eicca

Something minor I've noticed lately. When the car is cold, it'll fire after less than half a second of cranking. When it's up to operating temperature, it takes a little over a full second to fire.

Doesn't sound like it's struggling at all, cranks strong and runs fine. Just wondering what might cause this. Do spark plug gaps enlarge when they get hot? They're on my replacement list...

1UZ-FE, by the way.

1QWKGS4

iTrader: (3)

I haven't notice any difference. In fact, mine crank better when warmed up.. lol (I think you're reading too much into it) unless it takes a long time to crank. I won't worry about a full second longer..

Both my cars under 50K miles and in Pristine condition.

mcomer

Temp affects fuel more than ignition. Heat soak used to evaporate the gas out of
carburetors (remember those?). Check your Fuel Injector systems for missing
heat shields or misrouted lines near exhaust or other hot pieces.

silverbul

Sounds like your crank sensor is going bad.

eicca

Didn't know that was a symptom.

silverbul

Yeah they go bad. & when the engine is at operating temperature and you cut your car off & it's hard to restart, takes longer to crank it's the crank sensor. Once that sensor go completely out all your gonna do is drain your battery trying to start.

burteboy

Your problem maybe dirty injectors. Let me explain. At the tip of the injectors may or could have a gum like build up not allowing the injectors to close properly. When this happens and you switch off the vehicle the injectors drip that is what would or could be the cause for the longer crank time. Perform a furl injector service ,one where they disconnect the fuel pump..

eicca

Injector service is on the tuneup list.

Crank sensor doesn't seem like it'd be the problem. It never takes more than just over one second to fire when hot, and it fires and runs perfectly healthy. Never hurts to test it though, of course.

If the injectors drip, would that cause fuel to be pooling around the valves? I just remembered when I took my mom's 2UZ apart to do the starter, there was some kind of fluid sitting on top of the closed valves. Not a lot, but enough to notice. Hers is just older than mine. Could have dirty injectors too.

silverbul

Symptoms of a crank sensor going bad