Let me confirm that I understand your problem correctly and I have some additional questions.
1. Engine can be started and it runs well but cuts off suddenly without any indication. No crank up cut back off.
2. No trouble codes are present now. No code are present now.
3. You are mechanically versed with the vehicle and performs the job yourself. Yes I'm am I work on car most of my life so far.
A ) Does keeping the throttle slightly open keep the engine running? No cut off.
B ) After engine stalled, were you able to restart, and was it easy? No will not restart in fact if I continue to start it will flood out.
C ) When engine is left cold, does it run for a longer time before it stalled? No the same every time start up cut right back off.
D ) Is the engine cut off time predictable, eg after a few seconds or could be long or short time lapse? The same everytime start up cut right back off.
When this occurs, it could be due to a bad ground, disconnected, shorted or wrongly plugged in sensor or faulty PCM.
Have you checked through all the wireharness connectors and grounding circuits? I have started checking all the wireharness and on the driver side kick panel there is two medium plugs below the parking brake is where I got a continuity on four of the wires. It was getting dark when I found them so I could not trace them out. I will do this Wednesday morning.
If the power steering pump is equipped with a pressure sensor, check if the sensor wire is shorted or open and ensure you have sufficient power steering fluid in the system. Check the prower streeling system it is full of fluid and the I did get continuity when I ohm it out.
Check for vacumn leakages between the MAF and throtte body. I check for vacuum lecks and could not find any.
Find a car repair manual for your Mazda 929 Repair Question.
Tuesday, December 15th, 2009 AT 6:12 PM