454 mAG efi TWINS-ecm OR efi PROBLEM??
06-10-2003, 03:53 PM
#31
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Just to ensure that we are on the same page here;
The scantool based advance values (19-20.1 and 28.5(I think ,very small text ))in your table pertains to 2000 rpm not idle as it shows in the table. Further you have 40+ degrees on the scantool at 3000 rpm. Do you have any scantool values for idle?
Then going to the values measured at the crank, they show 28 for both engines, both at idle and at 2000 rpm. No values at 3000 rpm. do you have any values at 3000 rpm?
The scantool based advance values (19-20.1 and 28.5(I think ,very small text ))in your table pertains to 2000 rpm not idle as it shows in the table. Further you have 40+ degrees on the scantool at 3000 rpm. Do you have any scantool values for idle?
Then going to the values measured at the crank, they show 28 for both engines, both at idle and at 2000 rpm. No values at 3000 rpm. do you have any values at 3000 rpm?
06-10-2003, 06:59 PM
#32
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Ok now....
@ idle the spark advance reading oscillates so rapidly both + & - that you cannot get a value there on the scan tool in normal mode. In service mode @ idle it is 8-10*... this is normal per Az Speed.
The crank timing is 28* @2000 rpm. The crank balancer is not degreed that far. I purchased timing tape to install this week on both engines. I can tell it advance quite alot though. Also, Az Speed sez that is not to much advance in an "unloaded" test. Loaded it will be much lower. I will find out!!
@ idle the spark advance reading oscillates so rapidly both + & - that you cannot get a value there on the scan tool in normal mode. In service mode @ idle it is 8-10*... this is normal per Az Speed.
The crank timing is 28* @2000 rpm. The crank balancer is not degreed that far. I purchased timing tape to install this week on both engines. I can tell it advance quite alot though. Also, Az Speed sez that is not to much advance in an "unloaded" test. Loaded it will be much lower. I will find out!!
