currently running t34 .63 ,swedish,55 blacks,wasted spark, als, lc.
closed loop
just fitted stack wide band gauge ,on tickover its reading 14.7.but driving at 70mph 5th gear @3000rpm its reading as low as 11.5 ,as soon as i floor it reverts back to chip and fueling seems to be fine .dont know what to check first i've changed the narrow band but hasen't made any difference,if i drive with the narrow band unplugged fueling comes up to 13ish
any idears where to go now
also went to fordfair and mpg was about 20

 

The ECU needs a narrow band signal Jason. Wideband wont work

 

just weld anothe bung in the exhaust and run both

 

as per post

 

i am running both narrow band for closed loop,wide band for stack gauge

 

just had mot and co was 3 % if closed was working it should be 0.9 or below

 

I must of missed that part of your first post lol.

The CO should be set to around 3% ( iirc ) without the closed loop running.

What narrow band is it? do you have it wired up correctly ?

 

its a bosch black to pin 2 ecu ,2 white wires one live one earth

 

its been working for over a year ,driving along one nite put the als on for about 5 secs ,since then the fueling gone wrong

 

Possibly the ALS has killed the narrow band sensor - have you tried a new one?

 

ive changed it but it made no differance .that was my first thought

 

Im sure i still have the sensor Stu supplied me for my closed loop.

Steve

 

both the two sensors i've got are from stu

 

bttt

 

tryed to set the co today at my local garage but couldn't get it below 4 % with the lamda plug in or unpluged

 

That's high, mine just went through MOT at 0.97% CO, 137ppm, NOT on closed loop, and runs perfect, even idling.
tabetha

 

Assuming the car has no electrical faults and the chip software is matched to the engine spec and parts,

I reckon you have high fuel pressure .....

 

just checked the fuel pressure ,its 53psi with pipe off 44 with pipe on

 

i know the co & hc readings were hi but it was still showing afr reading of approx 14.7 and on the co machine it was lamda 1.....
any idear on what to check next

 

up

 

have you ran the IAW software on it to check for any faults? a sensor failure of some sort is probalby most likely, or an air leak

fuel pressure should be 3.5 bar at idlle with the vac pipe off,
pipe on isnt really relivant, as the figure si totally dependant on engine spec,as this effects manifold depression massively

 

James you say air leak but don't the closed loop software adjust for this???
Reason i ask is i was trying to replicate a fault on mine L8 closed loop by creating a air leak to see if idle co would rise after taking dump vac off and boost gauge pipes off and adjusted idle to suit extra air the AFR still stayed around 14 to 15

I would presume that it would rise on a L1/L6 without closed loop control
was trying to create a fault a friends car could possibly have

Paul

 

it will to a point, but air leaks will effect map sensor readings, which can richen things up,
and you can get air leaks on the exhaust side which make the lambda sensor read incorrectly

its totally dependant on the idle strategy as to how effective closed loop is at idle,which again relates to engine spec

 

I would initially be checking the quality and accuracy of sensor inputs and the checking the quality of the lambda sensor and ECU earths on the vehicle.

This is correct. The chip has closed loop compensation settings that vary from cal to cal so where as one chip may allow a 25% compensation, another may only allow 5%. The ability to compensate also depends on the injector duty on teh load site above the correct one as the air leak will move the speed density map up a load site.

 

not yet will need to get it of trev secs is showing most sensors are working

 

james ,any suggestions on were to start from,fuel prss is correct ,ive changed the the lamba,but why is it showing 14.7 afr when the c0 is over 5%

 

maybe your wideband isnt caliberated correctly, or your als has damaged your wideband sensor?

 

even if its not reading correct i still cant get co down less than 5% and hc were over 800

 

would have deffo thought thats a sensor or wiring fault of some sort tbh,

chuck the iaw on it,

 

hopefully will get on the iaw monitor tomorrow and let you know the readings

 

still haven't got it on the iaw yet and still and its still pi..ing me off

 

bring it up for a set up

 

can you check a chip to see if its faulty

 

trying to get trev to put the iaw on it but rich has the lead and he is away

 

i would deffo check on the iaw first mate, id be 99% sure theres an underlying sensor issue, but yes we can test the chip, you could send it to us in your ecu, and we can test both at the same time

 

ideal thanks for that ........its starting to bug me now. ps hows the job going

 

the engine is freshly built and ive just finished running it in and just want to drive it now

 

going well pal,

 

still no joy with the iaw and donny is now 3 weeks away

 

any joy with this?
i had high co at idle, non closed loop
i got it on the iaw and showed the tps was incorrectly set
then found i had 2 airleaks after the throttle body even tho the engine was just built so i assumed it would be fine.
now i just gotta get it back on a co machine to check if ive fixed it.