5.8 runs rich changed o2 and idle circuit heavy black smoke

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Aug 31, 2015

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What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1991 Ford Bronco. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

1991 Ford Bronco auto repair 1991 Ford Bronco estimates 1991 Ford Bronco questions 1991 Ford Bronco problems 1991 Ford Bronco recalls

What is your question?

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5.8 runs rich changed o2 and idle circuit heavy black smoke

What is your question?

leroye in Houston TX

Aug 31, 2015

1 Reply

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pushrodon Aug 31, 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!!

leroyeon Aug 31, 2015

thanks I was suspecting over pressure at the injectors. still trying to find the mapp sensor

pushrodon Aug 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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Popular Answer

What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1991 Ford Bronco. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

1991 Ford Bronco auto repair 1991 Ford Bronco estimates 1991 Ford Bronco questions 1991 Ford Bronco problems 1991 Ford Bronco recalls

1 Reply

Popular Answer

pushrodon Aug 31, 2015

leroyeon Aug 31, 2015

thanks I was suspecting over pressure at the injectors. still trying to find the mapp sensor

pushrodon Aug 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!!

Reply in Thread

Join the conversation!

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5.8 runs rich changed o2 and idle circuit heavy black smoke

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