c4boom

hay i would like it if some one would help me understand my knock table . this is the knock table from my 747 ecm in my truck. this table is from scaning for about 2 hours of data

dimented24x7

iTrader: (2)

Theres a strong chance the 188 may be jsut from startup if you started datalogging before you started the engine. Youd have to watch the table to see if the counts kept advancing.

Looks pretty typical. There is some reported knock around the areas of high load. Each one of those cells is actually knock/256 so if you multiply them by 256 thats teh actual number of knock counts reported.

Maybe you could try reducing teh timing a degree or two around those areas and see if you can reduce the knock there.

c4boom

man do you ever take a brake i hope you can get you car running soon then you will have some thing besides hellping me out to do. thank you .

and so is that alot of knock and y would it be there with a stock timing curve

dimented24x7

iTrader: (2)

Eh, its not alot of knock but in some places in the timing curve there can be too much timing. Have you changed your base timing any? Also a lack of AE or a lean fuel mixture can also cause detonation.

dimented24x7

iTrader: (2)

Im unemployed at the moment so I have time to burn. It looks like Ill be working again in a week or two so Id better have it fixed soon or Ill be taking a bus to work.

Grumpy

Too lean also can cause knock.
And you have to add fuel a little bit ahead of where the knock appears, if it's a fuel issue.

Detonation, takes *time* to start, so you have to reduce the timing/add fuel in adjacent blocks.

c4boom

i have been working on geting it so that the blms are about 128 there at 126-130 at the moment but i have yet to do another scan since my last bin change. so it could be a lean in PE issue that i am getting. i think that i am going to have to dyno tune this thing soon so that i can get the PE WOT stuff tuned. thanks guys