So the other day while driving down the interstate the CEL light started flashing and it started running rough. The crank sensor wiring had got burned against the belt so I replaced the sensor. It still was idling rough so I changed the plugs (already has new cap and rotor) the plugs all looked normal except number 3 it was white which I think means it's running lean on that cylinder? But I went ahead and put a distributor on it, made sure it was still in time and timing belt was tight and adjusted the valves but still has the misfire. Any suggestions?

 

Oh and I checked the spark... has spark on all wires and all the sparks looked pretty close to the same as far as I could tell on the tester

 

P1399 is the only CEL code or are there more?

 

That was the onlyone and still is I can clear the codes and it will set same code.every time after about 30 seconds to a minute of idling

 

That's a misfire code without an specific cylinder account. Do a cold and hot compression check and see if there are any issues, specifically that #3 cylinder.

Is the engine running normal? Any hesitation?

 

Replace the old plug wires.

 

I'm going to replace the wires tomorrow it probably needs them anyways. And I had to go get a compression tester I'll do that tomorrow too.

Thanks for the input!

 

The engine ran really good until now but it has a terrible misfire now almost like it's firing but on the wrong timing

 

Did you check for a good/strong spark on all cylinders?

 

So a little update.... ran.a compression check today and it was even across the board except cylinder 3 (figures right) it had no compression dry or wet. Tore it apart and one of the exhaust valve on #3 was missing almost half of it.


Thanks for all the input guys

 

I would say cool but it sux that you have to dig into the head now