Hello all,
Breaking in my rebuilt engine, glad I did a stock rebuild because I'm sure the problems would be amplified if I made a lot of changes. I have some bolt ons that are likely contributing to the ping, I'm afraid I know what the answer is but just wanted everyone's input. Ecm is still on the stock tune. She won't ping in first or second, but the engine is under substantially less load due to tire spin.
In 3rd and od it will ping at any rpm above 10 psi. Seems odd, 10 psi is 10 psi right? Wouldn't think the late model blower and od would contribute here. An interesting note, my narrow band o2's indicate rich while pinging. As soon as I can hear the ping I back off. Haven't made a run at full throttle yet.
List of particulars:
90 aod, .030 bored.
Mls head gaskets, arp head studs
Late model blower, 10% od, raised top
Late model injectors
75mm bbk tb
Ken Wagner DIC
Stock exhaust manifolds, deleted cats, big exhaust from cat delete on back
Stock fuel pump, fresh filter
Mac intake tube, deleted 90 degree tube
Stock new ignition system
4.11 gears
I think the final clue is part of the problem, the original maf sensor electronics are not installed. Long story short, I had to give up my original to fix another car (before I knew better). I have 2 Mafs and have tried running both in the original housing with the same results:
F1SF-12B579-AA- I believe this was from an old cobra motor
F1ZF-12B579-AA- pretty sure this was a 3.8l n/a Taurus.
Since I'm seeing rich on my narrow bands, is it possible the computer is advancing timing too far due to poor calibration?
I've been researching, looks like the best starting point is to get the correct maf first.
Appreciate everyone's help,
JJ
Breaking in my rebuilt engine, glad I did a stock rebuild because I'm sure the problems would be amplified if I made a lot of changes. I have some bolt ons that are likely contributing to the ping, I'm afraid I know what the answer is but just wanted everyone's input. Ecm is still on the stock tune. She won't ping in first or second, but the engine is under substantially less load due to tire spin.
In 3rd and od it will ping at any rpm above 10 psi. Seems odd, 10 psi is 10 psi right? Wouldn't think the late model blower and od would contribute here. An interesting note, my narrow band o2's indicate rich while pinging. As soon as I can hear the ping I back off. Haven't made a run at full throttle yet.
List of particulars:
90 aod, .030 bored.
Mls head gaskets, arp head studs
Late model blower, 10% od, raised top
Late model injectors
75mm bbk tb
Ken Wagner DIC
Stock exhaust manifolds, deleted cats, big exhaust from cat delete on back
Stock fuel pump, fresh filter
Mac intake tube, deleted 90 degree tube
Stock new ignition system
4.11 gears
I think the final clue is part of the problem, the original maf sensor electronics are not installed. Long story short, I had to give up my original to fix another car (before I knew better). I have 2 Mafs and have tried running both in the original housing with the same results:
F1SF-12B579-AA- I believe this was from an old cobra motor
F1ZF-12B579-AA- pretty sure this was a 3.8l n/a Taurus.
Since I'm seeing rich on my narrow bands, is it possible the computer is advancing timing too far due to poor calibration?
I've been researching, looks like the best starting point is to get the correct maf first.
Appreciate everyone's help,
JJ