bluehawk2

iTrader: (74)

I am having problems with my car retarding the timing about 3-4 degrees only under full throttle. I am running the diablo tune. Called diablo and they told me that .5- 1 was the max acceptable limits for retard with their tune. What is wrong with my car. I think i am running good 93 gas. Is my prob the gas the knock sensors, the plugs or some other prob? I am running the ngk tr65 plugs. I think it is the 65's. either way they are not the nitrous plugs. Please give me some help. Thanks everyone.

jimmyblue

iTrader: (11)

Watch the KR more closely and see if it's there as
soon as you mash the throttle, or if it shows up
during a WOT pull. If it hits & slowly bleeds down
from the time you open the throttle that's probably
just tuning, unfortunately things you can't see or
touch with the Predator. If it pops up always about
a particular RPM, that's a characteristic of false
knock. Could be engine mechanical noise, over-
sensitive knock sensors, exhaust buzzing or could
be some over-advanced / under-fueled condition.

Dial your spark advance all the way negative and
try it again, if it still gives you the same KR then
it's probably false.

bluehawk2

iTrader: (74)

Thank you, I have a friend that has hp tuners. We saw this prob last night on HP tuners. I will have to get the computer back on the car to see when it is retarding the timing. I know that it will not retard timing if I rev the car to wot in park, however when we go down the road and hit wot it will retard timing usually 3 or 4 degrees.