My car stalled the other day when pulling up to a junction , its only done this a couple of times and to be honest not an issue but just wondered if there is any hints or tips
Reading on this form and others I know there is an software update that is meant to help this , problem being my car isn’t standard . I believe it has a Charlie X map on it done by Essex Autosport years ago.
I plan on checking the plugs as it is fairly lupy at idle, but no misfires.
Also plan on inspecting / cleaning the throttle body
oh, the solution to the idle issue was to raise the idle from like 800 to 1000, so as the revs dip coming to a stop they dip from 1000 but not enough to stall it
It is not poor mapping, this was an inherent problem with the SC S2, to try to make emissions they lean off the fuelling at idle when you pull up the revs are allowed to drop to far with it lean and the idle valve fails to add enough air to keep the car idling hence the stall, when maps are redone, they only map for full\near full throttle, everything else (part throttle) is dealt with via long\short term fuel trims.
This is why cleaning the air filter and throttle body can fix the problem, if you can get someone to up the idle on the ECU it should resolve it.
Yip I was watching the fuel trims trying to cope yesterday at idle with my scanner plugged in they just can’t always react quick enough to control it. I haven’t had an AFR gauge on it yet but did think it would be too lean as on cold start the idle is fine .
option 3 will bring a new world of pain, I was talking to a local guy who is looking to buy my old carbon parts, he was telling me his woes and wishes he never put on the syvecs, as good as it is for peak power etc, the poor starting when warm or cold drives him mad, he has taken it back so many times and it is getting better, but not right.
I used to clean the filter on mine all the time, that seemed to stop it most of the time, I know Lee who bought my car emptied a can of carb cleaner into the throttle body and now it is behaving very well. maybe PM him nitro on here.
Im pretty sure it is the mapping… It was one of the first (may even be the first in the UK) cars to be running 300bhp back in the 2008/9.
The positive side to this is the map has proven to be reliable, but I think the mapping back then was just case of taking a 260 map and coding it to dump more fuel into it. At a guess I would say its over fuelling at idle (might be worth sticking a AFR gauge on it).
My car is also mapped with the CharlieX/Gotham/Essex Autosport map , i had exactly the same engine idle problems , after chasing the fault round the car replacing expensive sensors and taking the car back to EA twice with no joy or explanation i decided to clean the TB with the BG TB cleaner , it was an instant fix and i have had no issues since.
Just make sure you use a quality TB cleaner like BG that won’t damage the special coating inside the TB .
Mine was the first UK 300hp car, it was never a 260hp map added to, the ECU on my old car is still the same ECU it came with and never has it had a 260hp Lotus map put on it.
Mine had about 2 days of dyno time working on the full throttle elements each time an upgrade was done, those were the base maps then used by EA for all the other cars.
I talked at length with the tuner and the value adjustments done to work with the bigger injectors were across the board on the underlying map, the cars have 2 maps, closed loop and open loop, one is full throttle and is fixed and the other is the general day to day part throttle. I can never remember which way round they are
However just about all the work was done to get a consistent safe full throttle map, next to no changes are made to the part throttle map and it it an underlying Lotus map issue, mine even did it as a standard 220hp car with no mods, I was told by the dealer TADTS
Thnks Moomin I’ve ordered some BG cleaner so will give that a try , when changing the filter i did check the body and the throttle plate was actually very clean already.
