blinks after replacing the fuel filter, then next pull the codes by jumping the service connector. Post the codes you recover using this method.

sohcpower1

Alright I'm not sure how to jump the service connector?

sohcpower1

Po304 p0300 p0302 are the codes I pulled this morning

joey1320

If you have new plugs, wires, cap, rotor and fuel filter(which honestly I don't think it's your issue), then go ahead and perform a cold and hot compression test and leakdown test.

sohcpower1

Haven't done fuel filter yet. Would a bad distributor do this?

sohcpower1

Just did resistance test on wires two were in low 4s and the other 5s if that make sense

joey1320

It would but considering that it only happens when under load, I'm thinking its something more mechanical than electrical. You can swap one out, but it won't hurt to do a compression test to see the condition of the engine.

Former User

Did you gap the spark plugs?

Have you inspected the inside of the distributor? Did the rotor screw fall out? Is it loose? Is there oil or red dust inside the distributor? Is the inner dust cover missing? Post pictures.

Given the misfire is 2 specific cylinders, the suggestion to do a compression test is reasonable, if you rule out a trivial ignition system issue.

sohcpower1

Rotor screw is good. There was a no oil or anything inside the distributor I did one compression test on cylinder 4 and it was 120

Former User

Why are you avoiding answering the question about gapping the spark plugs?

Compare compression in all 4 cylinders. Do you know how to do a compression test properly?

sohcpower1

There gapped at 40 I'm not avoiding it I know there fine just spaced it. Well I did one cylinder and somehow managed to break the compression tester taking it out.. Yeah just my luck

Former User

The proper gap is 0.043".

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sohcpower1

I answered all the questions relax don't need ur attitude