Question about Starting

TK_05

Member
Feb 12, 2003
286
1
16
Las Vegas
when i start the car the idle hangs at like 1500 or so then drops to about 1k-900 (idle)... this is just the engine building the oil pressure right? because when im parking the car and put it in Park the idle goes back up and takes a sec or to to get back to idle.. then when i shut the car off its like a friggen diesel and i can honestly take the key out and have both my feet outta the car before it turns off... what u guys think?
 
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Well the idle thing is just the computer goin from closed to open loop operation (or is it the other way around). Anyways its just the computer trying to get the motor warmed up so the thermactor system is directed towards the heads and more fuel is being thrown in. Once warmed up the thermactor system goes to the cats. So thats why the idle is high then drops down after a few secs.

The dieseling can be a few things. Carbon buildup in the cylinders, too much fuel pressure, or fuel lines getting too hot. My car used to do that until i lowered the fuel pressure.