The rotor inside the distributor should be pointing at the #1 spark plug.
If you turn the engine to TDC on the compression stroke, the distributor rotor will point at the terminal for #1. Most distributors have a mark (usually a 1) on them under the cap to indicate the #1 position for the rotor to point at. The cap tower directly above the rotor point at this position is for the #1 spark plug.
rotor should point at number 1 plug lead when engine is at tdc make a mark with whiteout ,on outside of distributor before you remove distributor cap. make this mark where the #1 spark plug lead would be if distributor cap was on distributor when you remove cap this is where rotor needs to be pointing
CAMSHAFT POSITION SENSOR The camshaft position sensor is located in the distributor on all 3.9L V-6 and 5.2/5.9L V-8 engines Camshaft Position Sensor REMOVAL Distributor removal is not necessary to remove camshaft position sensor Remove air cleaner assembly. Disconnect negative cable from battery. Remove distributor cap from distributor (two screws) Disconnect camshaft position sensor wiring harness from main engine wiring harness. Remove distributor rotor from distributor shaft. Lift the camshaft position sensor assembly from the distributor housing Camshaft Position Sensor INSTALLATION Install camshaft position sensor to distributor. Align sensor into notch on distributor housing. Connect wiring harness. Install rotor. Install distributor cap. Tighten mounting screws. Install air cleaner assembly.
For a 1991 Chevrolet Blazer with 5.0L, 5.7L and 7.4L engines the firing order is 1-8-4-3-6-5-7-2 The distributor rotation is clockwise. Here's a web page with a wiring diagram: http://www.chuckschevytruckpages.com/underhoodwiring.html
A miss or a missfire is when the spark plug does not create a spark or sparks at the wrong time. Causes of a missfire are: worn out spark plugs, bad spark plug gapping, bad or broken spark plug wire(s), worn out distributor cap and or rotor, bad ignition coil, worn gears on the distributor or camshaft, worn out timing chain/belt, for computer controlled engines the coil pack(s), ignition module, cam sensor, knock sensor, oxygen sensor, ecm, throtle position sensor, idle air control valve just to name a few (depends on manufacturer and model).
What is spark plug's position? tell me.
On the 305 engine the number one plug position is the first one on the right side while you are facing the engine.
I am assuming you have the 2.0L? If so this is a distributor-less engine with coil over plug ignition. The spark signal comes from the crankshaft position sensor.
it should be right behind T.B.I unit....just follow your spark plug wires from block to..distributor and there it is....
If you will remove the #1 plug, (driver's side front of engine), then turn that cylinder to top dead center, (TDC), on the compression stroke, you can then remove the distributor cap and look at the rotor. The rotor will now be pointing to the #1 plug position. GET THE NUMBER ONE CYLINDER TOP DEAD AND THE ROTOR IN THE DISTRIBUTOR SHOULD BE PIONTING AT IT
That's not really what's going on. The coil makes the spark, the distributor distributes the spark to the correct plug. If the distributor is not in the correct position, the spark does not go to the correct plug, or goes to the correct plug at the wrong time.
Assuming this is a 4.3L engine, standing in front with the hood open, looking at the distributor, #1 would be at the 5:30 position.
The number one plug is the one on the drivers side front of the engine. Therefore the plug wire connected to that plug is number 1 and where it connects to the distributor is the number 1 position on the distributor. If you have removed all the plug wires then you will have to remove the spark plugs, turn the engine over until the number 1 cylinder is at top dead center (TDC) on the compressions stroke. Once it is at TDC then the rotor inside the distributor will be pointing to the number 1 position.
that should have the HEI distributor so the plugs should be set at .045
It is in the very back of the engine. Just follow a plug wire from the spark plug to the distributor cap. It is hard to see. All the plug wires start at the distributor and then hook to each plug.
If the engine is EFI you must unplug the 4 wire plug behind the distributor before starting. Then rotate the distributor while using a timing light to the correct position. If the engine is NON EFI then you must unplug the vaccum line from the distributor and adjust the same way. You should plug the line off to avoid a high idle situation as well..
It should be the same as the small block.18436572.