High idle and drop very slowly - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 145 (permalink) Old 10-14-2013, 09:15 AM Thread Starter
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Quote:
Originally Posted by carphoria View Post
HKFever,

Did you catch a video of it? I had a similar issue on one of my R53 Mini Cooper S (supercharged model). Turned out to be a slow boost leak in an I/C hose, just not seated correctly.

I had to correct the leak, then reset the ECU.

Maybe when replacing the throttle body you corrected boost leak somewhere else?

-JM
Here is the video Lotus Exige idle high drop slow after clean throttle body - YouTube

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post #22 of 145 (permalink) Old 11-12-2013, 02:06 AM Thread Starter
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Replaced a new throttle body, but same problem.

Can anyone help?

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post #23 of 145 (permalink) Old 11-13-2013, 04:56 AM Thread Starter
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Update, this is what we tried today:

Took out the good throttle from my firend's Exige ( his car runs perfect but his throttle is so dirty like a chimmy ) and installed my throttle in his car. After installation he has same problem as mine
- You may say the throttle body is faulty.


The interesting part is, my other friend installed Hurricane Induction kit from Elise Shop in UK in other shop. During the installation, his tech. cleaned the throttle for him. Then his Exige has the same problem as mine.


Both our cars (3 cars), can go up a 5-10 degree slope by itself without pressing the gas padel. We only need to release the clutch slowly without press the gas padel, then the car will go on by itself, keep on supplying gas or open the throttle to maintain RPM.

I just drove my car like this to 3rd floor in my parking lot LOL.

So all have same problem after installed cleaned throttle and new throttle.

Any idea

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Last edited by HKFEVER; 11-13-2013 at 05:09 AM.
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post #24 of 145 (permalink) Old 11-13-2013, 04:43 PM Thread Starter
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Any suggestion guys?

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post #25 of 145 (permalink) Old 11-13-2013, 07:37 PM
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post #26 of 145 (permalink) Old 11-13-2013, 08:48 PM
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A quick question:

Have you tapped into the Throttle Position Sensor for a data logger?
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post #27 of 145 (permalink) Old 11-14-2013, 12:17 AM Thread Starter
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Originally Posted by iana View Post
Thank you, but mine don have throttle position sensor.

Dealer won't touch my car as it has B300 mod in it.

S111 told me to do the following:
1. Reconnect the battery.
2. Just start the engine, and let it idle for more than 10 mins. Then drive off
3. After the drive the car, I have to let it idle 10 mins, before turn it off
4. Start the engine, and let it idle for more than 10 mins. Then drive off
5. After the drive the car, I have to let it idle 10 mins, before turn it off
6. Start the engine, and let it idle for more than 10 mins. Then drive off
7. After the drive the car, I have to let it idle 10 mins, before turn it off
8. Start the engine, and let it idle for more than 10 mins. Then drive off
9. After the drive the car, I have to let it idle 10 mins, before turn it off

But I doubt it.

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post #28 of 145 (permalink) Old 11-17-2013, 06:23 AM Thread Starter
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Anyone?

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post #29 of 145 (permalink) Old 11-17-2013, 06:38 AM
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As a point of reference my 2009 Elise, starts and immediately idles at 800 rpm.

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post #30 of 145 (permalink) Old 11-17-2013, 04:18 PM Thread Starter
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As a point of reference my 2009 Elise, starts and immediately idles at 800 rpm.
This was my idle (800RPM) before cleaned the throttle body.

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post #31 of 145 (permalink) Old 11-22-2013, 06:25 PM Thread Starter
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Can anyone explain the following:

1. in 1st gear, not apply gas, release clutch slowly, the car will go by itself without stall.
- A/F show rich (8.9...to 14....), the car try to maintain the idle.
- If the car almost stall, the A/F will go up to 8.9 and raise the RPM to maintain not to stall.
- the car will go up slope no problem

2. in 2nd gear, not apply gas, release clutch slowly, the car will go by itself without stall.
- A/F show rich (8.9...to 14....), the car try to maintain the idle.
- If the car almost stall, the A/F will go up to 8.9 and raise the RPM to maintain not to stall.
- the car will go up slope no problem

3. 3rd gear, same.

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Last edited by HKFEVER; 11-22-2013 at 08:07 PM.
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post #32 of 145 (permalink) Old 12-05-2013, 09:07 AM Thread Starter
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Help...

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post #33 of 145 (permalink) Old 12-05-2013, 09:22 AM
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HKFEVER,
It seems like people ARE trying to help👍
There have been some good suggestions. I would have thought vacuum, throttle position sensor, or a fuel pressure issue.
I had a supercharged Miata that would stumble then go like mad at around 3,000rpm.
I tried many things, but finally adjusted the fuel pressure regulator and the problem vanished.
Have you tried contacting Phil?


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post #34 of 145 (permalink) Old 12-05-2013, 12:34 PM
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Without proper diagnostics, there's not much to say other than to just throw parts at it or buy the right tools for proper diagnostics....

Try the TPS or a new TB I guess. Yes, there is a TPS in the TB of DBW cars. See ift he DBW "three screws" are tight... You can try new speed wheel sensors. the car has a rolling idle speed adjustment. Maybe it's getting bad data. Try a new ABS unit. Try a new wiring harness. Try a new pedal position sensor.

You see, it can be anything. Get/borrow a Lotus tech center. It would be cheaper than replacing all that stuff and see what the readings are of all the respective sensors. This is not that hard, you just need data.

-Phil


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post #35 of 145 (permalink) Old 12-05-2013, 12:59 PM
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I think it sounds like you have an air leak in the manifold. Your friend's dirty throttle body works because it restricts the air flow further than a new clean throttle body. The slow dropping idle sounds like the ECU is trying to compensate for the air leak, but it can't close the butterfly enough to bring the idle to normal.

You can try spraying starting fluid near the gaskets of the super charger and the intake manifold to see if the revs increase. Then you will know if you have a leak.

I have seen a few intake manifold studs break due to the supercharger belt tension pulling on the opposite side.

I would start there.

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post #36 of 145 (permalink) Old 12-05-2013, 01:07 PM
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I think it sounds like you have an air leak in the manifold. Your friend's dirty throttle body works because it restricts the air flow further than a new clean throttle body. The slow dropping idle sounds like the ECU is trying to compensate for the air leak, but it can't close the butterfly enough to bring the idle to normal.

You can try spraying starting fluid near the gaskets of the super charger and the intake manifold to see if the revs increase. Then you will know if you have a leak.

I have seen a few intake manifold studs break due to the supercharger belt tension pulling on the opposite side.

I would start there.
Surely he has checked for vac leaks, removed catch cans, closed PCV off, etc?!?!?!! If not, then followed by


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post #37 of 145 (permalink) Old 12-05-2013, 01:16 PM
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I'm a novice, but maybe the ECU needs to relearn how it should work now that the throttle body is clean? That would require a reset
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post #38 of 145 (permalink) Old 12-05-2013, 01:43 PM
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Originally Posted by HKFEVER View Post
This morning a ex Lotus certified tech drop by my home and tried to help out. The following is what we did:

1. Check out all the vacuum hoses.
2. Disconnect the battery, to re-set the throttle plate.
3. Cold start the engine:
- Right after engine start, I heard loud heas heas sound near the engine front left area. The tech hear it too, can't figure out where it came from.
4. Shut down the engine and restart the engine, the sound gone.
5. Check all the vacuum hoses again.
6. Start the engine, closed out the vacuum line that provide more air when A/C on. No different with open or close the hose.
7. Double check all the hoses again. Nothing wrong.
8. Drive for normal drive 15 min. The problem remain.

The tech suggest to change the Multi Relay Unit under the ECU. He mentioned that unit has effect on ECU control the A/C idle.

Huhhhhh, any comment.
#3 hiss near front left of engine, which is close to far side of manifold from supercharger belt... Reminds me of a certain broken manifold bolt and air leak that caused a loud hiss on a supercharged Elise.

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post #39 of 145 (permalink) Old 12-05-2013, 05:03 PM Thread Starter
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Originally Posted by turbophil View Post
Surely he has checked for vac leaks, removed catch cans, closed PCV off, etc?!?!?!! If not, then followed by
Checked for vac leaks, removed catch cans, closed PCV off... Tried them all.

Did not try leak check on the manifold.

But then why my firend's car has the same problem with my old throttle?

S240 Exige S with BOE FW300 + over 40 mods

Last edited by HKFEVER; 12-05-2013 at 05:47 PM.
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post #40 of 145 (permalink) Old 12-05-2013, 05:49 PM Thread Starter
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Originally Posted by turbophil View Post
Without proper diagnostics, there's not much to say other than to just throw parts at it or buy the right tools for proper diagnostics....

Try the TPS or a new TB I guess. Yes, there is a TPS in the TB of DBW cars. See ift he DBW "three screws" are tight... You can try new speed wheel sensors. the car has a rolling idle speed adjustment. Maybe it's getting bad data. Try a new ABS unit. Try a new wiring harness. Try a new pedal position sensor.

You see, it can be anything. Get/borrow a Lotus tech center. It would be cheaper than replacing all that stuff and see what the readings are of all the respective sensors. This is not that hard, you just need data.

-Phil

Thank you for your advise. but Local dealer won't touch my car as I have a B300 in it.

If I could get the Lotus tech center in anyway. What data should I looking for?

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