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05-28-2012
So Im slowing down for a stop light and all of a sudden the car starts shaking, and when we stop its sounds like its missing pretty bad. Ran the codes and it came up with the p0300 random misfire. It lists so many potential causes im looking for help. A couple months ago i had to replace an ignition coil and the icm.
05-28-2012
I'd start with replacing all spark plugs with new AC delco's, then cleaning the MAF sensor and Throttle body.
05-28-2012
There is no throttle body its injected, sorry.
05-28-2012
you most certainly do have a TB, and they get dirty and make the car run poorly. its at the end on the tube from the air box where the air filter is.
it has a butterfly flap like a carb, behind it is where its dirty.
05-28-2012
Ok, but would these problems cause it to start missing just that quick?
05-28-2012
the misfire is most likely your plugs are shot, and the wires, you have the icm and coils replaced already.
a dirty TB will just make it run rough and a rough idle and stalling, hard starts.
when i bought my car i had a po300, plugs and wires fixed that.
05-28-2012
Ok, ill try the cleaning and plugs and wires, thank you and ill post again asap.
05-28-2012
dont clean them, replace them, you can get copper plugs for 2 bucks each, wires for 30, good old stock replacement is all you need.
05-28-2012
That's what i meant, replace the plugs and wires and clean the maf and throttle body.
05-28-2012
does the car shake when it ALMOST comes to a complete stop every time u stop or just sometimes?
05-28-2012
Its just missing bad, it gets worse as the car warms up. I forgot to mention that i have put injector cleaner in it already.
05-28-2012
Its missing bad, its rough at idle but havnt taken it at highway speeds, it still runs pretty rough around town. it seems to get worse as it warms up.
06-05-2012
Hello again, I was testing the ignition control module. Is every male spade terminal (6) on the module supposed to be getting 12v when the key is turned on? Or is just one of them supposed to be getting 12v per ignition coil?
06-06-2012
yes. and ive seen misfires on many different cars. and it is almost always plugs/wires. sometimes it can be fuel injector. but i highly doubt that on an 08.
06-06-2012
Got the car fixed today. It ended up being the ignition control module. I replaced it and a coil just 3 months ago. I wouldn't have expected it to be a new part i just replaced. Thanks for the help to all of you. Until next time...lol.
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