I have a cobalt ss/sc stage two. I recently had to buy a brand new engine and swap it. After the swap the check engine light flashes only when i go past 40 mph. Anyone know what this is?

 

Try to get the code read and go from there

 

A flashing check engine light is usually not good; typically it means service engine immediately...do NOT drive the car hard until you get it checked out or bad things may happen

 

flashing means mis fireing

 

flash means it's happening right now.

 

miss fire... check the plugs and coils 1st

 

mean shut me off take me in im f*cked

 

last 4 are correct its missfiring if u keep driving it with bad plugs they might blow up ! change ur plugs, if the light blinks then it stays on then ur f'd !!! so go check it out like yesterday ! then test ur coil packs !

 

For whatever it's worth, I have a cylinder 1 miss and my CEL is stationery. It's never blinked..

 

i get random cylinder misfire

 

unfortunately misfire could be a wide range of things, most likely a plug or coil pack, but it could be anywhere from that to something as advanced as a vaccum leak up to low compression in that cylinder which would mean tearing down into the engine = $$$$$

 

plugs are brand new. They are the one step colder ones i got from ottp. Also the new engine brought stock plugs. I dont think its the plugs.

Its a brand new engine. Only have ran like.... 5 miles lol

 

Actually a flashing cel means your car is doing somthing thAt is not good for your cat emission based which means like everyone else said coil packs spark plugs bad ground somewhere loose plug causing pressure from the cylinder to come out. Fuel injectors faulty bad compression in a cylinder bad fuel pressure timing s wrong and so forth

 

Cool thanks guys. I'll look into it.

 

^ this!

a flashing CEL means that Damage will Occour is you keep driving it. Dont drive the car until you get it looked at.

 

new engine... case relearn will that flash?

 

hmm yea i was wondering, do we need a case relearn on the PCM for the new engine?
and if they do that will it erase the tune and ****?

im jsscriado's brother btw

 

I talked to a guy that work at a local dealer her and explained the situation and he told me to go to auto zone and get a reading for some codes.

 

It's a missfire

 

ok so i went to autozone and these are the codes that came up

P0300- cylinder misfire

P0053-oxygen sensor heater condition

anyone? could it be my relays?
cant be spark plugs, those are new.

 

Did u gap the plugs if so is it .035 what type of plugs make sure they are sealed correctly. And also our cars are prone to it. Make sure you don't have any ground wires look by your tranny. Replace you 02 sensor

 

make sure no ground wires are loose?
and the front o2 sensor is brand new.
and plugs r gapped right.

 

Are cars are prone for our wires, coil plug wires and ect by the tranny house to rub and come into contact with it meaning grounding out ... I would still do a crank relearn on ure car

 

what does a crank relearn do again?

 

Crank relearn help the computer learn the charaistics of the crank for say timing ad so forth.......