my s13 starts and runs but then wont start after ??? help!!!!

[Norberts13]

okay, so i have a 89 s13 ka24e (auto) in the morning when its cool out side it starts right upafter driving it short distance its starts right up but if i drive it for a while or its really hot outside it doesnt start it wont even crank over but i have power to everything else on a cool day it will start all day no probs usually only happens on hot days when the moter gets hot. ive checked my connections and replaced my starter and checked my relays and fuses but i cant figure it out. my automatic seatbelts dont work sumtimes when i plug them in it start weird huh? and sumtimes when i pull my ignition switch fuse out and put it back in it starts.??? whats wrong with this piece of s***?

[My RB25]

Off the top of my head it sounds like crank position sensor. But to be honest with you I'm really not sure if our cars have them. Almost all newer cars do, but I'm not sure if they were used on simplier cars like ours.

Sometimes when CKP's go bad, they fail when they heat up and then let the car start again when they cool down. But even when that happens, the car will usually crank. That's a weird little quirk you got there, sorry I couldn't be more help, but I'll think about it for awhile

Edit - Shot in the dark...ECU? Only reason I say that is because when you say you pull the ignition fuse, it'll start.....another idea, distrubitor? The control mod inside it could be failing when it heats up.

[91white_ka]

Cam angle sensor is inside the dizzy......hmmm

[Norberts13]

what is the ckp?

[91white_ka]

^^^^^no I idea man.....and I've bult a few ka's