Need help please!!!!!!
#1
New Member
Thread Starter
Need help please!!!!!!
hey I'm new here and I just bought a chevy cobalt ss supercharged with a stage 3 kit on it like 2 weeks ago. It's been ok until yesterday. When i left work and startwd driving it started shaking as I was shifting gears and my check engine light started blinking. So I ran a diagnostic on it and these are the codes it is reading...p0300 p0446 p0128. Can someone please tell me exactly what I need to buy and replace to get it running good again? Or give me any tips. Id greatly appreciate it. Thanks,
Lauren
Lauren
#2
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Join Date: 01-31-16
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Please tell me you got a CarFax or Used Vehicle Information Kit before you bought the car. Stage 3 = modified, so did you even test the car out?
Anyways Google is your best friend, and you should get to know it well with a modified car.
- P0300 Random Misfire Detected Code
- P0446 Evaporative Emission Control System Vent Control Circuit
- P0218 Transmission Over Temperature
Got these from obd-codes.com
Check: Spark plugs, coolant levels (and condition) first.
Anyways Google is your best friend, and you should get to know it well with a modified car.
- P0300 Random Misfire Detected Code
- P0446 Evaporative Emission Control System Vent Control Circuit
- P0218 Transmission Over Temperature
Got these from obd-codes.com
Check: Spark plugs, coolant levels (and condition) first.
#3
New Member
iTrader: (2)
Welcome! Starting with P0446, it could be the under hood EVAP purge solenoid being stuck open and causing a vacuum leak. A simple test would be to remove the solenoid and attempt to blow air through it. If you are able to blow through it, then it has likely failed open and could be the cause of the random misfire code, P0300.
#4
Senior Member
^agreed, check and see if you can blow or suck through the purge valve in both directions. You shouldn't be able to when its off the car. The p0128 is a thermostat code that basically means the engine is not getting up to operating temperature fast enough. That is usually caused by a bad/sticking thermostat, very common in these cars.
#5
New Member
Thread Starter
Please tell me you got a CarFax or Used Vehicle Information Kit before you bought the car. Stage 3 = modified, so did you even test the car out?
Anyways Google is your best friend, and you should get to know it well with a modified car.
- P0300 Random Misfire Detected Code
- P0446 Evaporative Emission Control System Vent Control Circuit
- P0218 Transmission Over Temperature
Got these from obd-codes.com
Check: Spark plugs, coolant levels (and condition) first.
Anyways Google is your best friend, and you should get to know it well with a modified car.
- P0300 Random Misfire Detected Code
- P0446 Evaporative Emission Control System Vent Control Circuit
- P0218 Transmission Over Temperature
Got these from obd-codes.com
Check: Spark plugs, coolant levels (and condition) first.
#6
New Member
Thread Starter
One more question...
Sorry I forgot to ask this question in my other reply, so how can I tell if there was ever a stage 3 kit put on this car? The easiest way for me to find out would be ideal. Thanks again guys
#7
Senior Member
iTrader: (6)
Welcome, and just a point of reference for clarity on the forums use multiple paragraphs and/or double spacing for different statements.
Don't jump to changing the ignition coils right away, start with spark plugs. Although which plugs to buy will depend on the modifications to the car.
Take pictures of the engine bay, the pulley on the supercharger, and if you can see the fuel injectors get a picture of them as well. Users on this site can tell from that.
To find out if it is a GM Stage 3, does your AC work?
Don't jump to changing the ignition coils right away, start with spark plugs. Although which plugs to buy will depend on the modifications to the car.
Take pictures of the engine bay, the pulley on the supercharger, and if you can see the fuel injectors get a picture of them as well. Users on this site can tell from that.
To find out if it is a GM Stage 3, does your AC work?
The following users liked this post:
Slowbalt2000 (12-11-2018)
#8
Senior Member
You should invest in alldatadiy.com to get all the factory service information. It won't solve 100% of your problems 100% of the time, but it can be very helpful such as listing all the P-codes and the diagnosis steps for each P-code!! That is handy. Not to mention you will get wiring diagrams, part locations, and sketches of parts and how they go together.
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