223/P0107 Intake Manifold Pressure Fault

[J2LTB]

How does the ECU control the idle speed on a CSL? Normally on a Cossie, when the idle fluctuates, its because the Idle Speed Control Valve needs cleaning. This allows air to bypass the throttle butterfly (but is a single one not individual cylinder ones like on the CSL). When it gets clogged with gunk, it can't react quick enough, so the idle hunts up and down until the engine gets warm, where it then turns off (as it comes on as part of the cold start where it acts like a choke). It also turns back on to raise the idle when the air-con is switched on and can do the same thing if not clean (where it keeps over compensating one way and then the other due to the stiction caused by the gunk). If the CSL has a similar mechanical device (even if it is some sort of electronic butterfly control), if the butterflies are clogged up, it could be this?

Having seen how dirty they can get (especially after hearing about your climate), it is something I would be looking in to?

Mike the idle control valve feeds of the filtered side of the airbox. This is controls the air going to the top chrome rail which lets air to the other side of the throttle bodies. It looks similar to the injector fuel rail. I've swapped my idle control valve and it's made no difference 😔

[Mike RT4]

Well looks like testing Shane's theory, as that sensor is relatively cheap so I have been lead to believe .

[J2LTB]

Quick update of my problems and the fix.

One of the throttle body stop screw head's had snapped. Over time the thread had screwed itself in more holding the butterfly open when it should have been shut on idle. Thus causing a air leak😀😀😀😅
Only found when we put pressurised smoke through the idle valve rail.

The fix was to remove the damaged thread and renew the bolt and nut. Set it all up and no air leak. Car is now back to its amazing self 😆

[0-60motorsports]

Quick update of my problems and the fix.

One of the throttle body stop screw head's had snapped. Over time the thread had screwed itself in more holding the butterfly open when it should have been shut on idle. Thus causing a air leak😀😀😀😅
Only found when we put pressurised smoke through the idle valve rail.

The fix was to remove the damaged thread and renew the bolt and nut. Set it all up and no air leak. Car is now back to its amazing self 😆

That's awesome! Can you post a pic of the screw and its location please? Thanks.

[0-60motorsports]

Ok, So my cars going batshit crazy.... Here are the fault codes from the CEL after replacing MAP and IAT sensors and re-soldering all wires with no breaks in between....

[J2LTB]

Not too sure about those codes . Any translation ?

[0-60motorsports]

Fuel System Diagnosis 1 and 2 errors

below the temp readings and adaptation readings it says:

partial load - MIN error
Error exhaust relevant OBD
Error currently available
static error