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Ve ssv high idle after MAF/TB clean

monstar

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So ive uploaded a a short clip of what my car is doing. The car runs ok and idles fine when statinary but when in neutral and rolling or when you come to a stop itll rev high. Once you stop moving it returns to normal..in the clip im rolling down the road in neutral at 40ks and the revs are up and down. Sometimes it just sits at 2000rpm and other times it does this..itll kepp doing that until you put it in gear or come to a stop
just log the throttle position, rpm and max frequency while you go for a drive please. will show whats up.
im up in briso this weekend btw
 

Seanssv08

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just log the throttle position, rpm and max frequency while you go for a drive please. will show whats up.
im up in briso this weekend btw
Throttle positon while this is happpening is between 10 &13%. The rpm is between 1000&2000, Sometimes sticks on 2000..What do u mean by max frequency?
 

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Anyone have any ideas? Not keen on taking it to a mechanic for another day to pay a fortune and no fix....
 

RiCeY

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Got a any mates with VE V8's? Try another throttle body. Have seen this issue before where the TB can't find it's idle position after a clean, yet to work out what the actual issue is.
 

RiCeY

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Service Bay/On Road Idle Learn Procedure – Performed after the ECM is programmed or replaced



  1. Note: Do NOT perform this procedure if any DTCs are set.
  2. Engine idling for 3 min.
  3. The ECM will start to learn the new idle cells and the scan tool Desired Idle Speed should start to decrease.
  4. Ignition OFF for 60 s.
  5. Start and idle the engine for 3 min.
  6. Verify the engine is idling normally.
    • If the engine idle is not correct

    1. Note: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
    2. Operate the vehicle at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
    3. Verify the engine is idling normally.
      • If the engine idle is not correct.
        Ignition OFF for 60 s, repeat step 5.1.
 

Seanssv08

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Got a any mates with VE V8's? Try another throttle body. Have seen this issue before where the TB can't find it's idle position after a clean, yet to work out what the actual issue is.
Nah cant getmy hands on one. My mechanic took it all apart again and checked it. Said it looked fine..
 

dgp

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Sean, did you ever get this resolved? I’m having the same issue with my LS3 Redline.
 

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GM had issues with throttle bodies on 2009 3.6 ltr engines and extended the warranty on this component to 10 years.

Also, some other engines had issues with electrical contact points of the metallic fingers within the throttle position sensor itself which caused all sorts of idle and power issues. Likely not related to V8’s but interesting in any case, see below
 

dgp

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Thanks Skylarking, an interesting video.

Unfortunately my issue remains, my engine idle is hanging up and fluctuating between approximately 1,000rpm and 1,800rpm when I shift into neutral (M6) while coasting down from any speed until I come to a complete stop, then the idle settles back to normal quite quickly (650rpm).

This issue began after I cleaned my K&N filter and wiped out the throttle body with a clean rag and throttle body cleaner.
I have tried the idle relearn procedure several times, and a couple of variations.

Idle car for 3 minutes
Turn off for 1 minute
Idle car for 3 minutes then drive

Idle car for 10 minutes, A/C on
Leave car on, idle car for a further 10 minutes, A/C off
Turn car off for a few minutes then restart and drive.

I have also tried driving above 70km/h with multiple deceleration events, coming to a complete stop and waiting for the idle to settle, waiting 3 minutes before moving off again (both with engine still going and engine off for several minutes then restarting and driving off)

A little stumped right now.

I also checked my injectors (when I did the filter change) for the correct Ohm reading (12.5-12.7).

Possibilities could be
- I have damaged an O ring on an injector when I unplugged them creating an unmetered air leak
- I put too much oil on the filter causing the MAF to read incorrectly (doubtful I think)
- I have damaged the TB blade mechanism or the Air Intake Sensor in the TB

Next step right now
- drop another tune in and see if that makes any difference
- disconnect battery for 30 minutes to see if the PCM forgets the idle setting completely and start the relearn again
- pull out the MAF and intake again to see if there is anything obvious that is out of place.

Happy to take other thoughts if anyone has also experienced this issue.
 

07GTS

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check the high idle with a tuner and they will be able to see if idle is high because TB is open more or if it's where it should be but is trying to lower it and it can't, that will tell u if it's an air leak or other issue to look at
 

dgp

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Thanks for the reply 07, I have a FlashscanV2 (just not that knowledgeable with it), so if I log the ETCTP and idle, and see the throttle % remain constant but the idle fluctuate, would this then point to a problem with something other than the TB?

Should the throttle % be between 6%-12% on idle?
 

07GTS

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if u can see all the idle airflow and idle spark corrections have a look at what is doing, idle ECT should be about the 6-12% depending on mods, because it's higher rpm it should be in error correcton especially with spark reduction and the airflow should show what it's expecting idle to be and what it is so u will see the error, usually if u have an airleak ECT will be very low % did u reset the TB trims before the relearn ?
 

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No I didn’t reset the TB trims, how do I do that?
 

07GTS

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ok yea is best to reset them before the learn so it makes the adjustments quicker, im not sure bout efilive but the hpt has a reset u can apply so u can then do the relearn
 

dgp

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Well I tried another couple of options,
- unplugging TB, turning car on, not starting, plugging back in then starting
- pulling fuse for ECM, turning car on, not starting, waiting a few minutes then reinserting fuse and starting
No joy.

Found a post on EFI LIVE Forum which pointed me to the idle learn reset function in the software while plugged into the car(pass through). This seems to have resolved my issue. Idle is no longer hanging up on coast down. Yay.
 
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