Engine coolant temp sensor, If you pull it you will be able to see if it is cracked.. I don't know why but the original sensors they designed the ceramic tips crack around the tip of the head.. It will make the car nearly impossible to start smoke when cranking the engine, and idle really rough racey infact. 15 dollars or so let me know if that worked for you
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hi, I use to have the same problem I had to change engine electrical wires, then I had to change the crank sensor and the module ( destributer ) first let him check the complete wires installation then if they are good let him change the crank sensor
Good chance that the fuel pressure regulator is leaking gas and needs to be replaced. The fuel pressure regulator is located at the base of the throttle body and when it's starts to leak when the engine is running, it starts to flood the engine causing it to run bad and rich in fuel. The other common thing that would cause this is a faulty EGR valve, due to carbon build up and will need to be cleaned or replaced.
Do a fuel drop down test, test pressure line with gauge attached...leave for a bit...does fuel pressure stay close to where it was or drop off fast... if it drops off test the fuel pressure regulator by pinching off the vacum line...while running...pressure should increase...if it doesn't then replace pressure regulator.
Good luck and keep me posted.
If you can start the engine by opening the throttle it usually means the IAC (Idle Air Control) is bad or the MAF (Mass Airflow Sensor) is not reading correctly due to leaks between it and the engine or being defective itself. Hard plastic "hoses" get left off the rubber boot between the MAF and engine quite a lot.
I have a 90 chevy k1500 350 tbi with same problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!
sounds like a fuel pump concern, next time it won't start see if it has fuel press, there is a pressure test port on the supply manifold that feeds the fuel injectors with gas, depress the schrader (like a tire valve) valve in it and see if pressurized gas squirts out.