leecharlton

Hi I have a little prob with my bugeye the car is runnin 310bhp with mods and a remap all been on the rolling road and everything is ok and safe but i have a problem when car has been runnin when i leave it for 5 mins then get back in it it takes a while to fire up sometimes arounds 5 seconds plus to fire always starts but seems not right the only thing which it hasnt is a heat sensor in the up pipe this has been unplug as its broken could this be the problem it has both lambda sensors connect has any one got any ideas as it seems to be getting worst

JonMc

iTrader: (51)

It is a common problem according to my mapper. There is no scaling for the fuelling on start-up in terms of cold and hot start. To get a good hot start it would have to be set to run very rich when cold, but that is the fix apparently.

sc_sjo

iTrader: (7)

Did it do this before it was modified/remapped? If not then go back to your mapper, or find a better one if he/she can't fix it!

JonMc

iTrader: (51)

Mine was exactly the same before, if not slightly worse. I did replace the front O2 sensor when I decatted the car as it was throwing a fault code during spirited runs, and that has now cleared.

sc_sjo

iTrader: (7)

I'm not familiar with the strategies in the OEM ECU but i'd be very surprised if Subaru let it out the door with hot start problems. Saying that, my classic takes longer to fire upon cranking when hot than cold, but I have other not-yet-diagnosed issues which could be causing it.

Splitpin

While I can believe that's true, as my general belief is that the 16 bit ECUs are a little rudimentary in places, I would be amazed if there is absolutely no cold start compensation at all, purely on the basis that there is a very intricate system on the 99-00 cars, and if they have it, it follows that there should be at least something on the newer units.

dynamix

iTrader: (3)

Sorry but this isnt true (unless EcuTek doesnt have access to those tables). There is a very full and comprehensive cold/warm start 2D tables that plots coolant temperature against additional fueling required. There is no need to accept less than perfect starting in all temp states from the OE ecu.

Splitpin

Thought so. If it can be done on the earlier cars, it's bizarre to contend that it isn't possible on later ones.

dynamix

iTrader: (3)

I cant believe that ecutek doesnt have this ability either.

Splitpin

Quite, sounds more like "mapper" not knowing what's possible than the alternative.

Jolly Green Monster

iTrader: (4)

avaiable in ecutek too.

if issue was there before remap, then perhaps crank and cam sensors worn..

Simon

dynamix

iTrader: (3)

thought so Simon, couldnt believe it wouldnt be there.

Good point on crank/cam sensors.