Hi im posting this forum for a friend of mine....well he has a 90 landcrusier and he says it haves problems when starting the truck when the engine is warm/hot...It starts when its cold but just not hot. anyone ever had this problems b4? Oh! and by the way he already change the heating sensors but still. anyhelp would be great!

 

Vapor lock? Is it fuel injected or carb? Is it sparking? Is it getting fuel? Could be a gremlin in the crank circuit on the ignition thats opening up when its warm.

I assume it cranks OK? If the head gasket is leaking collant into a cylinder it can make it hard to start but not impossible when its warm.

 

Well he's not familiar with the gremlin crank circuit...can u please post a pic showing where's it at? thanks!

 

A gremlin is referring to a problem that comes and goes. Ignition coils and other electronics can have issues with heat that causes circuits to open up. I would not be suspecting the coil though. Depending on the distrubuter set up, some have 12 volts suppled to the ignition during cranking and then a ballast resistor drops it to about 9 volts during normal running. I don't know how that ignition setup is wired though.

You still have provided very little info about the engine.