vechicle speed sensor

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 24, 2004

#1

• Jan 24, 2004

• #1

ok guys im converting my convertable to mass air do i really need a vss hooked up for it to run right id think it wouldnt affect much if any with the straight drive thanks

 

jrichker

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#2

• Jan 24, 2004

• #2

67efivert said:

ok guys im converting my convertable to mass air do i really need a vss hooked up for it to run right id think it wouldnt affect much if any with the straight drive thanks

Click to expand...

Vehicle Speed Sensor (VSS) is an electronic sender mounted on the speedo pickup gear on the trans. It works the cruse control for both 5 speed and auto trans cars. On auto trans cars, it tells the computer to speed up the idle slightly as you slow down to a stop to keep the engine from stalling. Check to see if the electrical connector is plugged into it. Cost is under $30 and it is easy to replace.

 

G

goldbomb79

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Jun 4, 2003

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Jan 24, 2004

#3

• Jan 24, 2004

• #3

yep, you can get one for i think 22 bucks at autozone or advance auto. i know i got mine from one of those two places

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 25, 2004

#4

• Jan 25, 2004

• #4

ok guys this is in my 67 convert i built the harness myself runs fine havent drove it yet though no cruise or anything like that t5 trans will it affect the running any at all im just curious finding a cable to work with my autometer speedo and a vss might be a problem right now the stock cable works perfectally wiring it up isnt a prob just need to know if for some dumb reason if it might affect closed loop or timing curve thanks

 

Michael Yount

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Apr 10, 2002

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Charlotte, NC

Jan 25, 2004

#5

• Jan 25, 2004

• #5

If the VSS on the T-5 is connected to the pigtail/electrical connection that hangs out of the driver's side, front of the tranny, mine has been disconnected from the computer for the whole 8 years that the engine/tranny have been in the car with no apparent side effects.

I would like to understand more about it however. JRichker -- is that electrical plug hanging out of the front of the tranny connected to an internal vss device? My tranny was purchased new from Ford Racing about 4 years ago - it's a World Class T-5Z. I have an A9L computer, and I've wondered if there's any benefit to hooking up that plug into the computer inputs. Do you know which pins on the ecu plug the wires are supposed to hook to? Also, how does the vss work? Are there magnets and a pickup internal to the tranny? Lots of questions - do you know what type of signal it generates? My after market cruise unit has pin-selection switches that allow for different types of speed signals - square wave, etc.

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 25, 2004

#6

• Jan 25, 2004

• #6

the vechicle speed sensor is only on the speedo cable on a t5 trans its actually a generator that makes ac voltage and the comp converts it to a speed signal im just not sure if it would affect anything else so im guessing that since u dont have one on urs eithor then it should be fine thanks

 

Michael Yount

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Apr 10, 2002

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Charlotte, NC

Jan 25, 2004

#7

• Jan 25, 2004

• #7

67efivert said - "the vechicle speed sensor is only on the speedo cable on a t5 trans"

Can you be more specific? I don't understand your statment. My tranny has a speedo cable which drives my speedometer. Are you saying the VSS is part of the speedo cable set up? Mine just has a plastic gear on the cable that's driven from the plastic gear on the output shaft. If the electronic plug/wires connected to the front of the tranny aren't from a VSS, do you know what they are from?

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 25, 2004

#8

• Jan 25, 2004

• #8

the wires ur tlking about is eithor the reverse switch or neutral saftey
the later stock cables had a vss sensor hooked to it ovsiouly u dont have that kind of cable

 

Michael Yount

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Apr 10, 2002

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Charlotte, NC

Jan 25, 2004

#9

• Jan 25, 2004

• #9

That helps - thanks. Reverse switch is just a little screw in sensor - I used that for my back up light activation. What I'm referring to has an electrical connector much like the ones that plug into the tps sensor or the ACT sensor; it must be a neutral safety switch connection - I'll leave it alone.

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 25, 2004

#10

• Jan 25, 2004

• #10

so do u have any odd surging or any driveability problems at all if not im not gonna even bother with the vss on mine eithor

 

Ranchero5.0

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Jan 25, 2004

#11

• Jan 25, 2004

• #11

67 the vss also speeds up the idle on a 5 speed car as a dashpot device to keep the engine from stalling after an engine brake decel. Without it you may have some surgies when you push the clutch pedal in after decellerating. If the car is prone to surging it may help the puter work out the problems a little, but don't expect the world from it alone. On the MAF conversions I hooked it up on 5 speed cars, but left it off of a AOD car and didn't see any issues.

Michael, the Nuetral safety is on the front of the top plate on the T5.

 

Michael Yount

Mustang Master

Apr 10, 2002

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Charlotte, NC

Jan 25, 2004

#12

• Jan 25, 2004

• #12

What exactly is it that is on the top plate? Mine has an electrical connector (just like the tps or ACT sensor) that connects to two wires. The two wires run into the top of the tranny. The electrical connector hangs down on the driver's side of the tranny very close to the bell housing/clutch cable port.

67 - no drivability/surging issues realated to lack of a vss.

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 25, 2004

#13

• Jan 25, 2004

• #13

well if i get any problems ill add one other wise i wont bother thanks yall

 

6

67efivert

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Jan 26, 2003

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lincolnton nc

Jan 28, 2004

#14

• Jan 28, 2004

• #14

anyone else got any input been too cold to work on it so ill fire it up soo

 

86T-Top

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Jun 29, 2001

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Dublin, PA

Jan 28, 2004

#15

• Jan 28, 2004

• #15

Michael,

The wires that you are talking about, coming from the top plate of the t-5 trans and hangs down the driver side near the bellhousing is for the neutral saftey switch. The VSS is inline on the speedo cable, if you have one, you would have your speedo gear, than the vss, than the speedo cable witch would then go up to the speedometer. The VSS has two wires that plug into the EEC, they plug into pins 3 and 6 in the EEC. The VSS has two purposes, one for cruise control, the other to raise or control the idle when coming to a stop. Just as Jamie said it acts like a dashpot on a Carb. I have heard of plenty of people not running one when they convert their 60's mustang to EFI and not have any surging.

Mario

 

6

67efivert

Member

Jan 26, 2003

348

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lincolnton nc

Jan 28, 2004

#16

• Jan 28, 2004

• #16

thanks i hope it dont have any ill effects on mine