12 replies to this topic

[MartinS]

When on tickover I can hear a hissing sound coming from the supercharger area which becomes a reedy hissing when driving. Car feels fine and cant see or feel any leaks anywhere.

Any ideas?

 

Martin S

 

[Stevie Dubyah]

When on tickover I can hear a hissing sound coming from the supercharger area which becomes a reedy hissing when driving. Car feels fine and cant see or feel any leaks anywhere.

Any ideas?

 

Martin S

 

 

Is it a new build? Mine did that when a certain Norfolk based tuning shop kindly supplied manifold bolts that were 1mm longer than advertised, so they weren't torquing.

[techieboy]

Try gently rocking the supercharger and see if the noise changes. VIX had a proper screeching noise when his had a leak betweeen the SC and the inlet manifold after one of the bolts had sheared and the noise changed as you pushed/pulled the supercharger body.

[siztenboots]

squirt brake cleaner to find the leak , you will hear the change in engine note.

[fezzasus]

Check all the bolts, when I stripped mine down to rebuild I noticed two bolts missing bolting the supercharger, must have rattled loose.

[furtive]

Have you checked for snakes?

[siztenboots]

going to be vacuum , check map sensor as well

[MartinS]

Supercharger is rock solid, and despite spraying stuff around no engine no change or sign of any leaks.

Remind me, wheres the map sensor? What other vacuum pipes are there as maybe one has a split or something and is sucking rather than blowing.

 

Martin S

 

 

[Steve.i.am]

MAP sensor is on top of the inlet manifold on the right had side. Check AFR pipe also - its a thin pipe than takes off from the middle of the top of the inlet manifold and goes to the left hand end of the fuel rail.

 

Does it do it when you open the throttle and engine on boost? If not, it could be a leak pre-charger and post-throttle body? Theres a hole on the top of the charger which is usually blanked off with a bolt or redundant map sensor.

[CHILL Gone DUTCH]

Brake vacuume pipe ? Could this be the bellow within the bypass

[MartinS]

Its hissing all the time, will check the above.

 

Martin

[Kieran McC]

Its hissing all the time, will check the above.   Martin

Try a spray of washing up liquid diluted spray it on the area , It will bubble up and show the leak.Or buy a aerosol leakdetector from a plummers merchant.

[MartinS]

Nothing found, Ho hum