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Old 07-18-2017, 07:24 PM
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have a 502/500 2000 blue mtr m p i. what if any sensor or sensors control cold start up i still have post flood issue all injectors are o kay. cool fuel with press reg is o kay. fuel press around 38 psd. fuel pump o kay i was wondering if i have a sensor or sensors that are telling the engine that i am starting cold when actually the engine is at temp and it is flooding me out when i go to start engine.....
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Old 07-18-2017, 07:40 PM
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Coolant and air temp sensors. You should be able to find the ohms vs temp values and easily check with an ohm meter.
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Old 07-19-2017, 01:05 AM
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AND MAP sensor - for rich conditions

start up very rich can also be leaking injectors - The 500 EFI are very poor injectors.
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Old 07-19-2017, 01:31 AM
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iat on a 500efi tune wouldnt do it even if sensor thought it was -40 as it has very little fuel modification % if any from what i rember. Ect, i think it adds 18 or 22% if it defaults to -40 c, bad map sensor could easily do it but it would be chuggy and on verge of flooding anytime you werent at 100 map/wot any time it was running. If your ect was bad it would ad that extra fuel all the time also, not just at start up
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Old 07-19-2017, 01:35 AM
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Is tune stock or modified, i was tuning a whippled 38 sonic and we had cranking prime pulse or initial key cycle prime pulse the same as 502mpi and for some reason a stock 500 didnt use it and everytime we key cycled it and cranked it it chugged a cloud of fuel and loaded up the plugs to point it was almost flooded.
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