VSS and throttle cut

**speedracer9k** · 08-21-2008 07:11 PM

I have been stage 3 for a little over a month and having a problem. Initially the speedometer was bouncing around and the gas gauge as well. I replaced the VSS, still the same issues followed. I have also search for damaged wires and have found not one. Recently the speedo is either working or dead, no longer bouncing around. While it's dead the gas gauge will go up and down and the car throttle cuts at around 5,000 rpm. Anyone ever experience this type of issue? Just wondering if it may still be associated to the VSS itself or possibly something with the ECU. Also CEL shows Vehicle Speed Sensor, implausible signal. Any help is greatly appreciated. Thanks in advance.

**speedracer9k** · 08-22-2008 12:20 PM

any ideas guys?

**Jung** · 08-22-2008 12:26 PM

when you plugged it in, did you check the connection? was it free and clear of any contaminants?

**ladedruck** · 08-22-2008 12:33 PM

the throttle cut is the rpm limiter the ecu has during the speed sensor fault. You might want to check you connections for the engine harness behind the ecu.

**speedracer9k** · 08-22-2008 12:51 PM

I have totally removed the ECU and plugged it back in, but no luck. It seems to have resolved the problem for a short time but it came right back. I will check the VSS connecter again to make sure that it's clean.

**AAAA** · 08-22-2008 02:11 PM

i'm not sure where it is in this car, but on my b7, the sensor is near the intake mani and this code was thrown and the sensor was actually not pushed all the way in. try and figure out where it actually is and make sure the sensor is plugged all the way in

**The_Jerbel** · 08-22-2008 08:02 PM

Did you get the correct software for your car when you went stage 3? (A box, M box, etc)

**AAAA** · 08-23-2008 11:24 AM

Originally Posted by The_Jerbel

Did you get the correct software for your car when you went stage 3? (A box, M box, etc)

i would hope so, i sent it to vast and they put the chip on there

**The_Jerbel** · 08-23-2008 01:52 PM

Gotcha. Just call them to make sure they didn't make a mistake on your cars MY.

**speedracer9k** · 08-24-2008 10:28 AM

I believe my original ecu was a T-Box with a MTM chip so the tuner sent me a Stg 3 M-box. It's really weird because if the car sits for a while it will work ok when I get in but about 15 minutes later the speedo will die and of course the throttle cut.

**ladedruck** · 08-24-2008 10:32 AM

You may have done this but what I was saying to check was the plugs behind the ecu for the main harness. the red,orange etc plugs. I believe the speed signal gos through one of then into the instrument cluster. Most people undo these plugs to take the engine out.