robvmarr Posted August 14, 2015 Share Posted August 14, 2015 K Series 1800 with Emerald K3 ECU with a cough/splutter when dabbing the throttle coming down in speed/changing gear, but not changing/going in speed or under full load. Told maybe the throttle sensors or coil pack, do you agree and if so are they difficult to sort or do you have any other ideas? Thanks. Link to comment Share on other sites More sharing options...
prangerman Posted August 14, 2015 Share Posted August 14, 2015 I've had a similar problem with my R300K which I've sorted by resetting the TPS. A fiddly but ultimately a straightforward job which even I can do. Peter Link to comment Share on other sites More sharing options...
Phil G Posted August 14, 2015 Share Posted August 14, 2015 I’ve been having a similar problem recently with the addition of a misfire an ensuing belch from the exhaust. It is also a K Series 1800 with Emerald K3 ECU on Caterham TBs and I suspect it is heat related, however, those that I have consulted are not convinced.Both TPS and coil pack have been suggested as a possible cause, along with a dodgy temperature sensor to ECU. TPS adjusted and TBs balanced by Andy at PGM, plus I have changed the sensor along with plugs & leads and it appears to behaving itself.....why did I say that....! Link to comment Share on other sites More sharing options...
Mr Locust Posted August 14, 2015 Share Posted August 14, 2015 To clarify: Is this after a period of overrun at relatively high rpm? Link to comment Share on other sites More sharing options...
ben7 Posted August 16, 2015 Share Posted August 16, 2015 Is it more wet splutter than dry cough? So are you steady in say, 4th gear, freewheel downshift to 3rd and blip throttle with the clutch in to match revs? If so, when you blip the throttle do the revs not rise much and it splutters?Or when you're heal and toeing? Or as Mr L says, are you accelerating hard, lift off then put your foot in again and it splutters? It 'sounds like' it could be running rich. Why it is running rich could be down to a multitude of things, including the TPS being out (you could be in the wrong load/speed site for example) or as I think Mr L could be suggesting, the 'overrun cut off' setting in the map.I would have thought that a coil pack/lead issue would cause the engine to hesitate or as Phil G says, misfire. That feels different to the splutter. That's more you put your foot in and the car hesitates (it actually feels like it's slowing down), then catches up again. It feels horrible and as if the engine is breaking (as well as braking).Can you plug your laptop into the ecu? If so then you can start to work through what it might be. Link to comment Share on other sites More sharing options...
Mr Locust Posted August 17, 2015 Share Posted August 17, 2015 It is worth disabling the overrun fuel cut setting as it is a simple, "no parts" test to eliminate it as a possible cause of the issue (provided that you are confident in reprogramming the ECU).Depending on map settings and driving style, this setup can be prone to a lean misfire on resumption of fuelling after a prolonged overrun fuel cut event. Link to comment Share on other sites More sharing options...
robvmarr Posted August 20, 2015 Author Share Posted August 20, 2015 Thanks for all your replies.I have had Emerald take a look at my maps and seemingly the settings (from the previous owner) were all over the show.They have re-mapped all three maps and the cough/splutter seems to be cured.Good news and with no components needing to be bought....whoopee!A big thank you goes to Emerald who connected to my cars ECU remotely over 200 miles away! Link to comment Share on other sites More sharing options...
ben7 Posted August 21, 2015 Share Posted August 21, 2015 Great news that you got it sorted. I know from my recent dealings with Emerald that they really are a first class company and always go above and beyond Link to comment Share on other sites More sharing options...
Budjuggler Posted August 21, 2015 Share Posted August 21, 2015 Agreed about Emerald. Had a cold start issue (Toyota 1.8), e mailed the map, received it back by return and it starts on the button! Great service! Link to comment Share on other sites More sharing options...
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