will the o2 sensor fix my problem?

[yoshimitsu9]

hey guys,

my sprinter is runnning a big port 16v 4age with no o2 sensor, it is running rich as all hell. tomorow i plan to check the spark plugs and run some injector cleaner thru. i have the grey injectors on the engine atm (FYI they are the 200cc 1.4ohm off a 5SFE) will changing them over to the pink injectors (4age) help? to my main question will the o2 sensor fix my richness problems? according to my neighbour who is a mechanic says it will fix the problem. according to the thread that asks the question about the o2 sensor concludes in saying that it will make little or no difference.

any help is appreciated,

cheers,

stefan

[rthy]

well I dont know about a 16v but my 20V ecu will automaticly go into a fault mode when theres no O2 sensor. When this happens it uses more fuel. It would be a start thats for sure

[damo101]

o2 sensor is part of the emissions control shit..it serves as a feedback control loop for the ecu to adjust the a/f ratio...its there to save your cat converter as well..coz the old cat cons can only be efficient when the a/f ratio is in a specific range otherwise it fucks the catalyst up and u end up with a busted cat..having the o2 sensor should solve your problem

[mattysshop]

question... why did you change your injectors??? the pink ones you talk about are 200cc also.. these pink injectors suit the big port ecu with the air temp sensor, and instead of having a dignosis box, they have a large yellow plug that you bridge for the fault codes..

if your running injectors slightly bigger than your ment to.. stock ecu do not compensate for this.. hence why it's running rich.. they think for example there is a 180cc injector there.. but if you have a 200cc injectors in there its still opening up just as much as the 180cc..

check your coolant temp senders at the back of the head and thermostat.. in stock trim the temp sender has alot to do with how rich it runs..

[yoshimitsu9]

question... why did you change your injectors??? the pink ones you talk about are 200cc also.. these pink injectors suit the big port ecu with the air temp sensor, and instead of having a dignosis box, they have a large yellow plug that you bridge for the fault codes..

if your running injectors slightly bigger than your ment to.. stock ecu do not compensate for this.. hence why it's running rich.. they think for example there is a 180cc injector there.. but if you have a 200cc injectors in there its still opening up just as much as the 180cc..

check your coolant temp senders at the back of the head and thermostat.. in stock trim the temp sender has alot to do with how rich it runs..[/b]


the reason it has those injectors in is because there were 4agze injectors on the engine previously and when i got the car wired i said chuck the grey injectors in not know the difference between the pink and grey were. i tried putting in the pink injectors but the car would not turn over (yes i did disconnect the battery). i have ordered an o2 sensor from autobarn but they are taking ages with is http://www.ae86drivingclub.com.au/forums/emoticons/rant.gif

[mattysshop]

what type of ECU is the car running?? do you have all the emmissions stuff conntected, and a proper thermostat, etc.. there are other sensors that have more effect on fuel than o2 sensor.. o2 sensor on 16V and GZE ecu's make dick all difference.. i have run both, and not run both.. and i got the same fuel economy..

[mattysshop]

i think it's just that you have the wrong injectors with the wrong ecu..a simple o2 sensor doesn't make the car run rich as all hell..

a mate of mine runs a GZE ECU/injectors/coil packs etc etc.. everything off my GZE.. on an NA bigport twinky motor.. and it gets awsome fuel economy..

i think you just have the wrong combo.. does your harness have a diagnosis box? (where you jumper T1 and E1 for base timing etc.. )

[yoshimitsu9]

what type of ECU is the car running?? do you have all the emmissions stuff conntected, and a proper thermostat, etc.. there are other sensors that have more effect on fuel than o2 sensor.. o2 sensor on 16V and GZE ecu's make dick all difference.. i have run both, and not run both.. and i got the same fuel economy..[/b]

im running a JDM ae86 ecu, im beginning to think i need to take it somewhere to get checked out. the thermostat is an after market one.

if i were to clean the injectors what would be the best method? this would be with them out of the car

[Hen is a total nutcase]

If you are using a stock ECU you NEED the stock injectors. Get some AE86 injectors and put them in (clean them before fitting if you feel like).

Or get an aftermarket ECU and get it tuned to suit the bigger injectors.

O2 sensor makes approx SFA difference, if you notice the car is running rich then something other than the O2 sensor is rooted.

Hen

[riceburner]

Hen is a total nutcase & Mattysshop are both right.

O2 sensor alone wouldnt cause rich fuel. If your unlucky it may slightly but you would never notice it.

As mentioned, 4age injectors, but these buggers back in and all should be sweet.

I would start there.

If its still rich then other problems have arisen.

[yoshimitsu9]

according to this web page i do infact have the correct injectors. so infact it is somthing more than injectors
http://www.geocities.com/MotorCity/Pit/997.../Injectors.html (http://www.geocities.com/MotorCity/Pit/9975/dataBySubject/Injectors.html)

my loom contains the "c" type plug injectors.

if somone can elaborate there please do.

i think its time to have the thing tuned

[driftae86]

plug that sucker iiiiiin brother


it wouldnt hurt and would cost barely anything for an exhaust shop to do it. its also a good way to narrow down possible causes for your running rich problem

[yoshimitsu9]

a mate said to check the coolant temp sensor, would not having a cold start mechanism or idle advance affect this? the idle always sits on around 1100rpm

[damo101]

u've got the o2 sensor already anyway so plug in the o2 see what happens then try other things if its still the same...elimination better than guessing everywhere..but the injectors makes sense.ecu doesnt know theres a 200cc there

[mattysshop]

if it's a stock ecu.. there can be little done in the way of tuning.. basically you can adjust the timing.. thats it..

the cold start mechanism you speak of... you mean the fittings with the coolent hoses?

the temp sensors i am talking about are at the back of the head, green plug, and brown plug..

i have asked this 10000 times befor but once more will not hurt i spose..

DOES YOUR WIRING HARNESS HAVE A DIAGNOSIS BOX IN THE ENGINE BAY, OR A LARGE YELLOW FEMALE 2 PIN PLUG?

[yoshimitsu9]

if it's a stock ecu.. there can be little done in the way of tuning.. basically you can adjust the timing.. thats it..

the cold start mechanism you speak of... you mean the fittings with the coolent hoses?

the temp sensors i am talking about are at the back of the head, green plug, and brown plug..

i have asked this 10000 times befor but once more will not hurt i spose..

DOES YOUR WIRING HARNESS HAVE A DIAGNOSIS BOX IN THE ENGINE BAY, OR A LARGE YELLOW FEMALE 2 PIN PLUG?[/b]


diagnosis box i am not too sure about, but the large yellow plug i do have

[johnny_08]

yea i also have this problem with my bigport and the o2 sensor wasnt connected and didnt make a difference when i reconnected it. ive taken it to a few mechanics and they havent a clue, so u reckon its the temp sensor at the bac of the block?

[yoshimitsu9]

the temp sensor at the back of the block is plugged in... so i think its safe to say that it isnt the issue unless theres the off chance that wires have broken within the plug

[johnny_08]

oh soz yoshi, talkin to hen or matty http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

[LordNafe]

Running rich? RUn shit loads of timing and make the most of it http://www.ae86drivingclub.com.au/forums/emoticons/happy.gif

[mattysshop]

pull out the green and brown sensor from the housing.. the sensors themselvs might be faulty.. or corroded..

ok the big yellow 2 pin female plug is the plug you jumper to set your base timing.. you don't have a diagnosis box in this case.. and the pink injectors are the ones to use with that harness/ecu combo..

also things to check are your fuel regulator.. and the vacumme line that goes to it.. make sure it's getting a good vaccume signal off the plenem..

[yoshimitsu9]

is this the connector you are talking about mattyshop?

if it is shoudl it have the fuse in it or not?

please bare with me if it is wrong as i am new to the electronics game

[mattysshop]

without changing anything else.. take the 60psi out of the malpassi, and run it at 45psi with the vaccume line off the reg.. once set at 45psi put the vaccume line on..

to give you a rough idea.. ever 10psi extra rail pressure, about 12% injector flow is increased WITHIN REASON.. doesn't mean you can crank 90psi through 200cc injectors and have 320cc (approx) injectors.. meaning you can solve a small lean spot, or overfueling via this means..

60psi is waaay to much.. leave the grey injectors in there that you have and try running 45psi... most toyota FPR's are about 2.9 bar which is just over 40psi..

[yoshimitsu9]

that was actually 60 psi at idle http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif more like 75 or 80 under load. me and a mate did the job, its running much smoother, no flooding under load, takes off easier and with less revs. at idle it is 28 psi and under load is 45psi

thank you for your help mattysshop, your an absolute legend

[riceburner]

You were running 75-80psi thru a bigport and you was thinking the o2 sensor might have something to do with it bwahahahahahahahahahah

Why you have a malpassi anyway, its not like you need it with anything less then 280rwkw.

Im surprised it ran at all with that sort of fuel pressure. I bet you were blowing spark plugs left right and center.

[yoshimitsu9]

the sprinter was an ex race car, it had a tuff built 4agte with 180rw/kw, the dude i bought it off sold it as a long motor for 4k. so he left the fuel system in and chucked the na bigport in. ofcourse i didnt put it in, why would i need a 500hp fuel pump?

EDIT: took the car out tonite, it now gets somewhat normal economy i wont know till i fill the tank next

[mattysshop]

perfect.. glad to help http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif