just bought a snap-on diesel probe adapter and decided to try it out on my 94 f350 turbo idi.warmed engine up to operating temp hooked it up and attached my craftsman inductive pickup light to it. well it seems to work flawlessly but i have some q's.first off my initial timing at idle at the crank shows that the mark on the balancer lines up with the left end of the plate on the engine looking down at the engine.when i start to rev it it moves a little bit to the left but then as the rpms start to increase more (about 1200 according to my dash tach) it starts to go back to the right and stays about an 1/8 of an inch to the left of the 0 mark. it seems like the pump isnt advancing it like it should. i have no smoke issues or starting problems. is it time for a new pump or is it the injectors? or is this a normal timing curve for the turbo idi's? what kinda of timing curve should i be looking at? am i doing anything wrong?

 

I think you need to dial in a 20* offset do you have that availability on your adapter.

 

i thought you only had to do that with the luminosity type probe,the one i have is the pulse type where it picks up pulses off the #1 fuel line. i thought you just hook up a standard inductive pickup timing light to it.

 

anybody? i could really use the help as the nearest diesel repair shop from here is 40 miles. even they wont give me a straight answer.

 

My guess would be that the timing light isn't picking up the probe signals. I know when I checked on one a few years ago off of the Mac truck he mentioned that they wouldn't work on all lights. Thats is what he was in the understanding of.

Did you get this off of the truck or by it used?

 

i bought it used,it seems to be working normally. at idle it shows what i would guess to be about 6 deg. atdc,but the pump doesnt seem to be advancing the timing any after the rpms increase.my cold start advance is working(checked that this morning advances timing 1 degree,unplug it goes back) what i am wondering is what is the timing map supposed to look like with this particular pump in comparison to engine rpm. should it keep advancing the timing as the rpms increase? should timing be more advanced at idle than at 2000 rpm? or vice versa? i seem to have more advance at idle than i do at 2000 rpm. am i not doing something that i should be? i just hooked up the pulse adapter according to the instructions it came with. my timing light doesnt measure advance but it is a good quality older craftsman light(inductive of course). seems to me that the pump should be advancing more as the engine rpms increase. or am i wrong?

 

Hey try this, With the motor idling move the advance piston with a screw driver. Pry the top of the arm out and see if it will advance then. It should and the motor sound should change some.

 

Catfish...is that the piston on the drivers side, at the bottom of the injector pump, with a lever that goes up the side of the pump??? Also..is there any negative effects of advancing the pump too far. I bought a truck that was very sluggish and smoking. I found the injector pump marks not lined up correctly. After lining the marks(advancing the pump) it runs great and has TONS more power!!! that led me to advance it a little more...and more power was found. I don't want to over do it. It starts alot better now

 

The target plate on the front of the engine is offset by 20*. With my Kent Moore timing meter I found that at idle 640 rpm timing (pulse method) is at 14.4* BTC, then at 2000 rpm it retards to 8.5* BTC.
At this piont you will get a slight rattle to the engine as you accelerate when the cold advance is still on. After the advance cuts off, the rattle will be gone.

 

You're going to need an advance type timing light for that setup to work properly.
Set the light for 8.5 and have someone hold the rpms at 2000 ( engine warm and the timing mark should line up at the 0 mark on the timing tab. There are 2 marks on the tab with two holes for other type timing devices, one is offset.
At lower RPMS the pulse adapters tend to scatter around a bit but the advance does seem to retard a bit at 2k rpms
I've got a ferret pulse adapter , it works about the same.

--------Robert