G60 idle - Can't get it right.

[P3rks 11]

I'm struggling to get a correct idle on my G60.

 

I followed the correct procedure. Timing is spot on, CO seems correct. But the idle fluctuates.

 

One day it'll idle at 800rpm, another day it'll idle at 1100rpm. And it always fluctuates no matter what.

 

I've tried 3 different ISV's, none buzz though, they all click? These are known working ISV's too!? Idea's?

 

Also, how do I test the idle switch on the throttle body? Is it like on the MK2 GTi where I can rev it to 2k ish, press the switch and see if the revs drop?

[Yandards 0]

Have you unplugged the blue temp sensor prior to starting the set-up procedure? You will also need to remove the oil breather pipe that comes off the rocker cover into the boost return line.

 

Timing is 4-8 deg BTDC as 2000-2500 rpm so I aim for 6 deg BTDC at 2250rpm.

 

You then set the CO to 0.8% IIRC and finally adjust the idle to 800rpm + 50rpm at the end.

 

If its still no good then it is likely to be a sticking ISV (G60 specific item so make sure you have a 037 prefix item).

 

Idle switch works the same as the mk 2 item.

 

An irratic idle could also be caused by an air leak or the hose from the throttle body to the ECU (needs to be exactly 1m in length and the correct VAG stuff), but I would go with a sticking ISV as your issue.

[P3rks 11]

Have you unplugged the blue temp sensor prior to starting the set-up procedure? You will also need to remove the oil breather pipe that comes off the rocker cover into the boost return line.

 

Timing is 4-8 deg BTDC as 2000-2500 rpm so I aim for 6 deg BTDC at 2250rpm.

 

You then set the CO to 0.8% IIRC and finally adjust the idle to 800rpm + 50rpm at the end.

 

If its still no good then it is likely to be a sticking ISV (G60 specific item so make sure you have a 037 prefix item).

 

Idle switch works the same as the mk 2 item.

 

An irratic idle could also be caused by an air leak or the hose from the throttle body to the ECU (needs to be exactly 1m in length and the correct VAG stuff), but I would go with a sticking ISV as your issue.

 

All of my vacuum hoses have been replaced last month with proper VAG stuff at the correct length.

 

The ISV's I tried were MK2 GTi items which might explain why they didn't work. I've also cleaned out my ISV and adjusted the close on it with the hidden screw. No joy.

 

Yep, unplugged the blue temp to set the idle.

 

I'll try the idle switch tonight and try to locate a replacement ISV.. Anyone got one?

[RW1 0]

Thought it was like this........

Note the instructions in red (rest basically is the same).

 

- Pull the crank case breather off the black plastic box breather on the rocker cover.

 

- Engine oil at minimum of 80 degrees C.

 

- All switchable electrical loads off but the engine & rad. fan.

 

- Run the engine at idle until the rad. fan has kicked in once and stopped.

 

- With throttle closed, pull off the temp sensor between No.3 & 4 plugs.

 

(If it stalls at anytime, restart after reconnecting this coolant temp sensor connection. Otherwise the ECU will drop into "Emergency Mode" if restarted without the reconnection.)

 

- Check timing at 2,000 - 2,500rpm is 4 to 8 degrees BTC. Aiming to get 6 degrees BTC.

(Adjust if necessary to acheive with rotation of the dizzy)

 

- Raise engine speed in excess of 3000 RPM 3 times by quickly opening the throttle each time and snapping shut, then let idle. (Only perform this if you know your Supercharger is in good condition, this sort of blipping can blow a worn Supercharger. You have been warned!!!!!!!)

 

- Assuming CO % is correct..... (0.7% +/- 0.4% vol.). As with other VW's of this era, both CO/idle are adjusted together to get it absolutley right.

 

- Alter the idle with adjuster on throttle body. (800 rpm, +/- 50 rpm)

 

- Seal up CO if you used it

 

- Reconnect the coolant temp sender connection while the engine is still running and the rad. fan is not running.

 

- Raise engine speed in excess off 3,000 rpm 3 times by quickly opening the throttle each time and snapping shut, then let idle. (Only perform this if you know your Supercharger is in good condition, this sort of blipping can blow a worn Supercharger. You have been warned!!!!!!!)

 

- Check ISV is vibrating & buzzing.

 

- Engine ignition off.

 

- Reconnect the breather.

 

 

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Idle switch is the suspect.

 

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