Cliffnotes: Fired up my car, got a blinking SES light, drove it, wouldn't go away, got it scanned, threw a code (P0300 - multiple cylinder misfire) and I don't know what to do!
Alright, I am sick and tired of this problem so I thought I would bring it up to see if you guys could offer any insight. Well this morning I drove my car to Morton (drove roughly 70 miles) car ran fine both ways. Well I get back to work and when I fired my car up to leave it sounded funny, had a little shake to it, ran weird, and eventually the SES light started blinking. Well this has happened before, and usually went away in a matter of seconds, well this time it didn't! I drove it down the road to Auto Zone and had it scanned and it showed the code P0300 for a multiple cylinder misfire. Well that is what I was expecting.
Now my question to you is: Why is this happening? This isn't the first time either, this is just the worst it has ever been.
Car is a 2000 GT, and only has 21,360 miles on it. Everything is stock with the exception of the K&N drop-in filter. Stock plugs, wires, and ignition coils. I don't know if I have a bad plug or wires or what? I figured that was where to start. Also I have some mixed fuel in the car but don't know if that is the problem. On Thursday I put in 90 octane and this morning put in 87 octane. Could my computer be reading funny because of the gas? For the longest time I ran 90/91 octane, but within the last month or so I mostly have been running 87 octane.
Any ideas on what could be the deal with my car? I don't want to take it to the GM dealership just so they can stick it to me!
Thanks, Zach
Alright, I am sick and tired of this problem so I thought I would bring it up to see if you guys could offer any insight. Well this morning I drove my car to Morton (drove roughly 70 miles) car ran fine both ways. Well I get back to work and when I fired my car up to leave it sounded funny, had a little shake to it, ran weird, and eventually the SES light started blinking. Well this has happened before, and usually went away in a matter of seconds, well this time it didn't! I drove it down the road to Auto Zone and had it scanned and it showed the code P0300 for a multiple cylinder misfire. Well that is what I was expecting.
Now my question to you is: Why is this happening? This isn't the first time either, this is just the worst it has ever been.
Car is a 2000 GT, and only has 21,360 miles on it. Everything is stock with the exception of the K&N drop-in filter. Stock plugs, wires, and ignition coils. I don't know if I have a bad plug or wires or what? I figured that was where to start. Also I have some mixed fuel in the car but don't know if that is the problem. On Thursday I put in 90 octane and this morning put in 87 octane. Could my computer be reading funny because of the gas? For the longest time I ran 90/91 octane, but within the last month or so I mostly have been running 87 octane.
Any ideas on what could be the deal with my car? I don't want to take it to the GM dealership just so they can stick it to me!
Thanks, Zach
