Can anyone answer this

[barrieeld]

OK i have an s320 cdi car runs fine until i floor the thing in which the car seems to go straight into "get home mode" where the car wont rev past 2500rpm?

Car turbo and all the gubbins have just been replaced so i dont think its a turbo issue, could it be a rubbish pipe feeding the turbo?


any advice would be great.

Barrie.

 

[BlackC55]

Check the vacuum pipes are connected to the turbo. One may have been left off/fallen off.

Of course there is the MAF too.

 

[barrieeld]

Would the vacuum pipes being off give the turbo a noticeably louder "whoosing" sound?

 

[BlackC55]

No.

You probably have a turbo pipe off or split. Or maybe a split intercooler.

Get who ever done the work to check it over.

 

[barrieeld]

Split intercooler? Or split intercooler pipe. The intercooler was replaced when the new turbo was put in?

 

[barrieeld]

Thanks BlackC55 for the heads up and let you know how i get on

 

[gl boy]

also look at the main air intake pipe it may suck together if very supple as the new ones have a reenforcment in them...hope it helps

 

[barrieeld]

any other suggestions folkes replaced all the pipes and had it on the diagnostic machine with no fault codes?

it seems only if i floor the thing i can bring this fault about.....it must also be noted that it doent happen every time i floor the thing.

I feel it is somthing to do with boost pressure

 

[television]

any other suggestions folkes replaced all the pipes and had it on the diagnostic machine with no fault codes?

it seems only if i floor the thing i can bring this fault about.....it must also be noted that it doent happen every time i floor the thing.

I feel it is somthing to do with boost pressure

This could be just the MAF causing the problem

 

[barrieeld]

Hi Malcolm,

forgot to mention already tried the MAF and it made no difference

 

[glojo]

Car turbo and all the gubbins have just been replaced so i dont think its a turbo issue, could it be a rubbish pipe feeding the turbo?


any advice would be great.

Barrie.

Hi Barrie,
Did you carry out the work? I only ask because if a garage did this work and you have taken it back, then how come they have not cured this problem? You say how it is replicated when you put the pedal to the metal so hopefully it should be straight forward to diagnose. If you carried out the work, then I will very respectfully suggest you take the car to a reputable garage.

John

 

[grober]

Hope you got a genuine Bosch MAFF when it was replaced and not a cheap E-bay knock off from China?? Still come back to my previous suggestion about the gearbox ECU playing up. Has that been checked out? The reason I suggest this that you are mentioning "flooring it" which must put the gearbox under some strain/rapid change down which it doesn't like ? The other things that come to mind are engine/electrics earthing faults or problems with the alternator causing voltage spikes in the electrics causing the ECU to go into limp home mode.
Don't the MB diagnostics come up with a stored fault/s for going into limp home mode?
Does the fault occur if you build up the revs slowly to high RPMs?

 

[television]

Hope you got a genuine Bosch MAFF when it was replaced and not a cheap E-bay knock off from China?? Still come back to my previous suggestion about the gearbox ECU playing up. Has that been checked out? The reason I suggest this that you are mentioning "flooring it" which must put the gearbox under some strain/rapid change down which it doesn't like ? The other things that come to mind are engine/electrics earthing faults or problems with the alternator causing voltage spikes in the electrics causing the ECU to go into limp home mode.
Don't the MB diagnostics come up with a stored fault/s for going into limp home mode?
Does the fault occur if you build up the revs slowly to high RPMs?

The gearbox can only store a limited amount of fault codes, if you have a fault on the box that is not coming up on STAR, then you have to get the codes read once they have happened and without turning the engine off, once you turn of the box re sets

 

[barrieeld]

yeh that seems to be the problem,

Once the car is turned of then on again there are no faults to report so its had to try and diagnose the problem.

Its wierd cause i can be driving floor it and it will respond as its ment to...other time ill floor it and i immediatly drops power and goes into "get home mode".

I always take the car to the garage to be sorted but fter we tried all the pipes and MAF etc the mechanic told me to drive it for a few weeks taking a note of when it happens so he could diagnose the issue better.

He said it was hard to get somthing from STAR becuase the car has to be turned off to get it onto the machine.

 

[television]

yeh that seems to be the problem,


He said it was hard to get somthing from STAR becuase the car has to be turned off to get it onto the machine.

This is MB's words that it must be plugged in without turning off, maybe some one that uses STAR can explain