I had a problem over the weekend that resulted in a no start. Replaced crankshaft sensor,fuel pump (pressure below 48psi) then ignition coil and module. While I was working on it I installed a new billet distributor I've had for months. Once I got it to start it threw a P1345 code so I figured I somehow messed up installing the distributor. Removed, located TDC?, reinstalled and the exact same code! It is showing the timing advanced 20 degrees on my Autotap setup also. Tried removing dist. and installing 1 tooth retarded (CW) and she won't start. I'm baffled and more than confused about the TDC on my engine, I've read that there should be two marks on the timing cover and two on the balancer but my balancer only has one mark. I'm locating TDC by feeling for comp. at #1 and rotating til top mark on cover is aligned with mark on balancer. I've done this over 6 times with it still throwing code and showing 20 degrees advance! I even tried another distributor and got the same results. Took it to a reputable shop and they tried all of the above and told me to somehow modify the hold down so that I can retard the distributor! Any expert advise? Suggestions?
Thx D

Can someone at least tell me if the camshaft/crankshaft relearn is the same as setting the camshaft retard? I don't remember the brand of scan tool(it was blue and gray) but I never enter an area that allowed camshaft retard adjustment. All the mechanic kept doing was going threw and trying the relearn instead of adjusting the camshaft retard. I explained to the shop exactly what I needed and now I'm wondering if they were competent.

Go to EFIConnection.com and look under the 24x section. There is a how to on setting up the CMP sensor. It shows where the 1x reluctor needs to be positioned with the engine at TDC. Crank relearn/corrolation is not the same as CMP offset. Not all scanners show CMP offset.

Jeff

Lextech wrote:

Go to EFIConnection.com and look under the 24x section. There is a how to on setting up the CMP sensor. It shows where the 1x reluctor needs to be positioned with the engine at TDC. Crank relearn/corrolation is not the same as CMP offset. Not all scanners show CMP offset.

Jeff

bingo, follow Mike's instructions for stabbing the dist on the eficonnection site. then you need to get a scanner that reads cmp retard offset, and you need to set that to 0* +- 2* with the engine around 1000-1200 RPM.

I saw this earlier today, so this procedure supersedes lining up rotor with 8indention? What does CMP stand for?

dracoskeeper wrote:

I saw this earlier today, so this procedure supersedes lining up rotor with 8indention? What does CMP stand for?

stabbing the dist is very precise on these, its not as simple as just pointing the rotor in the general direction and using a timing light like on the older motors, adjusting the dist is VERY sensitive. it can get out of spec just by tightening the hold-down. if you follow the eficonnection directions, you'll get it close enough to run, you may even get it close enough to not set the code off, but to do it 100% correct you need to get a scanner and set the cmp offset as well.

CMP retard offset = camshaft position retard offset. since the timing on these motors is fully PCM controlled, its how we set the cam position sensor correctly. I know efilive and the Tech 2 scanners can read the cmp offset, I've also heard that some verson of teh autotap might be able to as well as some snap on scanner also, but I'm not sure on those.

dracoskeeper wrote:

I saw this earlier today, so this procedure supersedes lining up rotor with 8indention? What does CMP stand for?

Doesnt really superscede, just a different method as the 24x reluctor installs dont use a rotor at all because the distributer is solely used for a camshaft sensor signal, not for distributing electricity from the coil. Cant line up a rotor if it's not there.

Basically you need to get the distributer/CMP sensor gear and cam gear mesh correctly, then once the gears are meshing correctly, you can clock the distributer base to get you within + or - 2º on theV8's.

Some of the brick Snap On scan tools will read CMP retard as well to the ones listed above.

CMP=Camshaft position
CKP=Crankshaft position

peace
Hog

I want to thank everyone!! Did the reinstall with my distributor, using the method above and no codes! I'm trying to figure out what the CMP retard reading on my Autotap means because it is not in degrees. If I can't I'll have my brothers shop set the CMP offset to 0. At least the shop refunded most of the money for the work they couldn't get right and the new distributor that I did not need. Any recommendations for a good used scan tool that will allow me to set CMP offset? Thx again.

dracoskeeper wrote:

Any recommendations for a good used scan tool that will allow me to set CMP offset?

That is the problem----There aren't many scan tools that will read CMP offset. Aloicious named the ones that will read it. I am not sure of any others. If you are planning on doing any tuning on your truck---I would recommend EFILive. It is an excellent tuning/scanning/logging setup. The V2 unit will work on 98 and up trucks. 97 and earlier trucks are not supported by EFILive. If you did the 0411 PCM swap you could use the less expensive V1 unit. The V1 is a great unit and will do everything you could want---The V2 is just the latest and greatest and will work on 98 and up trucks with the original PCM.

Jeff

Lextech wrote:

dracoskeeper wrote:

Any recommendations for a good used scan tool that will allow me to set CMP offset?

That is the problem----There aren't many scan tools that will read CMP offset. Aloicious named the ones that will read it. I am not sure of any others. If you are planning on doing any tuning on your truck---I would recommend EFILive. It is an excellent tuning/scanning/logging setup. The V2 unit will work on 98 and up trucks. 97 and earlier trucks are not supported by EFILive. If you did the 0411 PCM swap you could use the less expensive V1 unit. The V1 is a great unit and will do everything you could want---The V2 is just the latest and greatest and will work on 98 and up trucks with the original PCM.

Jeff

EFILive scan is supposed to work on the 96-97 Vortecs, not sure about the enghanced GM PID's.

peace
Hog

Hog wrote:

Lextech wrote:

dracoskeeper wrote:

Any recommendations for a good used scan tool that will allow me to set CMP offset?

That is the problem----There aren't many scan tools that will read CMP offset. Aloicious named the ones that will read it. I am not sure of any others. If you are planning on doing any tuning on your truck---I would recommend EFILive. It is an excellent tuning/scanning/logging setup. The V2 unit will work on 98 and up trucks. 97 and earlier trucks are not supported by EFILive. If you did the 0411 PCM swap you could use the less expensive V1 unit. The V1 is a great unit and will do everything you could want---The V2 is just the latest and greatest and will work on 98 and up trucks with the original PCM.

Jeff

EFILive scan is supposed to work on the 96-97 Vortecs, not sure about the enghanced GM PID's.

peace
Hog

yeah back before I purchased V1, Justin at blackbear told me that I should be able to SCAN a 96-97 blackbox PCM with EFILive, but it won't be able to tune it at all.