4+3 Deactivate Question

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Nov 10, 2003 | 02:49 PM

YorkL8apex

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Melting Slicks

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From: Poquoson VA

4+3 Deactivate Question

I have a 1987 with 4+3 that I use for AutoCross. It ahs a funtional Overdrive but I do not get an indicator when its on or off. I'd like to have a way to deactivate it during AX.

Anyone found a way to do this? Its easy accidentally to hit the switch during all the action in the car when I'm lost in a sea of cones :confused:

Nov 10, 2003 | 02:51 PM

scorp508

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From: Boston, MA

Re: 4+3 Deactivate Question (York67vette)

There is no indicator that will tell you when the O/D program is on of off. There should be an overdrive engaged indicator right above the 2 digits in your tachometer. If you don't have that then either the LCD pane is not functioning or somebody replaced your tachometer LCD pane with a pre-87 one.

Nov 10, 2003 | 03:05 PM

YorkL8apex

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From: Poquoson VA

Re: 4+3 Deactivate Question (scorp508)

Yeah, I can see the outline of the indicator, looks like it is not functioning. Wondered if it only came on when the OD was engaged? Sounds like that's the case.

Probably just does not engage due to throttle position even if I have it on by mistake during AX.

THanks for the quick response!!

[Modified by York67vette, 3:07 PM 11/10/2003]

Nov 10, 2003 | 03:06 PM

scorp508

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Re: 4+3 Deactivate Question (York67vette)

It definitely "should" come on. Does your overdrive seem to engage properly besides the light coming on?

Nov 10, 2003 | 03:11 PM

YorkL8apex

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From: Poquoson VA

Re: 4+3 Deactivate Question (scorp508)

Yes, it does engage when driven normally. The car is only used for AX and during AX runs things happen a lot by feel. Wearing gloves I'm sure I accidently engage the OD during shifts. Just one more thing to worry about while out there killing cones.

Nov 10, 2003 | 03:20 PM

scorp508

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From: Boston, MA

Is the button on your shifter really floppy and easy to press? If so then you need to replace the spring and probably the overdrive switch also. Mine has a real positive feedback on it and it isn't easy to hit it.

Do you use the OD on long AX courses where a shift is necessary? If you don't want to use it at all you can just unplug the overdrive relay in the engine compartment.

Nov 10, 2003 | 03:40 PM

YorkL8apex

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From: Poquoson VA

Re: (scorp508)

Thanks again, the switch is pretty solid, its just I can't tell if I'm switching it off or on. I also let my Daughter drive the car (she has not yet beat me, but time will tell).

Sounds like I should pull the wire for AX and put it back for high speed stuff. I've only had the car about 6 weeks and raced it onyl twice so far.

Nov 11, 2003 | 03:54 AM

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Re: (York67vette)

The easiest way I know of is to disconnect the overdrive relay. It's located between the brake booster and distributor against the firewall.

There's two there, this one is in front (I think). The other one is the fuel pump relay.