C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

85 ignition timing, help please

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Old Aug 18, 2001 | 10:22 PM
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Secret Squirrel's Avatar
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Default 85 ignition timing, help please

I've looked at the manual and also the underhood sticker, these claim that you must disconnect a "tan wire with blak tracer" that comes out of the loom somewhere near the distributor......For the life of me i cannot find this wire:confused:
Is the "tan" colour more brown than tan?, is the wire thick, thin and what colour is the connector and what type of connector? One other thing....this car has been converted to right hook, but i know the guy who done it and i don't think he would have barstardised the wiring loom with different colours.

Any help appreciated, this is starting to wear me down :mad

Cheers
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Old Aug 18, 2001 | 11:28 PM
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Default Re: 85 ignition timing, help please (Secret Squirrel)

It is a single wire (brown) with a plastic disconnect. Close to the windshield wiper motor (driver side of the engine). May be buried next to the valve cover.

Good hunting !!
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Old Aug 18, 2001 | 11:31 PM
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Default Re: 85 ignition timing, help please (Secret Squirrel)

OK, in a stock location, the wire snakes up near the brake booster. I am guessing right hook means drivers side on the right hand side of the car, so if I am wrong, well, it will only be the 98th time today. IF it has been swapped then instead of telling you where the wire is, it might be easier to tell you where it comes from.

The distributor has 2 sets of wires coming out just beneath the cap. One set is from the condenser and can be identified as the bundle that goes to the + C - markings on the cap, just behind the tach and bat terminals. That isn't the bundle you want.

The bundle you want to follow is most likely coming out the bottom of the distributor on the firewall side. It will have 4 wires on it. I would say there is about a foot of wire (about 30.48 cm if it pleases you ;) ) and then there is a flat 4 wire weatherproof connector. The wire colors in that connector are likely purple/white, white (mine has turned yelow with age), black/red, and a tan/black. My tan/black looks more like orange/black and the black is pretty light. Follow that tan/black wire (by ruling out the other 3) and about 45 cm later there should be a connector that looks just like the one that plugs into the O2 sensor. That is the one.

You will get a code 42 and remember to do the timing when the car is warmed up (and keep the wire connected till it is warmed up). Set your timing, turn off your car, plug the connector back in, disconnect the battery for a few seconds to clear the code, close the bonnet, fire it up and make sure that timing is more than what you set it at. The computer will add anywhere from 0-30 degrees at idle depending on conditions. Good luck, -Matt-
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Old Aug 18, 2001 | 11:39 PM
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Default Re: 85 ignition timing, help please (vett4cw)

It is a single wire (brown) with a plastic disconnect. Close to the windshield wiper motor (driver side of the engine). May be buried next to the valve cover.

Good hunting !!
Found it I've been looking all morning and had no luck till now.

Thank's very much for the help CW :cheers:

Thanks also HighHopes85 :cheers:


[Modified by Secret Squirrel, 1:42 PM 8/19/2001]
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