Code P304 and P1404
My CEL came back again a few weeks ago. Just had a chance to pull the codes again. Same cylinder as last fall. I had swapped the coils back then, and it worked fine all winter, but it didn't get any highway time. Took it on the interstate and mashed the throttle (of course) and started spitting and sputtering. The CEL flashed a few times then stayed on. The code is for the same cylinder as before swapping the coils, so it'* not that. I think I'm just going to get a new set of wires and a new injector for that cylinder, the plug was new, but could've gone bad already I suppose. Inj 3 was bad when I bought it a few years ago, so it'* quite possible this one is going bad too. Anyone have luck with mechanic in a can for this, ie JB or 3M Fuel injector cleaner? I think it'* been 30k since I last ran a bottle through.
I'm assuming the 1404 EGR valve code is due to the misfire, or should I be looking at it the other way around? The EGR problem is causing the misfire. In the past, I didn't always get an EGR code when I got the misfire.
This is for the 99 ssei btw.
Last edited by Anything4APontiac; 04-15-2010 at 01:47 PM.
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