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Had a closer look at that shaft and it looks like it does just push the little valve in on the end of the advance piston. If that is all the stepper motor does it must not move much. So pressure pushes it to retard and then when commanded the stepper motor releases pressure and allows the...

So I should be able to move the shaft attached to the "Flappy Thingy" (thanks I did not know the technical name) and it should move the piston? If so could someone with an IP off the engine remove the TSM and try moving the shaft so I know if mine is seized or not. This would make sense as...

I do not have the pump out of the truck, so it is hard to get at anything for the advance piston. But in the picture where the spring is wrapped around the shaft (# 1 in picture) the TSM connects to that shaft through a spring (not directly to the shaft) When the TSM actuator moves in and...

WOW great thread Bison. I am thinking that I have an Advance Piston sticking problem. How much should I be able to move the shaft in the attached picture from your thread. From what I can see, there are some springs in there affecting the movement. But that shaft only moves a degree or two...

I did not try to turn it but I did try pulling the shaft in and out a few times and it felt rough and then jammed up bad. :banghead:

I do have a spare but I don't want to part with it. I would need it tomorrow if I did. Funny how that works eh!!! I do need the stepper motor and the little ball on the spring that it couples with as it vanished while I was trying to get the shaft that the TSM turns, to turn. If you could...

Thanks Leo, you don't have any old pumps around, do you? I get out to Hanna a fair bit for work. I could get to Castor if need be.

Well the stepper motor needs to be replaced as it is damaged now. :hihi: What I would like to know is, it is trying to drive a spring wound shaft and the shaft on my pump bare rotates either direction. Is this normal? That looks to be the cold advance and is what TimeSet is trying to retard...

Thanks Jim, I have also been pondering getting a old IP and maybe pulling the TSM off it to use and then at the same time I can check what movement should be in the shaft. This is a great old truck and in fantastic shape, with this small problem. If you know of anyone with an old IP that I...

Where is the best place to buy a quality reman IP here in Canada. I am having problems with TDC Timeset and TDC Learn on my truck and it is looking like the pump is the problem. The TSM is broken and needs to be replaced at a cost of about $160.00 but when I took the TSM off and tried to...

No optical filter. If I unplug OS and try to start it it won't, but if I unplug the CPS and try to start it will start and run (not well). With the CPS unplugged maybe the ECM tries to go to base IP timing and with the TSM damaged or disconnected maybe it can't so won't start/run. I do not...

I have got a small mechanics mirror and am going to have a look tomorrow. If that what it is I would have to pull the intake off but the price of repairs would be cheap. When TDC Time Set is commanded it tries to put timing to base IP timing and maybe this is where it is having problems. Got...

Found out it is the fuel solenoid. Another question related to the Timing Stepper Motor. I am wondering if when I had everything apart to do the HG if it is exposed enough that I might have banged it and dislodged something. Maybe that why I can see it move but it is not moving the timing...

I researched some more and found that is the fuel solenoid. The one on the top of the IP is the shut off solenoid. Thanks guys

I have another thread going with IP timing issues but need to know what this connection on the IP is and what do it do?

Oh great IP gurus what is this connection on the IP and what does it do? I was just checking all the connections and the boot is seated properly so I do not know if the electrical connection under the boot is tight.

Not what I wanted to hear, It ran good before the HG job and I could set timing, what could have change or gone bad with IP? If the ECM and chip are compatible enough to give a accurate test I would do it, but the cost of getting it to me and back again good be fairly costly. It would be...

Thanks for the reply AK, Does the ECM have a chip in it now? I wouldn't mind having both because I suspect it must be one of them. Everything we diagnosed before pointed towards the new CPS I put in as a proactive measure. That along with the HG job there should not have been anything else...

AC Delco and Standard part where identical, same number stamped on them. With earlier post where I unplugged the Optical Sensor and tried running with just the CPS (and it would not) I thought we were on to something! Maybe I can do some voltage checks to ECM or if someone has some old parts...

Well after a pause to buy a new Crankshaft Position Sensor, another $70.00. I put it in and get the same results as before. I have moved the IP both directions. The biggest problem is in GMTDScan Tech, when I command a time set it stall the engine, so I can't even see what the "Actual...