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Q: Why does my 1994 Volvo 850 non turbo start then die? on 1994 Volvo 850

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Since purchasing this car i have replaced the plugs, plug wires, distributer cap, rotor, fuel pump, fuel filter, MAF and the IAC. The last time the car started and stayed running i back up, it started sputtering, i gave it more gas and it backfired so hard that it blew off the oil cap. Ever since then, when i turn the key to start it, it starts runs for maybe 2 seconds and dies. I have checked both the fuel pump relay and the fuel injector relay. The car seems to have great fuel pressure since replacing the fuel pump. I have not been able to have the codes checked.

Please help.

Thank you!!!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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You are taking an approach to fixing this problem that is all backwards. You need to perform a diagnosis first, then replace parts. Start with reading the codes, then troubleshoot accordingly.

BTW, you can check your codes for free, without a scan tool.

Post the code here and maybe we can help.
Thank you very much for that information. I will do that and post the codes.

I checked that codes. For the fuel system 1-1-1, and for the Ignition Codes 1-1-1. What do I do now? I need to also say that at one point a mechanic friend of mine was going to bring his hand held diagnostic tool to check the codes and he told me to disconnect the negative wire on the battery to clear the codes and try to start the car. Well, I did and the car still did the same thing, start, run for maybe 2 seconds and die. So, obviously the codes were cleared and, I assume, it doesnt stay running long enough for it to send a code to the computer. I hope you can give me some advise. Even, it is something that I have not done and you think could be the problem. Thank you for any advise you give me.

I wanted to add to his now. I have had one mechanic tell me it could be the temperature sensor. I have had a different mechanic tell me to re-visit the mass air flow sensor because I installed a used one in the car. He said it will shut down the car if it is not reading the air flow correctly. I also had a person who owns a volvo, same make and model as mine, tell me to check the rpm sensor. To pull it and see if there are any metal shavings on it, and if so clean it off and re-install it. I was wondering if you had any comments on any of this. Thank you.
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