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  #1  
Old 12-13-2018, 05:19 PM
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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
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1992 SVX Purple and Black 5 speed swap

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  #2  
Old 12-14-2018, 01:44 PM
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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...
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1992 SVX Purple and Black 5 speed swap

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*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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  #3  
Old 12-14-2018, 04:40 PM
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Re: Rpm cut off at 3,500rpm

Quote:
Originally Posted by sd2649 View Post
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...
I agree with you 100%.
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  #4  
Old 12-14-2018, 07:12 PM
svxnavyvet svxnavyvet is offline
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Re: Rpm cut off at 3,500rpm

looks like rev limiter limp mode but no check engine light?
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  #5  
Old 12-14-2018, 07:32 PM
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Re: Rpm cut off at 3,500rpm

How long has it been doing it?
How long ago was it converted to 5 speed?
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  #6  
Old 12-14-2018, 08:43 PM
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Re: Rpm cut off at 3,500rpm

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Originally Posted by oab_au View Post
How long has it been doing it?
How long ago was it converted to 5 speed?
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?
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1992 SVX Purple and Black 5 speed swap

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*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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  #7  
Old 12-14-2018, 08:54 PM
oab_au oab_au is offline
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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?
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  #8  
Old 12-14-2018, 11:32 PM
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Re: Rpm cut off at 3,500rpm

I didn't do the swap. I'm asking the mechanic now.
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1992 SVX Purple and Black 5 speed swap

SOLD
*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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  #9  
Old 12-15-2018, 01:19 AM
oab_au oab_au is offline
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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
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  #10  
Old 12-15-2018, 08:39 PM
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Re: Rpm cut off at 3,500rpm

Quote:
Originally Posted by oab_au View Post
This is one of the problems that a conversion had.

www.subaru-svx.net/forum/showthread.php?t=60412
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.
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Last edited by Trevor; 12-15-2018 at 08:47 PM. Reason: Typo
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  #11  
Old 12-15-2018, 08:46 PM
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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.
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1992 SVX Purple and Black 5 speed swap

SOLD
*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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  #12  
Old 12-15-2018, 10:43 PM
oab_au oab_au is offline
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Re: Rpm cut off at 3,500rpm

The engine movement must have been moving it on and off.
That was an easy fix.
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Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
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  #13  
Old 12-16-2018, 12:19 AM
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Re: Rpm cut off at 3,500rpm

Quote:
Originally Posted by sd2649 View Post
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.
Good one, my analysis was spot on.
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  #14  
Old 12-17-2018, 02:24 PM
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Re: Rpm cut off at 3,500rpm

Quote:
Originally Posted by oab_au View Post
The engine movement must have been moving it on and off.
That was an easy fix.
Absolutely, I had nightmares this wouldn't ever go away...
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1992 SVX Purple and Black 5 speed swap

SOLD
*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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  #15  
Old 12-17-2018, 02:25 PM
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Re: Rpm cut off at 3,500rpm

Quote:
Originally Posted by Trevor View Post
Good one, my analysis was spot on.
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.
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1992 SVX Purple and Black 5 speed swap

SOLD
*1993 SVX Silver and Black
*1994 SVX L Barcelona Red FWD
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