well it was mot time today for the old 3 door and its failed on emmisions which i knew it was going to as ive just fitted a new msd chip and had not got round to setting it up yet
so i pulled the ecu for a play while it had the probe up its arse and it started at 7% i tweaked it a little and got it to 5.5% but wouldnt go any lower
i then did the reset thingy! 5 turns clockwise 2 turns anti and it went to 10%!! i now cannot get it below 8% for love nor money (actually fluctuating between 8 and 10)
its a 4x4 engine with l8 and 2wd loom, i have rewired the tps last time i checked it had appropriate readings at full throttle and idle on the tps and a smooth transition between the two
its had in the last few weeks
new cts
crank sensor gapped correct
phase sensor gapped correct
dizzy cap
plugs (standard ford gapped at 0.6mm)
rotor arm
act sensor? (brown one in manifold)
basically a full sensor kit from matt lewis bar the map and tps
its an l8 stage 3 chip for 500 cooler 3 bar map 803's and t3 turbo

any ideas what can be causing it, i would have called msd but they were closed by the time i was mot'ing it so couldnt!

 

Whats the fuel pressure set at?

Is the map sensor working correctly?

 

fuel pressure is 3 bar and 3.5 with no vac
how can i check the map sensor is there a resistance check? or something

 

It's a bit crude but you could hook a meter to the map sensor and see if it is actually changing, whilst sucking and blowing on the pipe, if it stays the same it's knackered!!
tabetha

 

ill give it a go tabs lol!
ive actually got one on my mk2 escort that i can pinch just to try as i know that one works

 

btt map sensor made no difference

 

is the chip from reputable tuner?
had similar problem years ago and went onto a chip using standard baby board and never had problem adjusting co again,
are you running lambda sensor?
seem to think i maybe replaced mine at some point to pass mot,
hope you get it sorted,

colin

 

no lambda mate its an msd chip so should be a good one i might just trailer the car up to them and get them to sort it as i need it right for cumbria show at weekend lol

 

righ small update ive been probing away at my ecu and the readings i have for my tps seem slightly out i dont know whether this will make much difference to it or not so see what you guys think
at idle its 0.11v
full throttle its 4.75v
also my map sensor (3bar) reads
idle 0.5v
when revved hard 1.65v
when revs are dropping back to idle it goes as low as 0.3v then quickly goes to 0.7 before settling back to idle at 0.5v
does this sound about right or not?

 

anyone?

 

does that reset procedure work on an L6 ecu??

 

There is no reset procedure for them (P8 does), what are you wanting to do?

The above is just referring to sensor outputs.

Martin

 

I have an L6 ecu I moved the co2 screw and I want it go back to oem settins