power problem

[Grant Lenahan]

Rick,

It could be many things, btu what comes to mind is mixture - possibly  
caused by vacuum leaks, or a faulty O2 sensor, but those are guesses.  
Step #1 is to pull any codes available, or, with an older car,  
possibly do more involved diagnostics like measuring exhaust under  
various loads ( and maybe reading the O2 sensor feedback).

I'd start with the basics - check for leaks, then pull the O2 wire  
and see what happens.  Re connect if it cures anything - you dont  
want to ruin your cat, just 'cuz the car's a dog.

Grant
On Jan 17, 2008, at 8:48 PM, Rick Cone wrote:

> Hello, just signed up!
>
>   I just bought an 89 200 avant quattro with a 10v turbo, 5 speed.   
> It had sat for a year and a half before I bought it.  Overall I  
> really like the car; it only has one problem.  It runs awesome at  
> light throttle, but when you give her the berries, it falls flat on  
> it's face.  In 3rd 4th and 5th it really hesitates all the way up.   
> It's like it has more power at light throttle than at full  
> throttle.  It is most pronounced as soon as it hits boost.  But I  
> get full boost, so I don't know what's the matter.  I've replaced  
> plugs, air filter, cap and rotor.  Wires looked good and I heard  
> these cars were touchy about wires so I'm ordering a universal set  
> of MSD wires to make a set out of.  It seems like the fuel pump is  
> noisy too.  where should I start looking?  I want to get the ecm  
> done, but first I need to iron out this problem.  Thanks for your  
> time!
>
>   Rick A. Cone
>
>
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