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1999 lotus v8 esprit. dosent idle correctly hot or cold, after a blast up the road it will stay reving at 2500rpm untill switched off and re started. If you disconect the IAC valve it runs on base idle and is ok hot and cold. no fault codes, scoped all available live data through EOBD and all is well. Something telling the IAC valve incorrect data? No air leaks that I can find any help other than a box of matches? cheers
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I do not know your vehicle but in that time frame a lot of cars used what is called a ballast resistor. During start it was shorted allowing the coil to output more power, once the engine came up to speed about two seconds the short was removed. Shorting simply means bypassing the resistor. I hope that helps.
US models such as my 1991 Lotus Esprit SE is to the left of the steering column at the bottom of the dash. Reach down and feel behind the dash there will be a rectangular pull or pivot which releases the hood.
the se esprits the s4 and s4s series are programmed to speed up engine rpm and close off the exhaust back pressure valve to speed up the heating of the catalytic converter to operating temperature and is quite normal regardless of engine temp. if you quickly blip the throttle pedal a few times it should settle as the cat temp rises if that is the case then it is all working as normal.
What year is the esprit? is the noise audible with the engine running car in neutral and stationary if so and it goes with you foot on the pedal it is the release bearing, this is common and often caused by incorrect adjustment on the clutch fork the correct setting is in the workshop manual.
A new idle air valve has been fitted already and has made no differance.
The valve is probably sticking, take it out and clean it with aerosol carb cleaner. If it fixes it and then happens again, replace it.
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