Hi, I am trying to help my friends daughter with her grand am. It is a 2003 V6.
It is running rough and the code is P0300. I think that is random misfire. In addition to running rough it is making an ominous clanking noise.
First thing I did was check for spark on all cylinders with an in-line spark tester. Spark appeared to be ok. Next thing I tried was disconnecting the wires 1 at a time to isolate the clanking noise. With the number 5 wire disconnected the noise went away and the idle smoothed a bit.
I guess the question is what is making the clanking noise? Is it internal engine damage? What else should I check before giving up and having it towed to the shop?
Thanks in advance,
Mike
It is running rough and the code is P0300. I think that is random misfire. In addition to running rough it is making an ominous clanking noise.
First thing I did was check for spark on all cylinders with an in-line spark tester. Spark appeared to be ok. Next thing I tried was disconnecting the wires 1 at a time to isolate the clanking noise. With the number 5 wire disconnected the noise went away and the idle smoothed a bit.
I guess the question is what is making the clanking noise? Is it internal engine damage? What else should I check before giving up and having it towed to the shop?
Thanks in advance,
Mike