"Ricky Spartacus" <RickySpartan@mailandnews.com> wrote in message
news:d1e1d73f.0308290252.4971ebf9@posting.google.c om...
> Mechanical theory 3: Low compression. Compression increases as oil
> comes in contact with cylinder walls. Until oil has reach wall at max,
> oil light will not turn off. Low compression could mean low idle rpm.
> Diagnose: Test compression or clean oil filter screen.

Does that explain why everything is fine when cold?

> Electrical theory 4: I suggest unplugging the TW coolant sensor

I tried this (I plugged 1.5k ohm it is a walue as if engine is not
completely
cold) I measured TW (Engine Coolant Temperature sensor ECT) (TW is
old name for what is now called ECT) and it is ok (300 ohms when engine
hot).

> or O2 sensors, the computer may go into limp mode bypassing any electronic
> problem in the computer.

I haven't tried O2 sensor.

> You must reset computer if it does not idle
> to spec by disconnecting bat (or other methods) for 5 sec. Do not plug
> in the TW during idle as a precaution.
> Sorry I can't explain why fuel pressure drops in hot engine
> compartment. Fuel Pressure Reg fails by allowing too much fuel to seep
> back to tank. Disconnect vacuum hose is not good diagnose. Clamp fuel
> return line. Other unconventional: You could remove fuel bleed bolt
> in fuel rail and observe pressure by the amount of squirts (on stopped
> engine.)
> If fuel has evaporated in fuel line or rail then it will take less
> than a sec to refill the them.
>
> 1. "There is not enough air comming in when starting?" what air?

It needs to be the correct ratio of fuel and AIR in cylinder for engine to
work. Air can come in three ways to main throttle body:
1. with throttle valve opened
2. through idle valve
3. through fast idle valve

2. "...and it started ok?" Did you mean symptom had dissapeared?

I ment it had a little higher RPMs in idle than normal but it started
immediately without cranking for 2-4 cranks before starting like it
does when it starts poorely.

> > I tried disconnecting vacum hose going from throttle body
> > to fuel pressure regulator, and it started ok
> > ==>>> There is not enough air comming in when starting
> >
> > I then saw then adjusted idle air speed (RPM) which were
> > too low, and I'll see today if that was the problem.