97 altima miss

PEARL

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#1
P0325
P0304 #4 CYL.

i have checked plug, wire, and injector on that cyl
i have took a look at cap and rotor but did not see anything out of ordinary
if you drove the car you would never know, drives just fine
does anyone have a diag procedure on these codes they can post??

thanks

i know they have manifold gasket problems right around # 4...........i dont want to think about that right now......... ;D
 

Paul

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#2
Let me ask you,Are you losing and or low on coolant?Check the coolant recovery tank.Remove the No 4 spark plug,look down the spark plug tube with a light and see if the top of the pistion looks shiny clean or cleaner than the other pistons.You should see some carbon buildup on all pistons.I have seen and read about a few Nissan head gaskets failing.Causing erratic heat operation,misfires and coolant loss.A clean cyl/pistion is a sure sign coolant is leaking into a cylinder.