Important! : Hissing noise when accelerating

30th May 2010, 21:31

Hi guys right i dont have the saxo anymore but own a mk1 mondeo at the moment and when i accelerate a loud hissing noise is coming from engine area. The harder i accelerate the louder the hiss, and when i take my foot off accelerater it quietens down, also i have lost speed due to this too.

I put it on here as my mondeo forum login isnt working.

Thanks in advance

31st May 2010, 11:08

Oh come on.. Someone on here must know what the problem is?!

31st May 2010, 11:16

sounds like an air leak mate, check the inlet manifold while the car is running, as there could ba a vacume pipe off, does the car stall at all?

31st May 2010, 11:29

Quote:

Originally Posted by SnakeVTR

sounds like an air leak mate, check the inlet manifold while the car is running, as there could ba a vacume pipe off, does the car stall at all?

hi mate well it idles fine most of the time the only time it didnt was when we had that cold snap with all the snow then it stalled in traffic, but i will check intake, i didnt know if it could have been a gasket? like on manifold? if so would that cause the hissing?

31st May 2010, 12:20

yea that would definatly cause hissing, and would also cause running problems, possible increased idle speed and loss of power, as an air leak after the air mass meter( air flow sensor) will cause incorrect fueling

, try to have a real good look around the manifold whilst somebody revs the engine, there is a good chance youl be able to locate the fault, i take it your car in naturally aspirated being a mk1 mondeo

31st May 2010, 17:49

ive got a similar problem with my vts, i found that the lower engine breather is loose so going to try and loctite it in