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Advancing timing...

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Old Feb 16, 2007 | 12:35 AM
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Advancing timing...

Guys when I advanced my truck from 10* to 15* btdc I wasn't getting any pinging at idle, but when I was putting the truck under a load the truck was pinging. Is there anyway of advancing the timing just right where you don't have to drive the truck on the highway to put the engine under a load? I even powerbraked in the driveway with the timing at 15* and it didn't ping you think that would have been a load for the engine? What is the best way to accurately time an engine besides putting a light on it? You should hear pinging when just idling right?
 
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Old Feb 16, 2007 | 04:07 AM
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what year truck? if fuel injected, did you unplug the SPOUT wire? did you use a timing gun, or by ear? There is no other way to accurately time an engine without putting a light on it.
 
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Old Feb 16, 2007 | 06:26 AM
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It will be very unlikely that the engine will ever ping at idle. You have to load the engine to have any idea of whether or not it is going to ping. I would have thought you would notice while power braking, but if it only pings on the highway, then that's where you need to check. Make sure that it doesn't ping where you know it is likely to ping, if that makes any sense.
 
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Old Feb 16, 2007 | 07:48 PM
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I have timed the engine already putting a timing light on it, but I was looking for a better way of timing possibly...
 
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Old Feb 16, 2007 | 07:51 PM
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the question still is: did you pull the spout off?

what are you looking for?

the need to use more expensive fuel?
 
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Old Feb 16, 2007 | 07:52 PM
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Yep I go by the book on timing, so yes I did pull the spout and set the timing to 13* btdc with the spout out and then I put the spout in...
 
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Old Feb 16, 2007 | 10:09 PM
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Originally Posted by Jrock909
Yep I go by the book on timing, so yes I did pull the spout and set the timing to 13* btdc with the spout out and then I put the spout in...
So does it ping on the road set at 13deg? It's my experience that the SD trucks will not tolerate much advance, some no more than 1-2deg above 10. The mass air system does a better job of keeping the A/F ratio consistent across the engine load range. It is also very engine specific, any sharp edges or casting defects in even 1 combuston chamber can make a motor prone to detonation.
 
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