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5.8 runs rich changed o2 and idle circuit heavy black smoke
1991 Ford Bronco

5.8 runs rich changed o2 and idle circuit heavy black smoke

(1991 Ford Bronco)
1 answer & 2 comments
Popular Answer
on August 30, 2015
Suspect fuel pressure regulator/injector issue .. Turn engine off and pull vacuum line from regulator.. Check for presents of ANY gas at all .. If gas present, replace regulator .. Check engine oil for gas contamination..see if over-full.. Possible MAP sensor.. Proper scanner needed for testing... This is NOT for the average diy'er!!
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on August 31, 2015
thanks I was suspecting over pressure at the injectors. still trying to find the mapp sensor
on August 31, 2015
It's not an over-pressure issue.. Diaphragm ruptured in regulator... MAP is over at heater box.. Look at vacuum line routing diagram under hood should show vac line to MAP... Suggest scan test!!
General Diagnosis
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on August 30, 2015
Suspect fuel pressure regulator/injector issue .. Turn engine off and pull vacuum line from regulator.. Check for presents of ANY gas at all .. If gas present, replace regulator .. Check engine oil for gas contamination..see if over-full.. Possible MAP sensor.. Proper scanner needed for testing... This is NOT for the average diy'er!!
Sign in to reply
on August 31, 2015
thanks I was suspecting over pressure at the injectors. still trying to find the mapp sensor
on August 31, 2015
It's not an over-pressure issue.. Diaphragm ruptured in regulator... MAP is over at heater box.. Look at vacuum line routing diagram under hood should show vac line to MAP... Suggest scan test!!

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