JeepsAndGuns
12-12-2011, 02:56 AM
So this morning I did the coldest start I have done since installing my fuel injection. It has been down to about 32 degrees last night, but was up to about 35 when I started it this morning.
When I cranked it over, it kinda cranked and then stopped for a second and then cranked for another second then stopped and finished cranking. Kinda hard to discribe, but the best way I can do it, is its like when you have had the distributor out of a engine and you reinstall it and you have to guess where it should be to get it to crank and run enough so you can set it with a light. And if you have it turned too far one way, it fires too far advanced and the piston is kinda fighting to compress the burning air/fuel. Anyone understand what I am saying? The thing it did was exactly like engines have done when I have done that and had the distributor turned too far advanced.
Once it started all was fine, and all other times cranking before and since have been fine too. But like I said, this is the coldest its been when I have started it. I know there are settings and paramiters that add spark advance when the engine is cold, is there one that adds addional advance based on how cold it is only when cranking? Once started it was fine, but when it was actually cranking is when it was having trouble. So is there something that adds advance only when cranking?
I have found one table called "startup spark vs. tempature" Would this be used when cranking the engine? It has 32*c as 10.9 degrees, and 8*c as 13.0 degrees. So then it was adding between 10 and 13 degrees of advance when cranking? The advance drops to 4.9 at 56*c and 1.8* at 80*c and 0 from there on up. As temp continues down, it adds even more, up to 14.1 degrees at -40*c. So if this table is in fact used only when cranking, I think its adding too much advance. I have more advance than a stock chevy engine, so I think thats why this needs to be adjusted.
If this is not correct, then can someone point me in the right direction? I just dont want to change it untill I know what I am changing, and that I am chaning the correct things.
When I cranked it over, it kinda cranked and then stopped for a second and then cranked for another second then stopped and finished cranking. Kinda hard to discribe, but the best way I can do it, is its like when you have had the distributor out of a engine and you reinstall it and you have to guess where it should be to get it to crank and run enough so you can set it with a light. And if you have it turned too far one way, it fires too far advanced and the piston is kinda fighting to compress the burning air/fuel. Anyone understand what I am saying? The thing it did was exactly like engines have done when I have done that and had the distributor turned too far advanced.
Once it started all was fine, and all other times cranking before and since have been fine too. But like I said, this is the coldest its been when I have started it. I know there are settings and paramiters that add spark advance when the engine is cold, is there one that adds addional advance based on how cold it is only when cranking? Once started it was fine, but when it was actually cranking is when it was having trouble. So is there something that adds advance only when cranking?
I have found one table called "startup spark vs. tempature" Would this be used when cranking the engine? It has 32*c as 10.9 degrees, and 8*c as 13.0 degrees. So then it was adding between 10 and 13 degrees of advance when cranking? The advance drops to 4.9 at 56*c and 1.8* at 80*c and 0 from there on up. As temp continues down, it adds even more, up to 14.1 degrees at -40*c. So if this table is in fact used only when cranking, I think its adding too much advance. I have more advance than a stock chevy engine, so I think thats why this needs to be adjusted.
If this is not correct, then can someone point me in the right direction? I just dont want to change it untill I know what I am changing, and that I am chaning the correct things.