injectors
#1
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injectors
sup guys i got a 98 gs-r b18c1 and i think im maxing out my inectors...
i got the victor x intake mani and i was informed the one a stock )p72) ecu with stock injectors i should be fine...
upon start up the engine idles fine at 1500 for about 3 mins then slowly goes down to about 1200 rmps then bogs down to 200rpms for about 10 seconds revs back up and idles at 700
my short term fuel trim percentage is goins nuts....starting at 0% going all the way up to about 46.9% holding for about 10 seconds and then droppping back down resetting and starting over again
it throws a lean code (p0172) and no its not the o2 sensors because theyre actually reading lean
SOOOOOOOOO i was wondering are their any injectors i can get that run off the stock ecu but are biigger to compensate for the air flow i have so i can pass inspetion?
any help is great
thanks
i got the victor x intake mani and i was informed the one a stock )p72) ecu with stock injectors i should be fine...
upon start up the engine idles fine at 1500 for about 3 mins then slowly goes down to about 1200 rmps then bogs down to 200rpms for about 10 seconds revs back up and idles at 700
my short term fuel trim percentage is goins nuts....starting at 0% going all the way up to about 46.9% holding for about 10 seconds and then droppping back down resetting and starting over again
it throws a lean code (p0172) and no its not the o2 sensors because theyre actually reading lean
SOOOOOOOOO i was wondering are their any injectors i can get that run off the stock ecu but are biigger to compensate for the air flow i have so i can pass inspetion?
any help is great
thanks
#3
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Re: injectors
i understand that....before i rebuilt it iw as driving it in the winter and sucked in some water and thats when the whole problem started...i figured it was a vacuum leak when it first started happeneing before i took it apart but now i know the vaccuum is good so you think that the water cou;ldve actually made it all the wat through the engine and hit the o2 sensor?
#5
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Re: injectors
o2 sounds like it took a ****. if you have a stock engine and stock injectors you either have failing injector{s} or a bad o2
stock 240cc injectors are cheap and so is the primary o2, you can replace all of it for around $100
the ST fuel trim going THAT lean is dangerous though, you shouldn't drive the car until you fix the situation
stock 240cc injectors are cheap and so is the primary o2, you can replace all of it for around $100
the ST fuel trim going THAT lean is dangerous though, you shouldn't drive the car until you fix the situation
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#7
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Re: injectors
o2 sounds like it took a ****. if you have a stock engine and stock injectors you either have failing injector{s} or a bad o2
stock 240cc injectors are cheap and so is the primary o2, you can replace all of it for around $100
the ST fuel trim going THAT lean is dangerous though, you shouldn't drive the car until you fix the situation
stock 240cc injectors are cheap and so is the primary o2, you can replace all of it for around $100
the ST fuel trim going THAT lean is dangerous though, you shouldn't drive the car until you fix the situation
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#8
Re: injectors
i understand that....before i rebuilt it iw as driving it in the winter and sucked in some water and thats when the whole problem started...i figured it was a vacuum leak when it first started happeneing before i took it apart but now i know the vaccuum is good so you think that the water cou;ldve actually made it all the wat through the engine and hit the o2 sensor?
but if the o2 sensor became contaminated, you have to ask yourself why it did. otherwise, just replacing it solves the result of the problem. but not the problem
#9
Daisy... Daisy...
Re: injectors
You will most likely have idling issues with larger injectors on a stock OBDII ECU. Do they still make fuel pressure risers?
Last edited by Dogginator; 05-24-2011 at 05:19 AM. Reason: Incorrect injector size removed.
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#12
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Re: injectors
Only the primary O2 sensor adjusts for fuel trim. If the sensor gives a biased reading, then the ECU compensates by adding or reducing fuel.
If the sensor is biased lean, then the ECU will start adding fuel until it throws the p0171 code.
If the sensor is biased rich, it will reduce the fuel until it throws a p0172.
If you are running 240cc, and you say your fuel trim was +, not -, it must be dumping gas in like crazy and you are likely running extremely rich.
#13
Honda-Tech Member
Re: injectors
p0172 is rich, not lean. You do not need larger injectors either.
Only the primary O2 sensor adjusts for fuel trim. If the sensor gives a biased reading, then the ECU compensates by adding or reducing fuel.
If the sensor is biased lean, then the ECU will start adding fuel until it throws the p0171 code.
If the sensor is biased rich, it will reduce the fuel until it throws a p0172.
If you are running 240cc, and you say your fuel trim was +, not -, it must be dumping gas in like crazy and you are likely running extremely rich.
Only the primary O2 sensor adjusts for fuel trim. If the sensor gives a biased reading, then the ECU compensates by adding or reducing fuel.
If the sensor is biased lean, then the ECU will start adding fuel until it throws the p0171 code.
If the sensor is biased rich, it will reduce the fuel until it throws a p0172.
If you are running 240cc, and you say your fuel trim was +, not -, it must be dumping gas in like crazy and you are likely running extremely rich.
similar fix though. if the ecu is just pulsing the **** out of the injectors it's either getting the signal to do so from the o2 or you have a leaking injector or two that's dumping in constant gas and causing a rich condition in the exhaust. actually, wait a minute, if the injectors were going mad the ecu would be reducing fuel causing a - st trim and a positive long trim.
this sounds more and more like a glazed o2 and or a car with bad plugs-cap-rotor, the ignition components usually cause a hunting idle though
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