Patches Posted April 26, 2014 Share Posted April 26, 2014 (edited) My car starts as it should when cold but if i drive for a while then start it within the next hour or so it will idle a bit rough. Nothing too bad but noticable and the AFR car be between 17-19 :/If i tap the throttle it comes right down and once i get moving for a bit it will slowly get back to normal. Its really strange if i sit with the engine running and let it get hot it never seems to go past 15.5 so im confused why it happens on warm starts.Any ideas? Edited April 26, 2014 by Patches Quote Link to post Share on other sites
AdamB Posted April 26, 2014 Share Posted April 26, 2014 What ecu are you using mate? Quote Link to post Share on other sites
brendonware Posted April 26, 2014 Share Posted April 26, 2014 Mine does exactly the same, but probably worse, I can start it first time but if I turn it off and try and start it again it doesn't start or it does the lean and rough idle as you described. I'm running emanage blue by the way.Brendon Quote Link to post Share on other sites
TurboTobz Posted April 26, 2014 Share Posted April 26, 2014 I uses to have this but I swapped my fse rrfpr for a new sard unit and it didn't ever fail me. May have be coincidental. Quote Link to post Share on other sites
brendonware Posted April 26, 2014 Share Posted April 26, 2014 I borrowed a mate's one and I thought it fixed it but a day later it was back to its usual self so swapped it back :/ might have to buy a new one as I think the one I bought from someone is a copy :/ Brendon Quote Link to post Share on other sites
mikey4410 Posted April 26, 2014 Share Posted April 26, 2014 they do rarely pop up to 16.8 ish. normal. and most importantly not an issue whatsoever.WOT is what u wana worry about.lol. idles feck at to worry bout Quote Link to post Share on other sites
GP82 Posted April 27, 2014 Share Posted April 27, 2014 I run 16 + A/F on idle at operating temp. It actually burns more cleaner, aswell as being more fuel efficient. Any leaner then 17:1 A/F and it tends to eventually decrease the idle speed or cut out. If you don't have a catalytic convertor then it is fine to run this lean on idle. The car will run stoich (14.7:1) on the stock ecu so the cat does not overheat from the hotter exhaust gasses. It sound's like maybe possibly a sensor is starting to go duff causing this issue on your car, but as mentioned, the A/F is more crucial when the car is on load. Quote Link to post Share on other sites
JayJ Posted April 27, 2014 Share Posted April 27, 2014 I'm currently running a stock ecu and got this issue too. Could it be water temp sensor playing or what? Quote Link to post Share on other sites
brendonware Posted April 27, 2014 Share Posted April 27, 2014 I changed mine water temp sensor and for me, it was no use Brendon Quote Link to post Share on other sites
JayJ Posted April 27, 2014 Share Posted April 27, 2014 Good to know, have to check the FPR then. Quote Link to post Share on other sites
mech5107 Posted April 27, 2014 Share Posted April 27, 2014 It's due to the stock lamda sensor not getting up to temp after the restart. If you drive more gases are produced so the sensor gets up to temp. Quote Link to post Share on other sites
JayJ Posted April 27, 2014 Share Posted April 27, 2014 It's due to the stock lamda sensor not getting up to temp after the restart. If you drive more gases are produced so the sensor gets up to temp. So would a new lambda help as mine just started doing this some time ago? Quote Link to post Share on other sites
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