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firing order for 5.7 v8 is 1-8-4-3-6-5-7-2 mostly all of the chevy v8s are the same firing order. the rotor button in distributer turns clockwise, the cylinder numbers are 1-3-5-7 on drivers side, 2-4-6-8 is on passengers side. To get started get your distrutor cap[new one] look on the top you will see a #1that's where you begin you must know if if rotates clockwise or counter clockwise start in that direction then follow the firing order and cylinder line up. good-day!! if cap is not marked, just pull out #1 plug, put a straw or similar in plug hole on top of piston. turn engine over by crank in front of vehicle with a wrench, when the piston comes to the very top just before it starts going down. this is tdc. and rotor button should be pointing to #1 wire on dist, cap. follow from there. good-day !!
FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.
Fig. 1: 1988-95 4.3L Engines
Firing Order: 1-6-5-4-3-2
Distributor Rotation: Clockwise
Fig. 2: 1996-98 4.3L Engines
Firing Order: 1-6-5-4-3-2
Distributor Rotation: Clockwise
Fig. 3: 1988-95 5.7L and 7.4L Engines
Firing Order: 1-8-4-3-6-5-7-2
Distributor Rotation: Clockwise
Fig. 3: 1996-98 5.7L and 7.4L Engines
Firing Order: 1-8-4-3-6-5-7-2
Distributor Rotation: Clockwise
Replace the coolant sensor on the front of the intake manifold.The coolant sensors on this engine does go bad and wont set a check engine light. The sensor will read about -32 to 0 degrees when they do go bad. The computer thinks it is that cold and sends tons of fuel to the engine. If you try to start the engine with the throttle depressed to the floor it puts the fuel system in clear flood mode and wont fire the injectors. Engine will start then and run very rich. The coolant sensor has two wires on it and sometimes you need to replace the wiring pigtail going to it as the sensor can seep coolant into the connector and corrode the terminals. All the parts are available at pepboys and autozone or napa. Good luck
Firing order is 1-8-4-3-6-5-7-2. #1 usualy points to the #1 cylinder
thats front driver side of engine
On the cap. Remove the number 1 spark plug and have someone crank a
little unitl you hear/feel air. The possition of the rotor is where
your number 1 is, go Clockwise to place the wires in the correct order.
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