Ok my 89 dx has a few problems with it. The motor I have in the car is a jdm d15b. First for some reason i keep throwing a vss code (17) i dont really know why beauce everything looks to be ok with with wiring. Second, when im at a stop my car will rapidly go from 1 thou rpms to almost zero and back and forth. It sounds like it is going to die out. Any help with these problems would be great, thanks.

 

with the vss code, does your speedometer work? with the idle, check you iacv .

 

The speedometer works fine, even with the cel on. Just not sure why it keeps throwing the code.

 

Have you ever changed the main relay? Seems to fix a lot of random problems.....

 

No never thought that would cause any of my problems.

 

Does anyone think it may be the plug wires, spark plugs or distributer causing the weird idle jumping.

 

yo i had the exact same problem. make sure ur running the right ecu for ur car, cuz turns out i was a running an integra ecu when i needed crx. The integras run an electrical speed sensor, whereas the crx runs a mechanical so the CEL would always be on. i changed the ecus and bingo no more vss code

 

Yeah im running the rite ecu, so thats not the prob. the vss only comes on then i break really hard or hit a big bump.

 

Can any one else pinpoint what it might be????

 

If you are still using a mechanical VSS, make sure that it is in all the way and clipped in with the locking clip.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TEXREX88 &raquo;</TD></TR><TR><TD CLASS="quote">Have you ever changed the main relay? Seems to fix a lot of random problems.....</TD></TR></TABLE>

nooooo. why do people hate the main relay so much.
VSS probably isn't getting a signal from the dash to the ECU. There's a wire that runs between. Either your ECU Jumper has that wire mis-pinned or broken, or it's disconnected somewhere between your guage cluster and the ECU. You'll need to check this with a volt meter for continuity.

As for the "hunting" (idle surge) Try adjusting your idle screw. Then clean your IACV.
If you don't know what I'm talking about download the service manual and go through the troubleshooting steps like it says:

http://www.norcalcrx.org/library/ (workshop manual link on the right)

 

Thanks for everyones input.