Just fitted a msd closed loop chip

Took the car into work to check the co and this is what i have

Wtf is going on



Could this be a sensor problem i used a bosch lambda sensor(not from msd) so should i try another lambda

This is all new stuff to me

 

Did you follow the procedure for resetting the CO screw aswell that came with the fitting instructions for the chip?

 

yeah did all that

 

put a multimeter across ecu pins 1 and 2....you should see the rise and fall in voltage from the lambda sensor....

all base settings correct? ie fuel pressure

 

you did the wiring change on your tps? if it was L6....before

 

fuel pressure set to 3 bar

just checked wih the multimeter set to 20v and was getting a reading of .065 ish

and got a 2nd hand 4x4 tps off Ryan and swapped the wires over this morning

 

fuel pressure on stus chips is 3.5bar at idle, vac pipe off...giving around 3.2 pipe on.


how did you set the tps up?

how old is your ect sensor?

 

ect is less than 2 years old

set the tps to .35v via pin 1 and 17

the engine has always had high co but this takes the piss

 

try unplugging the lambda ..does the c.o change?

you deffo have a sensor fault of some sort,

lambda, ect, map sensors would be the more likely

you got a secs monitor?

 

got a secs moniter the map sensor part has never worked (thinking about it always shown 0.00)

 

back home so cant see if the co changes but i have a zeitronix afr if i could use that

 

lamda wouldnt cause the mixture to be out by THAT much tho! i suspect a more important sensor fault

 

check your secs wiring then for the map signal....you may find its over reading...

the white wire on your secs loom, goes to pin 15 on the ecu plug

 

they can do jim, mine went to 8%odd when the lambda was unplugged, it depends how the global mod is adjusted iirc.

they always go rich when lambda sensor fails for safety

 

its got a new loom off Ryan but was the same this with the old loom

 

think i will get a new map sensor and see what that does anything

 

jtech, not THAT rich tho

the closed loop wouldnt even adjust that much extra fuel if it was reading constantly lean on the sensor!

 

mine did jim,,,it ran at 0.90% LS plugged in, and 8%unplugged

on 55lb injectors.


i could weaken it off,by using the global mod, but i ran it uber safe at the top, so chose to run it rich, the closed loop dealt with it a treat low down

mind you i probably had big issues back then

 

Best to phone stu and make use of his excellent after sales service matt.

 

i don't beleive for a minute that stu sets his base map to 8% and the closed loop is the only thing bringing it down to lambda 1.

there must be something fishy going on

 

it was a year ago

its all new now

 

i tried to call him but the lazy git only does a half day on saturdays




























with any luck stu will see this post and might be able to shed some light on whats going on

 

hes playing metal gear solid on his ps3 right now

 

Alright for some. !!

 

i know, i must be doing the wrong job

 

not sure if its any help bu twhen i had my car set up at stus kenny couldnt get the ecu to lock on to the lamber sensor, it kept returning to base map, turned out the lamber was fooked

 

Stalker

Matt I assume the car is warm etc whenyour checking the co? does it idle very smoothly or seem to slightly hunt?

 

tev, it shouldnt be 8% when its stone cold

 

yeah nice and hot fans had cut in/out

the idle is fine/smooth (idle valve disconnected)

 

rubbish im all out of ideas then lol

 

Evening Matt, before i go back to MGS, have you actually tried triming it with the CO screw? Some of the ECU analogeis circuits seem to differ. try taking 1 - 2 turns anti clockwise off the trimmer.

failing that, i would be looking at ECT/ACT/LAMBDA.

 

Hi Stu
yeah tried adjusting the co screw didnt make a lot of difference (was at 9+ co)

can you do me a deal on all of the above sensors + map sensor as at least then i can rule them out

 

also on the afr its about 10.5 at idle what sort of figure should be looking for

 

did you get the lambda just for this ? or for a wideband gauge ?


if you got it for wideband gauge have you defo got the simulated narrowband going to the ecu ?

as i belive the ecu closed loop runs off a narrow band signal


just a thought

 

14.5-14.7 ish id say

 

it should be bang on 14.7 as it's closed loop

10.5:1 would be considered "properly rich" even if on full boost at full revs

 

Jim it will cycle as it's in a closed-loop feedback system

e.g.

Lambda < 1: Trim fuel
Lambda > 1: Add fuel

ad nauseum.

Neil.

 

pmsl @atu playing ps3 that shit will stop when young un makes a appearence

 

doesnt stay static jim

take it you have seen a lambda signal on a scope then......

 

yeah but it will wander around 14.7 not 14.5