Turns over but you have too keep pedal down. buzzing sounds from the back.
The buzz could be the fuel pump in the gas tank.
If it will run with the throttle open it could have an issue with the idle speed control valve or a dirty throttle body.
The computer controls idle speed by how much air enters the intake thru the valve.
SOURCE: Noise when turning the key to start my 2005 Pontiac Montana
might be the fuel pump. should sound like an electric motor running, whirring sound. like a very quiet dough mixer.
SOURCE: 2002 pontiac grand am gt 99k miles just died on
Could be the timing belt/chain. Common problem with this engine.
SOURCE: 2002 Pontiac montana won't start
The problem is most likely a bad connection at the battery or the underhood fuse panel behind the battery. Recheck these connections and included the ECT (Engine Coolant Temperature) sensor (wires and harnesses).
Fuel system? Relative to how gasoline engines work, one that has sat during the
8-hour workday is nearly as 'cold' as one which has sat overnight
(overnight will dip mebbe 30*F more, but this is practically irrelevant
to an engine). The one major variable is volatility of the gasoline, which is affected
by atmospheric temp especially when the engine isn't warmed-up. Starting this month (and continuing until fall) the 'blend' of gasoline
will change from 'winter' to slower-vaporizing 'summer' in most regions
of the country; you may have it now, or from some specific gas station.
If the car's Inlet Air Temperature (IAT) sensor (in the airbox), is
faulty and reading too high, then the combination could push your engine
'over the edge' in terms of the PCM trying to set the proper richness
for 'cold start.'
Keep us updated.
SOURCE: car dies when stopping, then starts up
check or get checked the idle speed control valve. hope this helps
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