MOT Failure...Gutted

[Prof]

For the most part it\'s down to fuelling on idle - if you can adjust the PFC just for that part of the MAP, it should be fine as there is no load on the engine - you should be able to get quite close to ideal AFR ratio and hence low CO and HC readings.
 
I have a similar problem which is caused by having a walbro fuel pump, so fuel pressure is higher on idle and the ECU is not mappable and even though it\'s chipped, it\'s not set for the fuel pump pressure.  I\'ve been able to lower the emissions by adjusting the BAC valve and air bypass on the MAF - but these are things you don\'t have on the FD.
 
For you guys - you need to control fuelling on idle - you should be able to leave the rest of the MAP alone, as the MOT man is only interested in the emissions at idle (or should be - for the no cat 3.5%/1200ppm test).
 
Other tricks are to throw BIO fuel (Ethanol) in the tank for the MOT test, as it burns much cleaner, and then refill the tank after the test with normal juice, and/or fit a cat into the exhaust system for the test and take it out after.
 
New plugs and a warm engine also help as the bish said.

[trotter]

T mine failed today same garage as yours,wife took it in for me they used wrong test - did you ring up to complain ? i intend to,passed last 2 years there no problem diferent person tested
Catalyst equiped vehicle with closed loop control
fast idle
co 0.3% vol did 0.35 fail
hc 200ppm did 31ppm pass
lambda 0.97 to 1.6 did 1.26 pass
passed 2nd idle test 0.23/15/1.25
natural idle test
co 0.5% did 1.39% fail
exhaust gas test not successful permission denied
comment:# engine speed measurement was by-passed
also failed the lights "nearside & offside (no beam pattern) headlamp not in good working order adversely affecting beam image
:Grrr:Grrr:Grrr

Gutted mate - got mine booked into to Pip on the 23rd to sort it out - needs a service anyway...

Your headlight problem seems same as mine - any ideas on how we sort it? Or you just getting garage to do it?

T

[peterwolds]

Gutted mate - got mine booked into to Pip on the 23rd to sort it out - needs a service anyway...

Your headlight problem seems same as mine - any ideas on how we sort it? Or you just getting garage to do it?

T

T spoke to Damian at mot garage he will sort lights out plus  i have my old cat exhaust so will fit for mot,dont want to mess with settings on ecu an area i am loath to touch.
Question is if i decide to keep it on to save messing about will it cause any problems as has a decat on now ?

[peterwolds]

Other tricks are to throw BIO fuel (Ethanol) in the tank for the MOT test, as it burns much cleaner, and then refill the tank after the test with normal juice, and/or fit a cat into the exhaust system for the test and take it out after.
 
New plugs and a warm engine also help as the bish said.

Prof just talked to Clive he mentioned ethanol - how much in the tank to squeeze through the test ?

[Prof]

Prof just talked to Clive he mentioned ethanol - how much in the tank to squeeze through the test ?

I\'ve never tried this myself - but from what I\'ve read on threads on the rx7club, they pretty much empty the tank, put a couple of litres of ethanol in - just enough to run to the test station and back, then drive straight to a garage and top up with \'proper\' gas.  I think the idea is that the rotary will be running purely on ethanol which produces lower emissions because it oxidizes more readily to water and co2.  I should think that running no or a much more dilute premix would also need to be done just for the test.

[peterwolds]

car passed mot today with catted dunk megaphone exhaust fitted as opposed to xspower non cat that it failed on.
question - as apexi ecu was mapped with the non cat exhaust on does it need remapping as dunk still on ?