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The preface to part 1 the this write-up is the you space trying to install a vortec distributor that has actually been removed without noting its position first. If you have actually not gotten rid of the distributor yet, it is a wise idea to note the distributor body and also rotor place prior come removal so the it can be reinstalled in that postion without having to revolve the engine. Part 2 is universal and will assist you properly collection the postion sensor.

Before we begin the instructions, we should understand what the cam sensor does and also why its vital to effectively align it. The camshaft postion signal is offered by the PCM to identify the postion of the camshaft and verify the intake vs exhaust hit for specific cylinders. On a distributored vortec engine the electronic came sensor additionally helps the PCM regulate the advancement and retard that the spark. While cranking, the PCM monitors engine RPM from the crank signal, if after a couple of seconds of cranking without boost in RPM seen at the PCM, the computer will assume an improper cam position (engine stroke) and assume the opposite punch in an effort to begin the engine. Top top vortec distributored engines girlfriend CAN NOT collection the distributor with a timing light, the PCM is continuous adjusting and also correcting the spark advance, and a timing light will not administer an accurate way to change the timing, don"t even waste your time trying it. An improperly collection camshaft sensor may set a P1345 DTC code, expanded cranking before starting, engine backfire when cranking, and poor spark manage from the PCM i m sorry can cause further issues.

Part 1 Installation and also Rough cam sensor alignment

Before you download the distributor you should rotate your engine to height dead center on cylinder 1 compression stroke. To execute this you desire to align the timing note on the crankshaft harmonic balancer through the note on the timing cover. These marks are located in the highlighted area that this pic, its not the greatest photo but the only one which reflects where these marks space properly. This photo was taken while new heads to be being mounted so the engine is stripped rather a bit.


These marks are aligned at one of two people TDC compression stroke for cylinder #1 OR cylinder #6. To verify the it is aligned for cylinder #1 you can remove your financial institution 1 valve cover and make certain both the intake and exhaust valves are closed, if they room not, the marks are aligned for cylinder #6, turn the engine an additional 360 degrees and re-align the marks, the valves must be closed now and cylinder #1 is at TDC top top the compression stroke. There space other methods to examine if the marks space aligned because that #1 or #6, but watching the valves is the most accurate.

Now v the engine properly setup, take your distributor body without cap or button installed. You will see a #8 stamped top top the rotor right next to a cutout top top the rotor itself. You"ll likewise see the camshaft place sensor placed on the distributor body itself. And cast into the distributor human body rim there is a little point. Additionally there space windows reduced out the the rotor, a larger one, and also smaller one, we"ll emphasis on the bigger one. Currently that friend have discovered these 4 landmarks (rotor cutout with "8" stamp, postion sensor, huge rotor window, and distributor pickled in salt point), and before attempting to download the distributor you"ll desire to align the allude on the distributor in salt to suggest at the "8" stamped top top the rotor (where the rotor cutout is), act this will align the cam postion sensor straight on the leaf of the large window. Check out the image below to assist clarify every this. You"ll watch the allude and "8" space aligned as well as the postion sensor. In this snapshot I have actually painted the rotor white, and also the postion sensor blue, and also the stamped "8" has actually been created in black color marker, this is simply for comparison in the image, they will certainly not it is in colored favor this on your distributor. Role your mouse over the image for extra clear up on the alignment points.


This alignment is no the appropriate alignment, yet as you download the distributor the rotor will revolve slightly, this alignment will help carry out the suitable rough alignment.

Now enabling the rotor wheel to rotate freely, install the distributor body right into the engine, the sensor plug receptor ~ above the distributor body have to be facing approximately to the behind left of the engine. The rotor wheel should turn clockwise as soon as the distributor gear engagees the camshaft gear. When the distributor human body is totally seated it should be close to the ideal final alignment, but a slight turbulent adjustment might be necessary. You"ll desire to revolve the distributor body so the the camshaft postion sensor aligns itself with the leaf of the small lip protruding native the rotor wheel human body as displayed below, again roll your mouse over the photo for more clarification.


This is the turbulent camshaft alignment. You have the right to lightly tighten down the distributor hold down clamp (not too tight if you"re going to be fine tuning the alignment in ~ this point), and also install the button, cap, and also wires. V this alignment set properly, the truck have to run, and shouldn"t set the P1345 DTC code.

Part 2 fine tuning and also final setting of camshaft sensor

In order to fine tune the camshaft sensor and also lock it under in the totally correct postion you will need access to a scanner i beg your pardon is may be to see live data and read the CMP Retard balance out data native the PCM. There space a few scanners that have the right to do this, but I do not have an all inclusive perform of them, the most usual ones the are supplied for this are the TechII native GM, and also EFILive. If you execute not have actually a scanner the is qualified of this, you have a few options. Friend can acquire 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 beg your pardon has access to the ideal scanning devices to have them set it, this need to only take a quick time to perform, yet most shops have a minimum labor charge which deserve to be quite expensive. Due to the fact that there are various scanners which are able to check out the CMP offset, the instructions listed below will it is in generalized and not details to any one scanner. If friend require further help, you re welcome feel free to asking in our forum.

Okay, prior to you start up the truck, walk ahead and loosen the distributor organize down simply A tiny BIT, you desire it to store the distributor lightly in place, but not also tight therefore you deserve to turn the distributor human body by hand. Through the stormy alignment in part 1 complete, her truck should be able to run. Go ahead and also start the truck and let that idle, attach the scanner to her OBDII port, a long cord will be really helpful as you"ll want to watch the data live together you"re do the efforts to collection the camer postion. Begin up the scanner and also connect it come the PCM therefore it reflects the live PCM data, make sure it is effectively showing the CMP retard balance out data. Operation the scanner or laptop the end to the engine compartment and also find a safe and also viewable place to prop it up while you get ready to readjust the distributor body. Have a friend acquire in the cab and also rev and hold the engine in ~ 1000-1200RPM, if making use of EFILive, the Bidirectional controls have the right to be collection to host the RPM to the value, you desire to store the RPMs over 1000, however not greater than 1200. Clock the scanner data if the engine is held at that RPM, you"ll see the CMP balance out is a number readout in degrees. You desire it come be together close come zero as possible, however it is really sensitive, so being directly on zero may not be possible, anywhere from -2 degrees to +2 levels is in ~ specification. Walk ahead and change the distributor human body clockwise or couterclockwise when watching the CMP counter live data, when you obtain it set to spec, walk ahead and also tighten down the distributor organize down, keep watching the CMP balance out while friend tighten it to ensure the the correct setting retained till the distributor is solidly organized down.

Congrats! friend now have actually a properly installed and set vortec distributor.

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