well, the P0304 code has come up 2 more times. so I'm hoping the new coil and plugs will help. I also went to Advanced Auto and had them test the batt/alt. Battery is good, but alternator is questionable. only 13.0 volts when loaded. I verified this using my ODB reader and TORQUE app. only between 12.8 & 13.2 volts. so I'm going to bad an alternator too.
engine miss
- Thread starter Fialdj
- Start date
callihan_44
New member
I had a miss once that was hard to find in a chevy truck, I happen to pop the hood in the dark and found what was causing it..one of the plug wires had a small crack in the insulation and was throwing a spark about 2 inches in length to the block...couldn't see this during the daylight hours
well, plugs and 2 coils came in. I found the #4 plug had 2 cracks in it. I had the #2 plug crack last year. replaced all 6 plugs and the coils on #2 & #4. my truck is running much better. I believe the alternator issue is now a different problem, but because I get a 13.1 reading at the ECM I will replace it too. it just came in.
Thank for your help.
PS I asked NGK why the plugs would crack. the guy told me it's because I used a tool to install and they didnt go in straight. that would mean I cross threaded them, which I didnt. I used the socket and extension to turn the damn thing. any of you know why a spark plug would crack?
Thank for your help.
PS I asked NGK why the plugs would crack. the guy told me it's because I used a tool to install and they didnt go in straight. that would mean I cross threaded them, which I didnt. I used the socket and extension to turn the damn thing. any of you know why a spark plug would crack?
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themaestro
New member
Did you torque to spec? I can't remember off the top of my head what it is, but I know there's a torque spec for the plugs. It's not that much if I recall.
headpaneer
New member
The torque spec. is 13 lb⋅ft according to the Antman thread.
https://www.toyota-4runner.org/5th-...-yr-old-girl-can-do.html?highlight=spark+plug
rdruss
Senior Member
It was probably cracked before it was installed, dropped on floor, quick look, it's ok (not!). I had one once that was driving me nuts and as I pulled a plug to look at it as I turned it electrode up I thought I saw something move, it was the insulator around the center electrode that was broken and when I would flip it over to install it the porcelin would slide down and rest against the side electrode and shield it from firing. Strange things can happen!
