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Discussion Starter #1 (Edited)
So I finally got home with my '05 Elise yesterday after quite a long roadtrip. I'm really enjoying it so far, except for one thing that I was indeed warned about before I bought the car.

It has a really weird idling issue. The car does have a "custom" intake which is basically the same exact thing an "aftermarket" intake would be. An intake is an intake - some piping and a filter, plus a spot for the MAF. Apparently this idle issue is due to the intake, but who knows. Thats why I figured I would try an ask you guys here. I did indeed search, and couldn't find anything related to my paticular problem other than some guys having idling issues in stock form.

Basically, when I am coming to a stop from basically any gear/speed (the higher the speed at which I am stopping, the worse the problem is), the engine tries to die when I depress the clutch and put it into neutral, and begin braking. It sounds like the engine is "cammed" as it chugs, chugs, chugs, blurps, and tries to stay on. During this time, the head and tail lights are dimming relative to the extent of which the engine's RPM is lowering to in each of its burps and blips. Sometimes, in what seems to be totally random, the engine will indeed die completely if I don't blip the throttle. Other times it will be fine eventually after evening out, and it won't die. During the time that it is struggling to stay running, I can hear the Idle Air Control Valve trying to keep the idle on an even keel (I can hear the wooshing/sucking noise through the intake). Even when it DOES even out though, the engine still idles at what seems to be a rather high 1500-1800rpm. I know this is high, considering the manual says idle RPM should be no more than about 850rpm.

So what do you guys think is going on here? The previous owner said the car sat for almost 4 weeks, and he had to jump-start the battery to get it to crank, because apparently the "storage" life of these Lotus batteries suck. Do you think the battery has anything to do with the horribly abnormal idle and chugging/burping? Other than this weird issue, the car is mechanically perfect, and it runs and drives fine under throttle.

I'd appreciate any help, and I apologize in advance for being a noob.
 

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if the idle is that high, theres something wrong, check the set screw on the throttle cable, if its open too far it won't be able to override it.
other things to check are vacuum leaks, latest version of the ecu software.
 

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The 05s stalling at a stop is almost always a throtle cable adjustment.

How does the engine run? Is it performing well other than the rough stalling idle? I recently had an issue with two coils and plugs being fouled because of water. This is also a relatively common issue because of how water drains off the engine. (only to the left--driver's side) So it needs to lean a bit left to drain wash water or rain water.
 

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Mine didn't for the longest time, maybe 150 miles or so. Just rough idle, rough acceleration at times, then it would be fine. Finally it went big time, flashing CEL, limp mode, the whole thing. Fortunately I was only a few miles away from home and the dealer.
 

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Discussion Starter #6
No CEL at all, and the car runs perfectly other than the idle problem. Throttle performance is totally stellar besides the nasty idle and die-attempts coming to a stop.

When I check my throttle cable, what do I look for, and what kind of adjustment should I make? Sorry for the newbishness, most of my experience comes from my STi, which was electronic throttle.
 

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Discussion Starter #7
Called Sports and Specialist Cars for an appointment to bring it in next week under warranty. The service manager Jim thinks it is a software (ECU) issue. Hopefully he'll be able to address the problem. The car has the latest ECU update, though, so I don't know.

Any other ideas guys? Remember the car has the Top Speed intake pipe with the K&N filter, so I think the larger-than-stock diameter of the pipe might be contributing. Do you think I'd see less issues with a different intake like a Fujita, or maybe I should get the PES chip, which is apparently a good fix for intake idle issues.
 

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Called Sports and Specialist Cars for an appointment to bring it in next week under warranty. The service manager Jim thinks it is a software (ECU) issue. Hopefully he'll be able to address the problem. The car has the latest ECU update, though, so I don't know.

Any other ideas guys? Remember the car has the Top Speed intake pipe with the K&N filter, so I think the larger-than-stock diameter of the pipe might be contributing. Do you think I'd see less issues with a different intake like a Fujita, or maybe I should get the PES chip, which is apparently a good fix for intake idle issues.
+1. That fixed it for me, along with a moderate throttle response issue. i was running a software package 2 or 3 versions behind at the time :shrug:
 

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Discussion Starter #10
I can't see an ecu reflash solving the 1500 RPM idle, maybe the stall on stops.
Yeah thats pretty much what I was thinking. The high resting idle can't possibly be fixed purely within the ECU. Something like that has got to be the idle set screw on the throttle cable quadrant.

Anybody have a stock airbox they want to sell me? lol.
 
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