Cel - Honda Prelude Forum

blutec · 07-25-2007, 02:22 PM

this morning my light came on right when i got to work.... read the code and it came out p0301, p0303, p0300, p1399...... cyl 1 and 3 are misfiring.... p0300 is random misfires, and 1399 is some honda code for tune ups i think.... i replaced the plugs and wires when i had 30k miles on the car and now it has 83k..... im thinking its my cap and rotor and mayb my o2 sensor.... does anyone have any input on this that can help me figure this out?

PininFarina456 · 07-25-2007, 03:06 PM

Your plugs and wires are definitely due. I would replace those w/ cap and rotor.

I think if it was o2 it would say o2 failure.

marcucci · 07-25-2007, 03:17 PM

The O2 is likely not a contributing factor, but I would definitely replace it as 1) at 83k it probably needs it and 2) with plugs/cap/rotor that old it will definitely need it (you likely have been running rich).

I would do all that and if you still have a problem, do a comp. test or have a leakdown test done. Make sure you don't have any bent valves.

blutec · 07-27-2007, 08:59 PM

so i changed the rotor and cap and took the spark plugs out and checked them.... wires and plugs were good..... moved the spark plugs around to different cylinders and i dont know but i feel like its running alot better now

.... need to buy the compression gauge to run a compression test next

marcucci · 07-29-2007, 08:15 PM

Moved the plug wirese around to different cylinders? Meaning you changed the plugs in relation to the cap or just moved some of the wires?

If you didn't check the wire resistance with a meter then you can't really tell if the wires are good or not.