Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Cockney Boy]

Maybe worth buying a £30 one off eBay it may save your wallet and sanity

[tag]

Up stream lambda/ o2 sensor, controls mixture..........

[Nosebolt]

OBDII ordered

[Nosebolt]

Up stream lambda/ o2 sensor, controls mixture..........

TBh I dont know enough about these electrical cars, so would a bad O2 sensor cause intermittent rough running?

[tag]

Yes if the sensor is failing , or bad wiring to the sensor intermittent,  as i posted  it will run OK until the engine gets up to temp at this point  the ecu reads the o2 to adjust mixture if it gets no signal or a bad signal it will stay rich or lean if it stays rich it chokes up the engine, lack of power missing and back firing till eventually it stops.  if you let it cool down it will run OK again..
  i had this  problem...........
if you order a code scanner make sure it shows real time sensor readings,  you can look at all the sensors working or not with the engine running..... hope this helps you       

[demonicwillow]

As tag said and also when your engine is started every time it will run open loop which basically means that the ecu ignores the o2 sensor and injects a default amount of fuel, it takes somewhere between 30 to 60 seconds for the o2 sensor to wake up, once its operating correctly the ecu will switch to closed loop taking readings from the o2 sensor which if working correctly will constantly vary in voltage from 0v to 1v (lean/rich lean/rich etc etc) o2 sensors usually fail over a period of time and they usually fail giving a lean reading so the ecu will richen up the fuel/air ratio.

Symptoms of a failing oxygen sensor includes:
Sensor Light on dash indicates problem
Increased exhaust emissions
Increased fuel consumption
Hesitation on acceleration
Stalling
Rough idling

If your handy enough to find the correct wire going to the sensor you can connect a volt meter (set to a low range above at least 1v dc) and monitor the sensor yourself, using your obdII scanner you can set it to watch the o2 sensors and see that they are varying between 0 and 1v and drive around and keep an eye on them, also handy is your fuel trims, long term and short term, ideally they need to be around 0 which is ideal, a negative % reading is lean and a positive % reading is rich, the most they will go to is 25% which is when a check engine light will illuminate, but either way you do it, your scanner will be very usefull in finding this intermittent fault.

[isle of man]

The O2 is live once the engine achieves operating temperature and not before, so when normal temperature is achieved 80ish no matter how long this takes the O2 is ignored by the PCM.

[Nosebolt]

wish I could just fit a carb 

[isle of man]

But you can, the cost would be the APEX on this.

[demonicwillow]

The O2 is live once the engine achieves operating temperature and not before, so when normal temperature is achieved 80ish no matter how long this takes the O2 is ignored by the PCM.

No it doesnt ... when you start the car it is in open loop (default injection and no o2 sensor) for closed loop to occur the o2 needs to be up to operating temperature, around 600F, it takes around 30 to 60 seconds for this to happen and an ecu to change from OL to CL in around 90 seconds which is when the ecu adds in the o2 sensor.

the car also enters open loop at WOT and ignores the o2 sensor input, if it didnt the car would lean out as a result of the o2 sensor switching voltage and your car would fall flat on its face, not a good thing. WOT is usually considered 80% throttle or more.

[Nosebolt]

OBDII arrived and used, got codes

P0201 Injector Circuit Open Cylinder 1 - ? injector or wiring?
P0505 Engine Idle Air Control Fault - TPS and MAP changed should be fixed
P0127 Intake Air Temperature Too High - ? have fitted new air filter

have reset the codes as recon two are now fixed so will drive and wait for it to happen again and get new codes, if injector will try swapping 1 and 3 and see if fault moves if not could it be a wiring fault/short?

[Mike Pavelin]

is it worth checking the upstream O2 sensor? the old sensor was reused when new cat/exhaust was fitted

Yes

[Lukemagnum]

See how easy it is to fault find with electronics and OBD.

You still want to return to hit and miss dizzy timing and carbs?

BTW, high intake air won't be down to a blocked filter.

[Nosebolt]

with hind sight all those faults were down to me, at various times I run the engine with out various sensors, with No1 injector unplugged and with no airbox fitted

anyway after reseting the error codes the problem has not returned (just been driving on and off for 3 hrs), it does not seem right to me that just reseting the codes would stop the fault so recon it is still there just waiting to fuck me when least expected.

and yes give me carbs and a dizzy anytime

[Cockney Boy]

You confuse me Bruce (not hard I know) one minute you embrace technology and the next your want a dizzy lol

[Nosebolt]

  the difference is the tech I use does what I tell it

with this fucking car it goes wrong, hides the fault then lies about whats wrong, spends my money on new bits it don't need then asks for more.... bit like being married I suppose 

[Cockney Boy]

the difference is the tech I use does what I tell it

with this fucking car it goes wrong, hides the fault then lies about whats wrong, spends my money on new bits it don't need then asks for more.... bit like being married I suppose 

It could be worse, you cold end up like Bulldog lol

[Bulldog67]

I cant imagine at his stage of life good old NB will ever become ruggedly handsome, charismatic, and generally Fonz like 


I am willing to take some shekels off him in exchange for some life coaching tho 

[Cockney Boy]

I cant imagine at his stage of life good old NB will ever become ruggedly handsome, charismatic, and generally Fonz like 


I am willing to take some shekels off him in exchange for some life coaching tho 

 

[tag]

Think you'll find if you disconnect a injector then reconnect,   it will throw a code.
try disconnecting the front o2 sensor  it just plugs into the loom  and check  the plug socket for a good connection, then go for a run unplugged see if you get your symptoms.  cant hurt............

[Nosebolt]

2 days use and no fault.............yet