What happens when remove timing wire when engine is running
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Joined: Apr 2011
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What happens when remove timing wire when engine is running
I have a 91 tbi 305. When I was setting the timing I removed the tan cable while the engine was running. Now it feels like I don't get any advance. Also I don't have any codes. Only when I disconnect the wire. I change the est. Still the same thing. Will winadla tell me anything about me timing. If it working.
Senior Member
Joined: Sep 2009
Posts: 516
Likes: 1
From: Downers Grove, IL
Car: 91 Z28 / 04 GTO
Engine: GMPP 350 TPI / LS1
Transmission: WC T5 / T56
Axle/Gears: 3.23 / 3.46
Re: What happens when remove timing wire when engine is running
you unplug the tan wire with the black stripe to set the base timing. 6-8 BTDC then plug the wire back in and check for auto advance, you might see as much as 20 BTDC but i'm more familiar with tpi. hope that helps
Supreme Member
Joined: Sep 2002
Posts: 9,192
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From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: What happens when remove timing wire when engine is running
Isn't 6-8 BTDC a little high for a stock TBI car? Base factory setting is zero. I've seen folks go to about 4 BTDC, but never 6-8 on a stock motor. But I'm no expert either.
Your supposed to unplug the EST wire BEFORE you start the car. Unplugging it whiole it's running will cause the car to act weird, because you yanked away the computer control of the timing without and warning. If you unplug BEFORE you start the car, then the computer "knows" what your doing and doesn't try to compensate with fuel changes.
Disconnect your batt cable for 5 minutes, to clear all the ECM memory - then reconnect batt cable, unplug the EST BEFORE you start the car, and check/adjust timing correctly.
Your supposed to unplug the EST wire BEFORE you start the car. Unplugging it whiole it's running will cause the car to act weird, because you yanked away the computer control of the timing without and warning. If you unplug BEFORE you start the car, then the computer "knows" what your doing and doesn't try to compensate with fuel changes.
Disconnect your batt cable for 5 minutes, to clear all the ECM memory - then reconnect batt cable, unplug the EST BEFORE you start the car, and check/adjust timing correctly.
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