VSS-do I need it?

av bronco · Feb 16, 2010

Im thinking about going to MAF FI, my question is with a C4 and dana 20 do I need a vss and if so what can I use and still retain my stock speedo?

hmh800 · Feb 17, 2010

To the best of my knowledge the answer is no. I believe the VSS's only purpose in your application is to increase idle speed when you are decelerating to keep the engine from stalling. This is what I gathered when I was putting a '91 mustang motor in my Jeep. I did not put in a VSS and never had any issues. I just sold the Jeep and plan to put another efi motor in my '68 Bronco and do not plan to use a VSS (for what it's worth). Hope this helps.

Viperwolf1 · Feb 17, 2010

I can't say for sure if you'll need it. I added one when I converted. If you do need one you can add it and retain the stock speedo and cable. Mine came from a Fox body mustang.

byson1 · Feb 17, 2010

On my EFi conversion I used a motor/wiring/computer from an 93 model automatic equipped Cougar. Without the VSS sensor the engine would stall regularly when coming to a stop. I hooked one up and have not had the problem since. My Bronco has the stock 3 speed manual tranny. It seems that the computer used (auto vs manual) may have more to do with this issue then than the actual tranny used in the Bronco.

68rockcrawler · Feb 17, 2010

I used a VSS on my efi install. When I was researching some people said they didn't have one and didn't need one and other people said they had lots of problems with idle until they installed the VSS. You can get the wiring/speedo adapter from BC Broncos (http://www.bcbroncos.com/store/product_info.php?cPath=24_106&products_id=659)

Terkish · Feb 17, 2010

It seems to be hit and miss if you need a VSS. I am running a EFI and do not have a VSS with no problems. But I know people that had to run one due to stalling when coming to a stop. I don't know why some are fine with out and some need it. I would say put it all together and go for a drive. If you need it they are easy enough to install and you can still use your stock speedo. If you don't need it then great no worries. This is the approach I took. Good Luck.

hrleydavdsonEB · Feb 17, 2010

I have done 3 EFI engine swaps into broncos. 1st 94 mustang 302 and C4 No VSS needed, 2nd 89 mustang 302 and stock 3 spd No VSS needed, 3rd 347 with heads, cam, intakes, injectors all the goodies and an AOD it had to have a VSS or it would die every time you let off the gas. Some need them some don't.

DanWheeler · Feb 17, 2010

A9P computer with 4R70W automatic no VSS needed on mine

chuck · Feb 17, 2010

The VSS in an input to the computer. Ford would not have installed it if they didn't think it was needed. Why not use it?

jw0747 · Feb 17, 2010

not running one on my C4. made no difference...

67EB_in_619 · Feb 17, 2010

Need it? no. Might it make things better? maybe.

76 bronco J · Feb 17, 2010

chuck said:
The VSS in an input to the computer. Ford would not have installed it if they didn't think it was needed. Why not use it?

>>>> for some reason Ford racing/motorsports has no VSS option on their latest one piece harness for EFI conversions , although you could add the 2 wires easily if needed..... Ryan did say this in one of the cons to this harness since it may 'cause stalling ... here's a link to the manual of the M-12071-A50 harness off Ryans site.. http://fordfuelinjection.com/files/M-12071-A50.pdf

66fora69er · Feb 17, 2010

302 HO, A9P and a C4 no VSS, no problems

VSS-do I need it?

av bronco

Bronco Guru

hmh800

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Viperwolf1

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byson1

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68rockcrawler

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Terkish

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hrleydavdsonEB

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DanWheeler

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chuck

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jw0747

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67EB_in_619

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76 bronco J

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66fora69er

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