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EF V8 extremely rich when cold 

 

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 Post subject: EF V8 extremely rich when cold
Posted: Tue Feb 08, 2011 7:16 pm 
Getting Side Ways
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Hey, my EF 5 litre is running EXTREMELY rich when it's cold, exhaust smells real fuelly, and it blows a fair amount of BLACK smoke, until it's warmed up, this is DEFINATLEY fuel smoke from running rich, not blue oil smoke, but when it's warmed up it's fine, I unplugged the fuel pressure regulator and the AFM to test, and it is still doing it. Also run a bottle of injector cleaner through it, however, when it's warm, it doesnt run rich and seems to work fine. What can I check next?

Gab
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 Post subject: Re: EF V8 extremely rich when cold
Posted: Tue Feb 08, 2011 8:03 pm 
Getting Side Ways
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clean the maf wire.
how old are the o2 sensors?
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 Post subject: Re: EF V8 extremely rich when cold
Posted: Tue Feb 08, 2011 8:08 pm 
Getting Side Ways
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thats just the auto choke on.

 

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 Post subject: Re: EF V8 extremely rich when cold
Posted: Tue Feb 08, 2011 8:12 pm 
Getting Side Ways
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jaysway wrote:
clean the maf wire.
how old are the o2 sensors?

o2 sensors could be VERY old, as they were the ones on the engine when I fitted the V8, also, how do I clean the maf wire?

Gab
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 Post subject: Re: EF V8 extremely rich when cold
Posted: Wed Feb 09, 2011 7:30 am 
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change the thormostat as if it is fully open when cold the computer is telling motor it needs more fuel the motor will worm up much faster with a new on and this should fix it
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 Post subject: Re: EF V8 extremely rich when cold
Posted: Wed Feb 09, 2011 11:09 am 
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Do a self test...could be as simple as an ECT sensor.
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 Post subject: Re: EF V8 extremely rich when cold
Posted: Tue Feb 15, 2011 11:14 pm 
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Ride: nf fairlane

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Hi there.. had same problem with my nf fairlane turned out to be coolant temp sensor. hope this helps.
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