Hot at idle in drive, 20 to 30 psi.
Around 40
you don't, the idle air control IAC valve does it automatically. If your idle is off it has a problem like a vacuum leak, low fuel pressure, faulty or dirty IAC and others.
With key on engine not running pressure should be 9 to 13 psi Engine at idle pressure should decrease by 3 to 10 psi on a throttle body. On a multi port injection key on engine not running pressure should be 41 to 47 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central multiport fuel injection key on not running should be 58 to 64 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central sequential electronic fuel injection key on not running pressure should be 55 to 61 psi. Engine running at idle pressure should decrease 3 to 10 psi.
IT takes 7lbs. to keep the oil light out at a idle. It should have at lest 25lbs.to 30lbs. of oil pressure at or above 2500 rpms. If it has more that is fine to.
9 to 13 LBS (PSI) Correct answer is that if it is a 1996 to 2000 the correct fuel pressure is 60 to 66 with key on and not running 55 to 58 with it running at idle.
YOU CAN'T. It is NOT ADJUSTABLE. The idle is all computer controled.
How high is your idle? idle should be 800rpm good oil pressure is obtained at this idle
The idle is control by the idle air control motor from outputs from the Engine Control Module.
If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.
install a mechanical oil pressure guage. should be between 15 and 40 psi at idle and up to 50 at high RPM
No, the boost gauge should not show boost pressure at idle. At idle, the engine is not under load, and the turbocharger (if equipped) is not producing significant boost. Typically, the gauge should read atmospheric pressure or close to zero during idle, as the engine is taking in air without forced induction. Any positive reading at idle may indicate a malfunction or a vacuum leak in the system.
40 on idle