How do you set the timing on a TBI 454?

The timing should be 0° TDC (454 engines – 4° BTDC). If a change is necessary, loosen the distributor hold-down clamp bolt at the base of the distributor. While observing the mark with the timing light, slightly rotate the distributor until the line indicates the correct timing.

What should the timing be set at on a Chevy 350?

The timing can vary between 2 and 12 degrees BTDC, the recommended spark plugs are different and even the plug gaps vary. In most cases starting out with 12 degrees of initial advance is about right.

What should the timing be on a 454?

The timing on stock 396, 402, 427 and 454 engines is 32-34 degrees total advance at 3500 rpm. This is for an engine with stock camshaft, heads, stroke, and a compression ratio of 10:1. The high-performance versions are slightly higher with a maximum advance of 38 degrees on premium fuel, if the camshaft warrants it.

How do you check the timing on a 454?

The initial timing should be 4 degrees before top dead center (BTDC). If the mark is adjacent to a higher number BTDC, the distributor must be rotated clockwise to bring it down to 4 degrees. If the number is lower or after top dead center (ATDC), turn the distributor counterclockwise.

What happens if ignition timing is too advanced?

Advancing the timing means the plug fires earlier in the compression stroke (farther from TDC). Advance is required because the air/fuel mixture does not burn instantly. It takes time for the flame to ignite the all the mixture. However, if the timing is advanced too far, it will cause an Engine Knock.

How do you adjust the timing on a crank trigger?

Crank Trigger Timing Adjustment

1. Right Side (pass) Mounted Sensor – Move Sensor UP to Retard, DOWN to Advance Timing.
2. Left Side (driver) Mounted Sensor – Move Sensor DOWN to Retard, UP to Advance Timing.
3. Each mark on the MSD Crank Trigger Sensor Mounting Bracket should indicate two degrees of timing.

What is the timing on a Chevy 454?

What rpm do you set timing at?

Rev the engine past the point where your mechanical advance is fully engaged. (Usually, 3,000 – 3,500 rpm will do it.) Watch the timing mark on the harmonic balancer using the timing light.

What should timing advance be at idle?

between 5-20 degrees
Most engines have between 5-20 degrees of ignition advance at idle. This is referred to as initial timing.

Where to set the timing on a 1987 350 TBI?

Should be a single wire behind the electrical center cover on pass side of firewall. Don’t remember on the color. Disconnect this wire to set base time so the computer can’t compensate while you set timing. Other then that wire its same as any other, timing light and timing mark. Brown wire with a black stripe. Its right behind the distributor.

How to reset the idle speed in a GM TBI?

Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM.

How do you change the timing on a fuel injected car?

Connect your timing light to the battery (check polarity), connect the inductive pickup of the timing light to your #1 cylinder as near to the spark plug as possible without toasting it with your exhaust manifold/header. Start your engine and ignore the SES light coming up. Point your light at the timing mark and check your setting.

What are the timing procedures for a MerCruiser engine?

Refer to Specifications – “Engine Rotation and Firing Order,” for cylinder numbering and location. 2. Connect a shop tachometer to engine. NOTE: Before starting engine make sure the timing tab and mark on damper are clean. Chalk or white paint on timing mark on damper may help visibility. 3.