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Hoses On Back Side Of Intake Collapsing When Running (Pic Included)

XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Hoses On Back Side Of Intake Collapsing When Running (Pic Included)

 
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Old 05-02-2019, 05:05 PM
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Default Hoses On Back Side Of Intake Collapsing When Running (Pic Included)

I noticed while bleeding my radiator today that these circled hoses on this crossover pipe between the intakes collapse when the engine is running- I assume this isn't correct, however the car runs fine- Can i just replace these rubber hoses with some stiffer ones? Or is there an underlying issue?


 
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Old 05-02-2019, 07:57 PM
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Nothing special at all.

Those have probably failed the integrity test due to oil fume contamination from the inside. 30 years is a good life in those conditions.

NORMAL.
 
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Old 05-02-2019, 08:37 PM
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Thank You Kind Sir- Just replace and move along I assume
 
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Old 05-02-2019, 08:39 PM
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Dont forget the beer, must keep up our fluid intake, coffee 4 just hit the tongue, YUK.
 
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Old 05-03-2019, 04:43 AM
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Your hoses look long, at least compared to mine.
Mine are for sure too short too ever collapse no matter how soft they become

 
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Old 05-03-2019, 07:59 AM
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Thanks for the image Leo- It certainly seems yours are shorter- I will go that route when i replace mine- There is quite a bit of suction on this line for it to collapse both of those hoses- Yet it seems to make no difference in the engines ability to operate at all(that i can tell anyways)- Anyone know what this cross pipe is supposed to accomplish?
 
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Old 05-03-2019, 01:04 PM
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The cross pipe balances the air feed to the two banks, if (say) the throttle butterflies were not identically synchronised it would effectively balance the air intake each side as the pipe is manifold to manifold, "inside" the butterflies. Also, when the AAV/tickover is operating (which is attached to one side only) it ensures both sides gets the same air feed. It also ensures the ECU sees an "average" vacuum signal, rather than just from one bank.
 
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