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The preface to part 1 the this short article is the you space trying to install a vortec distributor that has actually been gotten rid of without marking its position first. If you have actually not eliminated the distributor yet, that is a wise idea to note the distributor body and rotor position prior to removal so the it can be reinstalled in that postion without having to rotate the engine. Part 2 is universal and also will help you properly set the postion sensor.

Before we start the instructions, we should understand what the video camer sensor does and also why its vital to properly align it. The camshaft postion signal is used by the PCM to identify the postion of the camshaft and verify the intake vs exhaust hit for specific cylinders. ~ above a distributored vortec engine the electronic came sensor additionally helps the PCM control the development and retard of the spark. While cranking, the PCM monitors engine RPM from the crank signal, if after a couple of seconds the cranking without an increase in RPM checked out at the PCM, the computer will assume an improper video camer position (engine stroke) and also assume the opposite punch in an attempt to start the engine. Top top vortec distributored engines girlfriend CAN NOT collection the distributor with a timing light, the PCM is constantly adjusting and also correcting the spark advance, and a timing light will certainly not provide an accurate method to readjust the timing, don"t even waste your time do the efforts it. One improperly set camshaft sensor may set a P1345 DTC code, extended cranking before starting, engine backfire if cranking, and also poor spark control from the PCM which can reason further issues.

Part 1 Installation and also Rough electronic came sensor alignment

Before you download the distributor you need to rotate your engine to top dead center on cylinder 1 compression stroke. To execute this you desire to align the timing note on the crankshaft harmonic balancer v the mark on the timing cover. This marks are situated in the highlighted area of this pic, its not the greatest picture but the just one which mirrors where this marks space properly. This image was bring away while brand-new heads were being installed so the engine is stripped quite a bit.


These marks space aligned at either TDC compression stroke because that cylinder #1 OR cylinder #6. Come verify the it is aligned because that cylinder #1 you can remove your bank 1 valve cover and make sure both the intake and exhaust valves are closed, if they are not, the marks room aligned for cylinder #6, revolve the engine one more 360 degrees and also re-align the marks, the valves must be close up door now and also cylinder #1 is in ~ TDC top top the compression stroke. There space other methods to inspect if the marks space aligned for #1 or #6, but watching the valves is the most accurate.

Now v the engine effectively setup, take her distributor human body without lid or button installed. You will see a #8 stamped top top the rotor right alongside a cutout ~ above the rotor itself. You"ll also see the camshaft place sensor placed on the distributor human body itself. And also cast into the distributor body rim there is a tiny point. Likewise there are windows cut out that the rotor, a larger one, and smaller one, we"ll emphasis on the bigger one. Now that girlfriend have discovered these 4 landmarks (rotor cutout with "8" stamp, postion sensor, large rotor window, and distributor pickled in salt point), and before attempting to install the distributor you"ll want to align the point on the distributor in salt to point at the "8" stamped top top the rotor (where the rotor cutout is), act this will certainly align the electronic came postion sensor directly on the leaf of the big window. View the image below to help clarify all this. You"ll view the point and "8" are aligned and the postion sensor. In this photo I have painted the rotor white, and the postion sensor blue, and also the stamped "8" has actually been composed in black marker, this is simply for comparison in the image, they will not be colored like this on her distributor. Roll your computer mouse over the image for extra clarify on the alignment points.


This alignment is no the ideal alignment, however as you download the distributor the rotor will rotate slightly, this alignment will help provide the proper rough alignment.

Now permitting the rotor wheel to turn freely, download the distributor body right into the engine, the sensor plug receptor top top the distributor body have to be facing around to the rear left of the engine. The rotor wheel should turn clockwise when the distributor gear engagees the camshaft gear. As soon as the distributor body is totally seated it have to be close to the ideal final alignment, yet a slight turbulent adjustment may be necessary. You"ll want to revolve the distributor body so the the camshaft postion sensor aligns itself v the edge of the little lip protruding native the rotor wheel human body as shown below, again roll your mouse over the image for additional clarification.


This is the stormy camshaft alignment. You can lightly tighten under the distributor host down clamp (not also tight if you"re going to be fine tuning the alignment at this point), and install the button, cap, and also wires. V this alignment set properly, the truck must run, and also shouldn"t set the P1345 DTC code.

Part 2 well tuning and final setup of camshaft sensor

In order to fine track the camshaft sensor and lock it down in the fully correct postion you will need accessibility to a scanner i m sorry is maybe to see live data and also read the CMP Retard counter data native the PCM. There are a few scanners that can do this, yet I carry out not have actually an every inclusive list of them, the most common ones that are used for this room the TechII indigenous GM, and EFILive. If you do not have actually a scanner the is qualified of this, you have a few options. Friend can get one, like the EFILive scan tool, or scan and also tune, or after completing the stormy postition alignment from action 1, you have the right to take the van to a shop i m sorry has accessibility to the ideal scanning equipment to have them set it, this should only take a short time come perform, yet most shops have actually a minimum labor charge which have the right to be rather expensive. Due to the fact that there are various scanners which are able to read the CMP offset, the instructions below will it is in generalized and also not certain to any one scanner. If girlfriend require further help, please feel totally free to ask in ours forum.

Okay, prior to you start up the truck, walk ahead and also loosen the distributor host down just A tiny BIT, you want it to store the distributor lightly in place, but not too tight for this reason you deserve to turn the distributor human body by hand. V the turbulent alignment in component 1 complete, her truck should be able to run. Go ahead and start the truck and also let that idle, connect the scanner to her OBDII port, a lengthy cord will be really helpful together you"ll desire to see the data live together you"re trying to collection the electronic came postion. Start up the scanner and connect it to the PCM for this reason it mirrors the live PCM data, make certain it is properly showing the CMP retard counter data. Run the scanner or laptop the end to the engine compartment and find a safe and viewable ar to prop it increase while you gain ready to change the distributor body. Have a friend acquire in the cab and rev and also hold the engine at 1000-1200RPM, if making use of EFILive, the Bidirectional controls deserve to be set to organize the RPM to the value, you desire to store the RPMs above 1000, however not greater than 1200. Watch the scanner data if the engine is organized at the RPM, you"ll see the CMP balance out is a number readout in degrees. You want it come be together close come zero together possible, yet it is really sensitive, for this reason being straight on zero might not it is in possible, anywhere from -2 levels to +2 degrees is within specification. Walk ahead and change the distributor body clockwise or couterclockwise while watching the CMP balance out live data, when you get it set to spec, go ahead and tighten under the distributor host down, store watching the CMP balance out while you tighten it to ensure the the correct setup retained till the distributor is solidly hosted down.

Congrats! girlfriend now have a properly set up and set vortec distributor.

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