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How do you set the timing on a 1987 GMC pickup with a throttle body injected 350 engine?
Wiki User
∙ 13y ago
Timing specification6°
NOTE: Timed at number 1 cylinder with Electronic Spark Timing (EST) connector (tan wire with black stripe) disconnected. The EST connecter is located in the engine compartment adjacent to the distributor.
CAUTION: Always check the underhood emissions label (if available). Specifications and procedures on the underhood emissions label supercede all others.
TIMING ADJUSTMENT PROCEDURE: See: Ignition Timing
Wiki User
∙ 13y ago
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Do you have to unplug the brown wire on a 1986 Chevy Pickup when setting the timing?
1986 should be carburatored and it is not required. That would only apply to a fuel injected engine.
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wich engine do you have?
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yes
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A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).
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