said no mods.

 

Yeah..car is stock.

 

Definitely check the timing next.

If that looks good, pull the valve cover and check to make sure the head is in order. I was hunting down a really bad misfire about 3 years ago, and it ended up being a missing rocker arm for the #2 exhaust valve (I got the car used, God help me).

My symptoms were different than yours (it only broke up over 5.5k) but if it isn't the timing, then I'd look in the head next.


Are there any other symptoms that might be clues (even if you think they're unrelated)?

 

Well here's the update, I tested the spark plug wires and there was no spark coming from cyl 3. So I replaced the wires hoping that was the issue but it wasnt. After installing the wires there was definitely a spark but car still backfiring & engine light remains on.

I will look into the timing, but how typical is it to jump while in normal driving conditions? Any clue..

 

It's not typical. But with the back-firing that you've had, it makes it more suspect.

I'm out of ideas on this one; as long as you've confirmed you've got both spark AND fuel going into the cylinder, then I'd check the timing. After that... take it to a good mechanic I guess?

 

That's exactly what I did, it turns out that the fuel solenoid that controls all four fuel injectors was out (rare).

He replaced it and the car is running like a dream! What a frustrating experience!!

Thanks for all of your inputs.

 

Fuel pump relay?

 

Holy ***** - well, glad you got it fixed!

 

hey i am having the same problem sometimes its intermitant and other times its a dead miss on cylinder 3, my evo is modded with bolt ons and a ecu flash from mellon, im a mechanic and tryin to fix this, you said it was the solenoid that controls the injectors? do you mean the fuel pressure regulator fixed your car rocco? thanks

 

hey what do you mean the solenoid that controls the injectors? the fuel pressure regulator?