padres2k1

I need help someone.i own a 91 240sx,with 160,000 miles.
when the cars starts in runs fine, no smoke , no noise no nothing.after about 20 min of driving , when i hit high rpm's and very ocasionally some lower speeds, a very nasty smelling white smoke will billow from behind the car.it will start to idle very very badly, like 300 - 400 rpms.my guess is it, bad head gaskets.....would this be a proper assumption? and if so will the head themselves need replacing as well.

any knowledge on this would be great
thank you very much ....glen from ohio

240sxspeedracer1

i had that exact problem with my former car, thats why i got rid of it.  U can tell if its ur head gasket by checking ur oil.  If its really high and mad thin, then its ur head gasket.  U would have to change it if thats really the prob, that could cost around 400-500 bucks, so i hope thats not ur prob.

S13Grl

Yeah you're definitely burning some oil there. Check the head gaskets. Other than that, the car runs normal?

oberkill

Actually if it is blowing white smoke it is most likely coolant, smoke from burning oil has a blue tint to it and a burnt smell. Does your exhaust smell sweet? If it does it is definatly coolant and you most likely need a new head gasket. Get is check before it gets bad, if cooland is getting into your oil and you are driving it around still thats not a very good idea....

Alan

ZeroGS14

could be your head gasket...could aslo be your piston rings