SnowmanV8
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I know my V8 efi is over fueling I Will be checking injectors tomorrow. What else should I examine. It only happens under full throttle and going up hills.
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SnowmanV8
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Its over fueling not over full.
doz
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Leaded right foot?
SnowmanV8
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I think I Will rewrite the original post.
jamesmartin
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how do you know its over fueling is it worse when hot than cold
SnowmanV8
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Its been diagnosed by a mechanic. Yes worse when hot
classic kev
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I have to say I really don't understand this. At full throttle how can it be overfuelling? and how can you measure it?
The thing is this, the injectors are triggered by the coil and the injector pulse is controlled by the ecu working from a fixed map. Even with cats, the 14CUX ECU ignores lambda at WOT as precise fuel metering and control isn't needed so it basically sees a condition that says dump fuel in as fast as possible.
why does mechanic say this??
unless you leaving a black trail of smoke like on full choke (carby like) and plugs come out damp and black or car has been run up on dyno with o2 sensor up exhaust how is he going to know?
but things that could upset fueling not are..
.
blocked air filter.....this will make run rich..but wont burn more fuel
dodgy fuel regulator..this could make it burn more fuel..but more than likely all the time.
unless you leaving a black trail of smoke like on full choke (carby like) and plugs come out damp and black or car has been run up on dyno with o2 sensor up exhaust how is he going to know?
but things that could upset fueling not are..
.
blocked air filter.....this will make run rich..but wont burn more fuel
dodgy fuel regulator..this could make it burn more fuel..but more than likely all the time.
Spunka
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Sounds more like struggling to get fuel when it needs it to me
SnowmanV8
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It smells of fuel when stood near it or if you are stopped with window open. New exhaust is thick black inside after around 1200 miles max!
I would have said so but all the overfuelling signs are there and 2 mechanics when presented with the evidence say over fuelling! I would like to say it's the fuel pump in tanks but I would rather not mess with that untill I rule out cheaper options as cash is tight!
jamesmartin
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over fueling is unlikely to be fuel pump more regulator on the injector rail injectors or faulty temp sensor
Of which the ecu temp sensors are notorious
SnowmanV8
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Is that the one you told me to change? Be stripping down injectors and starter tomorrow to test it all then trying to get it alive for the plains by sunday!
forgot about the temp sensor..good point..
SnowmanV8
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Changed Temp sensor just checked a diagram. Injectors and fuel regulator tomorrow then go from there with her! Any-one local got a V8 starter?
Spunka
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Is the Ecu brainy enough to sense over fueling, bring a light on and reduce power
Ive never worked on one , asking out of interest
Ive never worked on one , asking out of interest
jamesmartin
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the only fuel tweaking is via lambda sensor and even then you dont know if its right or wrong
jamesmartin
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injectors can be checked bu using 8 same size containers on for each injector and crank engine ,if theres an injector fault its unlikely all of them so if different amounts collected it tells you something
SnowmanV8
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No idea! Just gutless uphill and with boot down! Shame as it is nice when running "normal" Does get worse when it does it while hot!
Right so just unplug one at a time and crank it into a pot, Mark and repeat?
Right so just unplug one at a time and crank it into a pot, Mark and repeat?
