Alright so my car was misfiring last month so I have the plugs and wires changed. Then yesturday it started to misfire and lose a lot of power so I shut it down and started it back up. Sounded fine....until it hit seconded gear. Started to misfire and blow white smoke out the exhaust and smell like burning. Checked the oil and it was clean also checked the coolant and it was fine. Had it towed home and I am taking it in Monday to the shop. Any ideas what it might be? Head gasket?

 

If it was truly white smoke, that is usually coolant. That is usually head gasket. Was the vehicle running warmer than normal at any point?

 

It was not over heating. It wasn't like thick white smoke . So maybe it wasn't true white smoke

 

Did it dissipate quickly after leaving the tailpipe or hang around and build a cloud?

 

Dissipate

 

You can do a leak down test, and if you have cylinder/s that are leaking you should see bubbles in your radiator of its a head gasket.

 

If it dissipated like moisture coming out of the exhaust on a cold morning, I say it is likely moisture in the exhaust. Only place it comes from is coolant or condensation in the exhaust. Sounds like it was already warmed up so all signs point to coolant in the combustion chamber and head gasket.

It is definitely worth testing it out. I have had head gaskets that were good all the way up to max operating temp though..ran fine and no leaking/smoke then hit a certain temp and go nuts. That case was a little different as I had a faulty head bolt and the head had just popped off and was sitting in the rocker area. So maybe that caused it to act differently than in a typical blown head gasket situation.

In my mind, short of something really whacky, if you've got vapor coming out of the exhaust and not /smoke/ then the heads are probably coming off anyway.

Good luck with your car.

 

So I started the T/a today to have my father in law look at it and the battery was dead. Nothing was left on. So I jump started the car and it was running fine ! No misfire at all. Ended up buying a new battery and it runs great. Sounds better then it ever had. Could the crappy battery have caused the computer to go hay wire and make the engine run shitty?

 

A bad battery can cause all sorts of issues so basically yes..doesn't exactly explain white smoke but I guess when you factor in the catalytic converters, anything is possible?

 

Alright so the car has been fine for the last two days but today it misfired twice. It was while I was accelerating and lasted like 30 secs. Ran fine after that. All the fluids are fine but my oil smells like gas. 96000 miles on the motor. My ground wires look fine also. U guys think a injector is stuck open?

 

Is your alternator charging your battery ?

 

It is possible. Hard to diagnose when it is intermittent. The way I would check if one is stuck is to put a fuel pressure gauge on the rail and click the key on and off a couple of times. See if the pressure holds or if it leaks down. But if it isn't stuck when you check you may not see a drop. Still worth checking.

 

this problem is a pain in my *** haha. Same thing happened again. It seems to happen within the first couple minutes upon driving.Ill have to check the pressures

 

So my secondary air was removed with my headers and I have had a bad battery for a couple months now. Could my tune after my headers install gone corrupt? My misfire occurres 1-2 minutes after starting and that would be when the secondary air system would kick in

 

I dont know. It's a thought bit I figure a corrupt tune would be a no-run kinda situation. Can a PCM revert to factory tune? That would allow it to run but not quite right. I am not sure.

 

Jeff, pull motor, put in brand new LSA with 556 horsepower. Best solution I could come up with!

 

No, the tune can't change

 

Try swapping the crank position sensor. They can fail intermittently and cause all types of weird misfires at various rpms....ask me how I know lol

 

The new LSA option above might come with a new sensor...

 

Definitely a head gasket