by "Cé hé sin" (michael-m-mouse)
Published 08/23/2017 at 16:57
by "Cé hé sin" (michael-m-mouse)
Published 08/23/2017 at 16:57
Tags: Mitsubishi
; FTO
; emissions
STARS: 0
24th July test: CO emissions at high idle: 0.35% (limit 0.3%), lambda 0.99 (range allowed 0.97 to 1.03)
22nd August: bought new cat, had fitted
23rd August test: CO emissions 0.41%, lambda now 1.28. In previous attempts CO was at about 0.6 but the lambda was OK, but suddenly the lambda went out of range and the CO fell a bit.
Makes no sense to me.
"BvdV - The Dutch Engineer" (dutchengineer)
08/23/2017 at 17:01, STARS: 0
Sounds like it could be running a bit too rich. Have the lambda sensors been plugged in correctly after replacing the cat?
"Cé hé sin" (michael-m-mouse)
08/23/2017 at 17:40, STARS: 0
That’s what I thought of too, but the test centre did five or six attempts and it was only the last one where the lambda was wrong. The sensor was changed about three years ago just in case.
"BvdV - The Dutch Engineer" (dutchengineer)
08/23/2017 at 17:58, STARS: 0
Hmm, odd. Is it a known issue for the FTO to have problems with CO/Lambda values?
"Cé hé sin" (michael-m-mouse)
08/23/2017 at 18:22, STARS: 1
There’s little on forums about any specific issues, but emissions are always going to be a problem with an old car. I’m going to look at any diagnosis codes that I can see - the car has an OBD1 diagnostic socket (not the modern OBD2 one) which needs a special diagnostic unit, or instead you have to joint two connectors together and see how often the engine warning light flashes. So, for example, two long flashes and three short ones are Code 23 which is I think crank position sensor and so on.
"brianbrannon" (brianbrannon)
08/23/2017 at 19:04, STARS: 0
If all you changed was the converter and it got worse. Then you probably got a shit converter. Also easy to damage the O2 sensor when changing the converter. The cheap ones don’t tend to work well. The lamda should be a constantly changing number, how are they measuring it?
"BvdV - The Dutch Engineer" (dutchengineer)
08/24/2017 at 02:40, STARS: 0
Ah I see, that does make finding the problem quite a bit more of a hassle. Good luck!