Thanks for the bump. Almost forgot this thread. My issue ended up being my fuel lines inside the tank. When at idle it was fine, but when you step on it, it fell on it's face. Swapped pump and lines and now it responds much better.

 

Glad you got it sorted! Not entirely the same issue here though, at full blast i runs like a champ so it definitely gets its fuel. My issue is below 2000 rpm.

 

This sounds exactly what plagued me when I first bought the car. No codes - just hesitation when you touched the gas at slow speed. RPM would drop a bit before the power came on. It lasted for months until I got pissed off enough - one day I just floored it when it happened and I finally got a misfire code that told me what cylinder to focus on.

In the end, I bought BBI coils and haven't had a problem since.

 

check the voltage of the 2 accelerator pedal position sensor values and the 2 throttle potentiometer values with durametric "actual values"



do it during a testdrive and look at the oszillogram on the screen during the situation at the issue...maybe you see the failure at the moment it exist with a reaction at the voltage results

 

I haven't been able to induce a CEL or other error codes unfortunately. But I have replaced plugs and coils. Bosch was said to hold up better than Beru so I went with them.


I tried doing a comparison between pedal position and actual trottle-plate position (when stationary). Didn't look out of order, but I'll log an on-run try and report back. I did replace the throttle-body so It would have to be either wiring or pedal potentiometer then I guess.

 

So what was the solution on this? What is a DV and what is a MAF? Sorry if these are basic questions but I am trying to figure out why my 95 has this problem.

 

Still have the same problem.. Haven't had much time to do any logging unfortunately.

DV= Diverter valve. The 996 Turbo has two, that divert turbo pressure back to the intake when you go off the throttle. Prevents compressor surge.

MAF = Mass Air Flow sensor. Measures the amount of air going into the engine. Is mounted in the pipe directly after the air filter.

 

Thanks for the info. Mine is very intermittent. Sometimes I'm at a light and it idles fine. Other times the idle dives down like it's going to die. So far it has always recovered though. Seems to be getting more frequent. My porsche racing mechanic suggested a strong fuel injector cleaner. It seems more electrical to me though. Just worried it's going to leave me stranded one of these times.

 

That sounds like a fuel issue to me. Fuel pump?

 

I've had the car in for diagnostics at the local Porsche dealer and the preliminary conclution is that my car is one of now three in Europe with this issue. The solution in the other cases has been a new DME, at 4900 usd...

 

thats awful. why is porsche's usual solution to everything 5000.00 US?

hmmm.....

 

I have the exact same problem/issue...It happens when I re apply a small amount of throttle during casual in town driving. It's like it momentarily cuts off. If I mash the throttle it does not happen. It is very annoying as it make the transition from off throttle to on throttle very jerky.


Come to think of it, I recently installed an aftermarket MAF. I have notice the throttle response has been twitchy/over sensitive since the new non OEM MAF.


I've also experienced a feeling of a fluttering throttle plenum. If I accelerate through the gears at a very small throttle position, say 1/8 throttle or less and let the car rev up to 3k to 4k, it feels like the throttle plenum is moving even though my foot is not moving on the pedal. The acceleration is not smooth. It feels like the ECU is changing its mind and changes the throttle opening +/- . Only happens at very light throttle application. Thankfully, I am rarely at 1/8 throttle


I'll try the old MAF and see what it does.

 

you will have no consistency from a non oem bosch maf.

 

If I was feeling a flutter I'd calibrate the throttle body and I'd data,of to see if maybe the throttle pedal was going bad.

 

That sucks for sure! But where the heck is the "local" Porsche dealership in Tromsoe?