cypress_33415

I need the facts on using a vss with my swap. I'm using a 2004R tranny. I keep reading conflicting views on this issue? The issue I'm having is the car idles fine and revs fine but when I drive the car it runs like a$$. I'm throwing p0502 code also. Will not using a vss cause this kind of problem? I've read posts where people don't use one and they don't mention anything about driving issues?? Then I'll read another post about speedo's,cruise control and nothing about drivability? I'm have a cable speedo and no cruise control, so do I really need a vss or not???
Thanks

oange ss

iTrader: (50)

only for an electronic speedometer or cruise control

cypress_33415

So the driving problems I'm having would not be related to not having a speed sensor. Correct

oange ss

iTrader: (50)

correct

downset71

wrong. it is not just for speedo or cruise....the car will run fine, but on coasting or de-accelaration,or braking especially, it gives a little extra rpm on the idle to keep from stalling.....i have a 700r4 behind mine BTW.......mine never threw a code even with VSS not hooked up

cypress_33415

I have heard about the stalling issue. Any recommendations on which company sells the correct vss for the 2004r? I'm going to take my car to Dan at Masport motorsports in boca FL to have it tuned. I just can't figure out why it drives so bad while it runs and idles great?

downset71

a 200r4 case with a VSS setup on the *** is very very rare..as in 87 turbo T.A. setups only.this is what my friend who does transmissions told me....other than that, maybe an external reluctor ring setup on your rear near the yolk. JAGSTHATRUN.com maybe......or some kind of rigged up sensor on driveshaft

TomM

iTrader: (56)

Call these guys, they should have a solution....

http://www.transmissioncenter.net/sp...n_______va.htm

T,

Buckndol

If this is like a 4L65E, the VSS has two wires running to the Transmission Control Module. This signal is necessary to tell the transmission when to shift. It sends a signal to the ECM and determines your throttle to determine kickdown and shifting up. I also know that if the wire from the ECM for speedometer is hooked to other than a factory speedometer (like a Dakota Digital, it will definately mess with the engine performance.

downset71

some companys also sell a vss sensor setup that goes in place of speedo output....

LS1MCSS

iTrader: (18)

Jagsthatrun has a VSS that will screw onto the tranny and the the speedo cable screws onto it. They are at the link below. I don't remember if the LS1 needs a sine wave or square wave VSS, but they have both. Scroll about half way down the page.

http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf

classic79

I also have a related ? about the VSS. I have an 1989 Suburban with a 700r4 and it has the VSS that is in the speedometer. What wire or wires do I hook this VSS up to on a 02 4.8 computer?

thedrill

iTrader: (1)

I used pins 20 and 21 iirc on the green plug off the ecu.

deuce4935

iTrader: (2)

What type of gauges are you running? Also, does the 200-4r have the vss at the tailshaft? If theres no vss on the trans and you're not running electronic speedo, you can simply have all of the trans controls deleted from the pcm and your worries will be nomore.

downset71

hey duece, thats the problem...200r4 doesnt have a VSS capible tailshaft...but it should be installed somehow because of that raised idle issue....

BigMan66

Check this out: http://www.gmcopo.com/engineswap.htm