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Discussion Starter #1
Yeah I tried the newbie general 4x4, I never go there so I figure it doesn't get much traffic.

This is a '94 454 TBI

How do I set it? I can't figure out which wire to disconnect to get it into bypass mode. There are two plugs going into the distributer, one with 2 wires that go to the coil, the other with 4 wires that goes to the computer. I was instructed to unhook the tan wire that goes to the firewall. There is no such wire. There is a tan/black stripe wire in the plug with 4 wires. But there is no way to only disconnect that one wire. The manual says to disconnect the timing wire that comes out of the wiring conduit next to the distributer. I don't see any such single wire.

Thanks in advance
 

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Ill see if i cant look it up in my books. Odds are somone selse will reply before i do that tho.
 

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Discussion Starter #3
Supposedly there is a connector on the tan/black wire either by the firewall or behind the glove box. My truck had neither so I put a connection on the wire behind the glove box. Problem solved.
 

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It is either in the harness under the cover for the relays on the right side of the firewall or under the glove box near the heater. Hope this helps. Brett
 

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There is a much simpler way to do the timing on a TBI. Set the timing to where you want, no need to disconnectany wires. When you get it where you want, disconnect the battery for about a minute or so. Put the cable back on and your timing is set. Diconnecting the cable resets the computer, and adjusts itself.
 

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b454rat said:
There is a much simpler way to do the timing on a TBI. Set the timing to where you want, no need to disconnectany wires. When you get it where you want, disconnect the battery for about a minute or so. Put the cable back on and your timing is set. Diconnecting the cable resets the computer, and adjusts itself.

this is incorrect to set your initial timing.If you knew what your total wanted to be at a certain rpm,maybe this would work.But, you would never knoww hat you initial was set at unless you disconnected the timing connector. You could end up being completly out of the timing map. Brett
 

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Well, a freind of mine is a mechanic, he was the one who told me about it, and I done it numerous times, and never had any probs. There's not a vacuum advance on these, so what other timing can use adjust??
 

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the ecm bases all adjustments based on 4 degreesBTDC. By your method, how does the ecm know that the timing was set at 4 btdc before making adjustments? It wouldn't. That is why you need to disconnect the timing connector, adjust the timing to spec(4 degrees on this aplication), reconnectt he connector and let the ecm take over. If you adjust it any other way, there is no baseline. The timing map is based on this procedure. With your method, you could end up with 20 degress initial timing, and the computer would keep advancing timing out of the desired range. You probbaly got luck in the past.
Let say you had just installed the dist in the vehicle. If the timing was adjusted by your method to 4 degrees with the timing connector connected, the timing would be very retarded.

Brett
 

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That could be possible. We set the timing by a light, then disconnected the battery. When i put my motor in, I set the distributor at number 1, and did the rest by ear and idle. Maybe then I got lucky too, but that thing ran awesome. If it had a good tranny it would smoke them into third gear. Would pin you back in the seat in any gear. Well, maybe not o/d. Whatever way works, I guess....
 

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Discussion Starter #11
b454rat said:
If it had a good tranny it would smoke them into third gear. Would pin you back in the seat in any gear. Well, maybe not o/d. Whatever way works, I guess....
Granted my motor runs well and it will spin them in 1st (NV4500) but not in 2nd. This truck has 4.10's too. The motor has 90K on it.

You guys have any tuning tips for me?

Here's what I've done so far:

-K&N, removed resonator replaced with 4" PVC to the fender. (I like the soound of the TBI at wide open). Made sure the restrictive peice inside the fender was gone.
-Set timing to 8 degrees (this made the biggest difference so far)
-Basic tune up
-I'm going to cut the cat off and replace the muffler with some free flow unit.
-New double roller t-chain
-HV oil pump

Since this is a tow rig, I'm not investing in any high dollar items like headers for a awhile, but that being said I can't wait to put a good set of heads, cam, intake, chip and headers on this thing :D

Any other tips for tuning this thing would be great.
 
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