Hi ok i have an 1999 sunfire 2.4 i just got back from vacshion i was gone for one mouth and i went to start my car and there was smoke from back of the engine and when it is runing it's coming out

Of course it does. All the grounds and positive wires had to be disconnected. ALL of them have to go back and be secure. Sounds to me you have ground issues. Could also be pinched wires. (between the engine and transmission) Been there done that.

Fix the missing and all else may be fixed. Have you done usual tune up? Checked coolant temp sensor?

Sounds like one of the cables from the battery is bad. Could be corroded or worn or chewed in half.

check that fuel is getting to engine, next, are you getting spark, are your plug wires in the right order, are they all good, you must keep plug wires from touching each other, is the cap & rotor ok, coil ok, fuses ok, do you have a fuel pump relay, if so, check fuse in relay. is the fuel filter new, did any codes get stored ECM, put drygas in fuel tank. are spark plug wires fully engaged onto plugs, don't concern your self with any smoke, let's get the engine started first, CHECK EVERYTHING MENTIONED ABOVE, including fuel filter, air filter should be new also, todays fuel w/ ethanol is garbage, for older cars. is the mass air flow sensor for this car ? aftermarkets are garbage. let me know how things work out, my knowledge is not cheap, but I will help you to avoid egg on your face, KEN

I rekon yer turbos gone on the inlet seal side , pop the pipe from the aircleaner off and see if the turbos shaft moves up n down - engine stopped.

Do a tune up change spark plugs, wires, air filter, pcv ,and fuel filter.

sounds like the speed sensor has gone bad . Its located on the transmission . should have a couple of wire that plug into it .

escudo 2.0 V6, the idle is ok and the rpm quite ok, but smoke is so heavy when start in the morning, it dosent run smooth. can you help me to, i already change the spark plug but same stoyr, any solution?

HI.

Follow this step to keep running your sunfire.
1 - Be sure the battery is full charged.
2 - Is better if you put a battery charged
3 - Turn the key to run position and tray to start the car and leave with the key in run position,
With a watch let pass 10 minutes no less. you gonna see the security light flashing and stop flashing after 10 munites.
4 - After 10 munites turn the key to off position during 30 seconds, with watch on your hand, OK.
6-- After the 30 seconds try to star the car

I hope this solve your problem.
Please letme know.

Thank you for use fixya.

need to to do a injector test