High idle and drop very slowly - Page 8 - LotusTalk - The Lotus Cars Community
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post #141 of 145 (permalink) Old 11-25-2016, 03:06 AM
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I had an issue with rough acceleration that I thought was engine related. It turned out to be the suspension.

So what if your issue is not directly related to the idle? I'm just throwing the idea out there since you have tried everything else.

For example maybe the engine revs are perfect but the tach displays the wrong data until it has warmed up.

Or maybe all the sensors are perfect but the wiring has a bad ground.

I don't know, but I do feel sorry for you. It is frustrating to see other cars working fine when yours has an issue.

2009 Saffron Elise
1986 Toyota Tercel - RIP Oct 20/2012
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post #142 of 145 (permalink) Old 11-26-2016, 12:55 PM
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Originally Posted by HKFEVER View Post
- I saw a lots of Lotus and Toyota have the same issue
- Visited Lotus dealer for lots of time, can't figure out.
- Changed so many things, can't fix it.
- Checked all the leak, can't fix it.
- Checked and replaced gaskets for the whole intake, can't fix it.
- Changed to stock ECU, Setcor 111 B300 ECU, BOE ECU, can't fix it.
- Changed loom and spark plugs, can't fix it.
- Changed and check all the gasket from header to muffler, can't fix it.
- Changed MAF, 2 X O2 sensors, can't fit it.
- Changed and check intake temp. sensor, can't fix it.
- Changed throttle body, can't fit it.
- Disconnect catch can, can't fit it.
- Changed paddle sensor, can't fit it.

Wheel speed sensor?
Someone suggested it may be the vacuum bypass valve on the supercharger. The diaphragm might be faulty or the spring may not allow the valve to return. Something I'm going to check next when I have a chance as mine is a real pain to get to.
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post #143 of 145 (permalink) Old 11-27-2016, 08:06 PM
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Something else that might be related, that I noticed today after driving with a high idle condition.

Idle was behaving until this afternoon. Then was doing the now usual high idle while stopped at lights etc and slow return when revved. Got home and had poke at the Vacuum Bypass valve on the supercharger. didn't do anything. Turned the car off and it had the usual Ethrottle body electrical whine, but I noticed the whine wouldn't turn off for several minutes. It normally stops whining after a few seconds after the car is turned off.

This makes me think it's the flashed ECU doing something weird. If the EThrottle was faulty I would assume it would consistently idle high. But it's intermittent.

HKFEVER, how have you put up with this for so many years? I'm seriously thinking about just selling mine. haha.
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post #144 of 145 (permalink) Old 02-08-2017, 01:04 AM
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Just an update. I've had a stand alone aftermarket ECU wired in and my idle and slow return issues are now a thing of the past. It's been solid for the past month. Guess my old ECU wasn't flash tuned properly by Sector 111. I would have had them look at it if I was based in the State, however I wanted someone local here in NZ to sort it.

If you ever work out what is causing your issue, let us know.
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post #145 of 145 (permalink) Old 06-23-2017, 07:29 AM
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Did you find a solution to this?
My car is having a rpm hang up as well. I have the EFI ecu and wondering if its parts in the car causing this or ecu. I did just about what folks posted and everything is a ok. Anybody fixed this issue except changing to aftermarket ecu?

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