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2009 Saturn Aura Questions

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Car not starting after warm up ignition switch okay we lay is okay starters okay could it be a ground
What seems to make the problem better or worse? Will turn over and start when cool down
How long have you had this problem? 3 days
I changed the throttle body , exhaust manifold, Knox sensor, nd spark plugs
It is turning off at different speeds and different street/weather conditions and times of day. What can I check?
Replaced thermostat because heater wasn't working and replace coolant. Neither AC or heater work
The "service airbag " message is on in the Driver Information Center. Is this a "dealer only" fix ?
4697657286
help me find out what this means.
have a 09 saturn aura 2.4l. alright, put cold air intake system. i left the mass air flow sensor unplug "bad idea", cause it would run fine without. Same time i had corrodited wires that ran 02 sensor upstream was not working. so pcm took charge for the IAT senor readings of -40 degrees when its 160 under hood. so motor stalled and would crank but not start. put couple shots of starting fluid and it would crank"thought it was the fuel pump. Put new pump in and it turned on but still not start. i looked over all corrodited wires and found wired frim alterntor to starter, cut bad wires to upstream 02 sensor with butt-connecters. but mini relays, some are loose in the front fuse box, runs powrtrn and run relay....all in all i have done everything. how can i jst bypass passkey3 system. already put over 500$ in this car. have had no ride for 3 wees
And a lock it come on 5-10minutes after driving
Sprayed with starting fluid it took two tries now it runs like normal, any ideas.
This does not happen on flat terrain when I apply the brakes. There is a little vibration in the steering wheel when it happens. Once I reach flat ground it stops. It does not happen up hill when applying the brake. The grade would be about a 2-4% grade. The knocking sound is loud. Thank you!
everything from spark plugs to trans and engine mounts have been replaced
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