P0300 code-cylinder misfire detected. What to try first?

[paqman]

Originally Posted by jcwit

Discounting the battery will only reset the computor to the new settings, or in other words the computor will relearn the new settings. Like you say if you would but a new battery in the car more than likely it would be with out power for over 15 minutes, with no harm done.

I just did a tranny flush with LubeGard added and did a disconnect so the computor would learn the new settings and everything works better than before.

Cool I'll give it a shot.

[paqman]

Just thought I'd post a follow up here too, because I ended up posting a new question for my stuck battery. Anyway, the codes cleared just fine. Now we'll have to see if they pop up again. Thanks for all the help. Here's the other thread I started on the battery:

http://www.automotiveforums.com/vbul....php?t=1036970

[five-oh-H.O.]

Have you tried resetting the codes by doing the KOEO repitition? Thats where you turn the ignition to the on position without engaging the starter, in a fast repitition of 3 times, or maybe it is five times? but if done properly after the last sequence and the key is in the off position, your car's interior lights, dash panel lighting and headlights will flicker on and off and you will hear a short clicking sound. this clears the codes.

[five-oh-H.O.]

I should also, inform you that, I retrieved the same codes from my 96 escort after the check engine light had come on and what it was is that a valve seat had dropped into the #4 cyl. causing me to have to replace the head. Maybe you should do a compression test.

[paqman]

Originally Posted by five-oh-H.O.

Have you tried resetting the codes by doing the KOEO repitition? Thats where you turn the ignition to the on position without engaging the starter, in a fast repitition of 3 times, or maybe it is five times? but if done properly after the last sequence and the key is in the off position, your car's interior lights, dash panel lighting and headlights will flicker on and off and you will hear a short clicking sound. this clears the codes.

Well I fixed the issue by changing the spark plugs, and then removing the battery for a bit cleared the codes. They haven't come back, so I think the spark plugs were the issue.

[denisond3]

Those continuous memory codes might not even be cleared if you used a Scan tool and told it to do so. But I dont think it will matter if you go for an emissions test, since the computer will then (hopefully) be saying that there are no -problems present-. I took my daughter's 97 Neon for its emissions test, and it still had the code about 'loss of pcm power', though that isnt a code that makes the light stay on. It passed.
The code for 'loss of pcm power' supposedly goes away after the starter has been engaged 50 times, at least on a 97 Neon it does. I dont yet own a car that is OBD-II compliant, and Im thinking that I never want to either.

[paqman]

Originally Posted by denisond3

Those continuous memory codes might not even be cleared if you used a Scan tool and told it to do so. But I dont think it will matter if you go for an emissions test, since the computer will then (hopefully) be saying that there are no -problems present-. I took my daughter's 97 Neon for its emissions test, and it still had the code about 'loss of pcm power', though that isnt a code that makes the light stay on. It passed.
The code for 'loss of pcm power' supposedly goes away after the starter has been engaged 50 times, at least on a 97 Neon it does. I dont yet own a car that is OBD-II compliant, and Im thinking that I never want to either.

Well I took it to Autozone and had them pull the codes again, and no codes showed up, so I think I'm golden.