timing advance q's
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timing advance q's
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?
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Originally Posted by PLC7.3
I think you need to dial in a 20* offset do you have that availability on your adapter.
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From: KY
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?
Did you get this off of the truck or by it used?
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Originally Posted by catfish101
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?
Did you get this off of the truck or by it used?
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From: KY
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.
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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
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From: Powell River B.C.
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.
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.
Last edited by KJLYPW; Nov 7, 2007 at 08:48 PM.
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From: Conway, AR
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
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
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