Random Misfire. Please Help.
Random Misfire. Please Help. When I start my car it runs fine, then once it gets to running temp it starts misfiring very badly, almost to where the car is undrivable. Then after about 5 minutes of misfiring it smooths out and there is almost no misfire at all. Then after a bit it will start again. I'm kinda leaning towards a bad coil pack but have no idea. Thanks for any help.
im throwing a code about the passenger o2 sensor not heating up fast enough but that code has been there since last october, the car sat for a bit because i blew the tranny, then i put the tranny, and tranny cooler in and it started doing it.
I'd also like to know if you're getting any other Codes.
The Crank Postion Sensor would be a great candidate for the cause of your misfire. If you decide to pursue this direction, I would recommend spending the extra cash to get a GM CKPS from the dealership or from an Online source.
I replaced mine in my 99 Sonoma, fighting a misfire, with an Autozone Sensor (twice!) and it gave me a Crank Position Sensor Intermittent Signal Code. Installed a GM Sensor and it cleared up this code and most importantly the misfire.
The Crank Postion Sensor would be a great candidate for the cause of your misfire. If you decide to pursue this direction, I would recommend spending the extra cash to get a GM CKPS from the dealership or from an Online source.
I replaced mine in my 99 Sonoma, fighting a misfire, with an Autozone Sensor (twice!) and it gave me a Crank Position Sensor Intermittent Signal Code. Installed a GM Sensor and it cleared up this code and most importantly the misfire.
