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Old 12-01-2020, 20:06   #1
Grunter76
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Annoying idle

So my 7 has 1 annoying issue im struggling to live with...... Idle is fine rev it stationery and it drops back to base idle fine. However start driving change gear hey presto 2k revs. Pull up at junction 2k tickover. Rev it and it still rests at 2k. Park up and still 2k but slowly it wil drop back down to where it should be. Any ideas or cures. Im 99%certain its not an air leak

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Old 13-01-2020, 10:59   #2
McGoo60
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Mine had similar symptoms and I fitted a new ISCV which didn't cure it and it turned out to be an ECU fault with the ISCV control.
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Old 13-01-2020, 14:59   #3
r3k1355
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I'd start with the idle speed control valve.
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Old 13-01-2020, 17:02   #4
Grunter76
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I was thinking that...... But in my case its never the simple things

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Old 13-01-2020, 22:33   #5
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Does it only do it when fully at temp? Ie have you driven the car. Stopped it and restarted it when got to see what happens.

I had loads of problems with hunting on idle but only when warm, fine when cold.

Changed all pipe work in case a leak still same, no idle valve and still the same. Changed throttle seals and still the same.

In the end changed the throttle body and maf, not sure what resolved but it did, so might be worth a look, or see if anyone local can swap a known working maf just for a check
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Old 13-01-2020, 23:00   #6
Grunter76
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I havnt tried it at cold to be fair mate by time i get it off the drive its warm. Will have a crack at the weekend

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Old 14-01-2020, 08:47   #7
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Would it be worth hooking up something like a Tactrix cable to monitor the throttle position while the engine is idling normally or at an elevated level? But what I have no idea about is whether the TP position is inclusive or independent of what the ISCV is doing?
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Old 14-01-2020, 09:35   #8
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Plip tactrix cable?? Thats a new one to me lol. Ill try anything to cure it as its really annoying lol

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Old 14-01-2020, 10:17   #9
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Plip tactrix cable?? Thats a new one to me lol. Ill try anything to cure it as its really annoying lol

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Plip is talking about the EvoScan software to monitor the ECU. However could also measure the TPS voltage and ensure its within limits when off the throttle. There will likley be an idle control "hold off" that depends on throttle position and I had this same issue on mine (albeit with ViPec ECU) where is was sitting high just on the threshold and would eventually drop enough for idle control to become active.

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Old 14-01-2020, 11:17   #10
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Plip tactrix cable?? Thats a new one to me lol. Ill try anything to cure it as its really annoying lol

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https://www.tactrix.com/index.php?op...ed=1&Itemid=53
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Old 14-01-2020, 12:33   #11
Grunter76
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Plip is talking about the EvoScan software to monitor the ECU. However could also measure the TPS voltage and ensure its within limits when off the throttle. There will likley be an idle control "hold off" that depends on throttle position and I had this same issue on mine (albeit with ViPec ECU) where is was sitting high just on the threshold and would eventually drop enough for idle control to become active.
That seems to sound exactly like whats happening with mine. If it is will it just be a tps adjustment or will i have to book it in

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Old 14-01-2020, 15:23   #12
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That seems to sound exactly like whats happening with mine. If it is will it just be a tps adjustment or will i have to book it in

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I was able to re-calibrate mine which has been OK since. There is a procedure in the manual to adjust the zero point by rotating the TPS so would be worth trying that before changing the TPS.
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Old 14-01-2020, 15:59   #13
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I was able to re-calibrate mine which has been OK since. There is a procedure in the manual to adjust the zero point by rotating the TPS so would be worth trying that before changing the TPS.
Cheers dude ill give that ago. Next question where can i get a manual lol

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Old 14-01-2020, 16:12   #14
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I'd recommend you join this forum and you can then download tons of info incluidng full maintenace manuals

In the mean time:

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Old 14-01-2020, 16:14   #15
Grunter76
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I'd recommend you join this forum and you can then download tons of info incluidng full maintenace manuals



In the mean time:



Cheers dude appreciate that. I will join up soon as my bank account has recovered lol

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