Rpm cut off at 3,500rpm
 

I need help. I have a 5 speed swapped SVX, CEL isn't on, just rpm cut at 3,500rpm most of the time. Here's a video of it in neutral, does it in all gear though (really jarring in gear of course)

https://youtu.be/KBmwa2EbwaY

Re: Rpm cut off at 3,500rpm
 

Where does anyone go for help with the SVX these days? This is so sad compared to how this forum used to be back when I first joined...

Re: Rpm cut off at 3,500rpm
 

I agree with you 100%.

Re: Rpm cut off at 3,500rpm
 

looks like rev limiter limp mode but no check engine light?

Re: Rpm cut off at 3,500rpm
 

How long has it been doing it?
How long ago was it converted to 5 speed?

Re: Rpm cut off at 3,500rpm
 

Just the past 2 days. A month ago.

I have saved CELs for both O2 sensors, but nothing current. If somehow both O2 sensors were out, would it run right or cause this?

Re: Rpm cut off at 3,500rpm
 

I can't think of anything that would cause it sorry, but I have seen some 5 speed conversions where the wiring was altered that caused some problems. Did you run any extra wiring, or jump any connections?

Re: Rpm cut off at 3,500rpm
 

I didn't do the swap. I'm asking the mechanic now.

Re: Rpm cut off at 3,500rpm
 

This is one of the problems that a conversion had.

www.subaru-svx.net/forum/showthread.php?t=60412

Re: Rpm cut off at 3,500rpm
 

It does not appear that the transmission or its connections are involved with the tacho.

The taco utilises a signal from the ECU, which apparently uses the crank position sensor or the engine timing circuitry in order to detect engine speed.

The tacho derives its ground and battery voltage supply via a two pin plug-socket connected by a black ground wire and a green yellow positive supply wire, supplied via fuse 15. From the available diagrams it appears to exit the instrument loom and is under the dash.

Worth a check for voltage and ground.

Re: Rpm cut off at 3,500rpm
 

Fixed it. Loose ground terminal on the intake manifold. Back passenger side. I figured it was a ground issue when my speedo started cutting out too.

Re: Rpm cut off at 3,500rpm
 

The engine movement must have been moving it on and off.
That was an easy fix.:)

Re: Rpm cut off at 3,500rpm
 

Good one, my analysis was spot on.:)

Re: Rpm cut off at 3,500rpm
 

Absolutely, I had nightmares this wouldn't ever go away...

Re: Rpm cut off at 3,500rpm
 

Spot on analysis! I had the intake manifold off a week ago to replace all the cracking vacuum lines and PCV system. I finger tightened that bolt and forgot about it as the car was running perfect. I guess it wiggled loose.