My car cranks and runs for 2 seconds, then shuts itself back off. What might be the problem?

Asked by Mar 02, 2014 at 03:09 PM about the 2000 Buick LeSabre Custom

Question type: Maintenance & Repair

I've replaced alternator, mass airflow
sensor, and pcm. It all started when
the alternator went out. Replaced it
the drove it bout 30 miles the it shut
itself off, well killed the engine.  Still
had accessories power. Try to crank it
and it shut itself back off. Put a code
scanner on it and it was saying mass
airflow sensor, replaced it. Reset the
code. It went about 5 miles and shut
itself down again.  Checked it again, it
said the same.  Before I took that part
back we checked fuel pressure, it was
at 50psi, checked coils, coil plate, and
wires,all of which was replaced bout
3 mths ago. Another friend of mine
said it might be the security system
so we checked and reset it. He
confered with one of his friends and
they said it was the pcm, so I
replaced it and went through the
whole security setup again.  Car is
still doing the same.  Cranks, runs for
bout 2 sec then shuts the engine
down.  Any help would be greatly
appreciated.

5 Answers

105,915

Did you buy an oem mass air flow sensor or a cheap one on line? I have got bad ones before.

1 out of 1 people think this is helpful.

I got a new one from O'Reillys, with lifetime warranty, took it back and got another just like it. Not the rebuilt

105,915

Oh ok that's good. Will it stay running if you feather the gas pedal?

5 out of 5 people think this is helpful.

No effect

im having same problem with my 92 cadillac i pull up code and it says mass air flow sensor shorted so im thinking thats whats wrong with your car shorted in the sensor wires

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