2004 nissan sentra engine misfire what do i do?

Question

I got this 2004 nissan sentra 3 days ago  it first started as a cylinder 3 missfire p0303 i swaped the coils between cylinder 3 and 2 no change the next day it changed to cylinder 1 missfire and crankshaft position sensor or engine speed sensor. All new spark plugs new camshaft sensor and crankshaft sensor still no change it still missfireing. there is no intake leak the injectors are getting the correct pules to run the sarkplugs are fireing. The injectors are clean. Im just absolutely confused upon what to do. Any suggestions?

Answer 1

Hi there,

These cars have issues with the head gaskets, I would do a pressure test on the cooling system for one hour, then remove the plugs and check for coolant on top of the pistons.You have to leave the pressure tester on it for an hour or it won't show anything. You could also check the timing and the wiring. Possibly a compression test. If you are still getting the code for the crank sensor you might be out of time. This would cause misfires as well.

Comments

Already done that with no fluid on the cylinders and the compression test good wiring is good the timing is correct as well