Performance Again?

[GaryM]

I've asked this before but I'm running out of things to try...

 

I have a secondhand 1.9L 115bhp TDI (73,000miles). Being my first oil buirner I was not sure what to expect in terms of performance but was at least expecting good MPG.

 

Having plenty of time to get used to it now I'm typically getting 32-35MPG. I must admit that my driving style is not the best for MPG but I expected it to be a little higher having read posts of 45. Still it is much better than my 2.3 Petrol.

 

Acceleration is not as swift as I would expect and seems to loose steam around 3000rpm. Passing can be fun and hills can also see me losing speed and having to pull over. The final thing that seems odd is that there is strange effect while changing gear and reapplying the accelerator. There is a sudden surge of power and then it drops off right away and accellerates less swiftly.

 

 

These are the things I have done/tried so far...

• Replaced the air filter, was dirty and gave a notable change in performance.
  
• Disconnecting the MAF makes the car accelerate real slow topping out at 60MPH. Therefore I assume it is OK.
  
• I have removed and cleaned the EGR. This was gummed up but cleaning it made no difference.
  
• I cleaned the inlet manifold. This was not that bad and made no difference.
  
• Changed the fuel filter. Seemed really dirty but made no change.
  

Any thoughts of things to change or test first. BTW as you may have realised I'm not a mechanic.

 

Thanks in advance

[Guest kd035050]

it sound like the waste gate valve on the turbo. If I were you I would get it to tame expert and get it checked. I have a friend with a VW that was loosing power and his dealer could not find the fault and it turned out to be that little turbo presure valve that was not doing its job. On your model your perfomance should be nearly as good as thwe 2.3 and hills should be no trouble.

 

 

Chris

[GaryM]

Cheers for that. Where do I find the valve? I assume it is vaccum controled. I thought I had checked all the pipes for leaks but perhaps I missed one. I'll check my copy of TIS once I find the CD.

[Guest OXO2 PUB]

Your getting around the same MPG as me, what kind of driving do you do?

 

I'm mostly inner city driving loads of stops and starts and sitting in traffic, when I have an open road though the little devil on my shoulder takes over and my lead foot comes into play.

 

I dont usually do motor way miles but when I do there not at a very good speed for MPG.

[GaryM]

Found my copy of TIS and it would appear that on the 115 there is no wastegate but a variable pitch blade system. Still checked the vac pipe and that seems fine but I need to get better access to take a proper look.

 

Most of the driving is just local stuff and is driven by the missus. We are off on a longer jaunt at the weekend so I have chance to see how it fairs then. I don't really have a problem with the MPG but just wondered if it was linked to the sluggishness in some way.