k I bought this car with the issue the guy couldn't pass emissions. I figured he couldn't pass emissions because of the misfire= unburned fuel. Anyways scanned the codes and it's coming up with misfire in all cylinders and o2 sensor. The car runs but misfires pretty bad especially at low rpms. I was looking around and someone else had the issue the same and it was the timing belt a tooth off. Well I checked the timing belt and it's fine. The plugs, wires, cap and rotor, o2 senors and cat have all been changed out. Anyone have any ideas I'm trying not to replace everything on the damn car lol.

 

So you changed everything but the source of spark?

Test the dizzy coil

 

No I didn't change all that stuff the previous owner did. Question I don't have my meter here at the house. Will a coil from a td43u work in that dizzy ?

 

had a brand new td43u went out and swapped the coil pack, rotor & cap started it up same **** misfire

 

Year make and model and if its swapped? I am having similar issues with my gsr swap try the distributor coil and look into the CKP sensor below the lower timing belt cover that's whats giving me trouble.

 

MM&Y of car would help.

Tossing parts at a problem is an expensive way to troubleshoot that problem.

I will say it again tonight, have you checked/redone your main grounds, costs nothing and even if it is not your problem, it can't hurt.
Did I mention it cost nothing?

When was the fuel filter last replaced?
If you do not know, it's way past due.

Speaking of fuel, what is fuel pressure?

Is the problem spark related?
Have you checked what the spark is like, [use only an HEI spark tester to check spark?

Have you pulled the spark plugs and checked the color, color/condition of plugs right after driving the car can help point you in a direction. 94

 

98 civic cx d16y7

 

And the rest??? 94

 

On another note today I swapped out the ecu with buddies didn't help. I did notice today a couple of times when sitting at a traffic light it did smooth out for a few seconds at idle then went back to rough idle/misfire I'm clueless

 

today I check the fuel pressure and it is at 36psi. I almost out of options here and it still misfires on 1,2,3,4 cylinders this is starting to get crazy

 

Valve adjustment?

 

Compression test

 

gone traded that thing for another problem lol now I got an issue with a ef has a b16a bottom end with a b18c head on it and it hesitates idles fine and everything just when your on it just doesn't have the power it should

 

Same questions, what is fuel pressure?

When was filter changed last?

But this time what is pressure with vac hose on and with vac hose off? 94

 

I guaruntee you it is the ignition coil or bad connectors to the igniter

 

Does the miss go away at higher RPM's or does it follow it?