just got a multiple misfire code. I was washing the car at a carwash and when i was gettin ready to leave the car stumbled alittle(hardly anything, but enough for me to notice). As i pulled away the SES went off. I had it read and it was p0300. I have had the Opti, plugs and wire done recently at a local GM dealership. I called them up and said they were the last ones to work on my car having anything to do with ignition, so it may have been something loose or whatever?

I came home and disconnected the battery(both terminals) and waited a few minutes. I reconnected it and started it up five times and drove it around the block. I ran through first and second gear hard and came home. NO CODE???

Any ideas......................?

Perhaps something is loose? I did notice that the negative battery cable was loose(barely more than hand tight) when i was taking it off, but its been nearly three months since my Opti incident, why SES now?

 

Check to see all the plug wires are firmly connected.

 

Did you spray any water under the front of the car, possibly getting the ignition components wet?

 

nope, just from the top. I didnt even spray off my wheels

 

drove on it all day today and no codes? all plugs on snug......