Hi Guys and gals, please help. I have asked my dealer to check this out a couple of times now and they have not come up with anything yet!!

Under acceleration say in 5th gear on the motorway from 2k revs upwards, i.e. off turbo to full boost, there is naturall turbo lag, but once upon a time the turbo would come in smoothly, it now has fits and bursts of boost then non of low boost and so on, not at all smooth and my passengers notice it too!!!

Also say 3rd gear through the rev range, boost will occasionally feel strong then dip then come back etc, basically, the car is being completely temperemental and I never know when I will get full power or not.....

Time of day, cold, hot, weather is not a contributing factor. I need to sort this out...

I just want ideas so I can ask the dealer to investigate a few things for me.

Thanks in advance, I am sure you won't let me down..

 

A normal problem.
'They all do that' is the usual reply from garages.
The problem is something along the lines of - weird stuff goes on in the inlet pipe at spool-up (turbulence, etc. around atmospheric), leading to the MAF not knowing what's going on & feeding duff info to the ECU which doesn't know how to fuel correctly.
The solution is to change the inlet path - either by replacing the standard collection of tubes & funnels with something 'cleaner', or prefereably removing the MAF altogether (which would then require a new ECU...)
A possible temporary fix, I suppose, might be to clean the MAF. Could be the dirt which starts doing this at some point? Either than, or it's initial stages of the MAF on its way out... this wouldn't be detectable by the garage with their 'select monitor' effort, by the way; that only detects it being broken, not on its way out/misreading.
Depends on MY how likely the MAF is on its way out. MY99/00 are most susceptable to this.

 

If it's more of a surging sensation than hesitation then check this thread out:

http://www.scoobynet.co.uk/bbs/threa...hreadid=178377

[Edited by ShinyAndy - 3/3/2003 11:06:57 AM]

 

Cheers Guys, it is a my 99!!!

 

Many thanks to Shiny Andy here, sorted it last night, car feels fab!!!

GGGrrrrrrrreeeeeeaaaaaaaaat...

Cheers