exhaust query

[defender_hank]

could a leak between the exhaust manifold and down pipe cause a drastic decrease in top end engine performance??? im gonna gun gum the hell out it tommorow anyway. was just wondering

 

[jamesmartin]

no

 

[Silverlandy]

no

Well that told you.

 

[defender_hank]

If your car was produced after 1995 and has an exhaust leak upstream from the catalytic converter, then the exhaust leak will almost certainly cause a reduction in performance. This can occur because the engine's oxygen sensors are not receiving correct information about the engine's air-fuel ratio, which will cause the engine to inject more or less fuel to compensate. This decreases engine performance, particularly in the low-RPM band.

found this online ! load of old tosh then, cheers for quick reply
​

 

[jamesmartin]

If your car was produced after 1995 and has an exhaust leak upstream from the catalytic converter, then the exhaust leak will almost certainly cause a reduction in performance. This can occur because the engine's oxygen sensors are not receiving correct information about the engine's air-fuel ratio, which will cause the engine to inject more or less fuel to compensate. This decreases engine performance, particularly in the low-RPM band.

found this online ! load of old tosh then, cheers for quick reply
​

in this case yes

 

[defender_hank]

ok will go back to problem solving solutions then. noticed a damp injector run off pipe. will try that next. the performance is just gutless when the revs get higher in third and fourth gear. feels like a lack of boost from turbo however i can hear it wind up under load

 

[wangie46]

You have a 200tdi therefore you don't have an ecu and lambada sensors so the bit you found on the web does not apply to yours as James has said

 

[landowner]

Could be a leaky intercooler pipe

 

[defender_hank]

yes i will strip everything out at this side when doing exhaust fix and check the lot.

many thanks

 

[lynall]

Lift pump cheap and easy.


Lynall

 

[defender_hank]

sorry should of said ive renewed every part of the fuel system in december last year with genuine parts. had an issue with air in fuel it turned out to be a fault with the injector pump. that was after i changed every pipe from tank to injector pump/ lift pump/fiter housing and injectors. so i am confident its not a fueling issue.

the engine is starting over fine and idleling perfect. the problem arrises when under load at high revs.

 

[Dippypud]

sorry should of said ive renewed every part of the fuel system in december last year with genuine parts. had an issue with air in fuel it turned out to be a fault with the injector pump. that was after i changed every pipe from tank to injector pump/ lift pump/fiter housing and injectors. so i am confident its not a fueling issue. the engine is starting over fine and idleling perfect. the problem arrises when under load at high revs.

Check for boost leaks, clean the intercooler and check the turbo wastegate is free. Might also be an idea to install a boost pressure gauge to see whats going on.

 

[jamesmartin]

to prove fuel side a clear plastic pipe in between filter and front banjo bolt on pump lets you see air at all revs ,what isnt a leak at idle might be at higher speed ,check boost pipe from turbo to injection pump and as said waste gate is shut

 

[defender_hank]

quick update the problem just vanished must of had something untoward being sucked up the fuel lines. running fine now and pulling like a pack of huskies with hardons