ignition spark knock under heavy accell

[BAILEY1575]

So heres the issue we have an 05 srt 10 in our shop with cold air intake and headers other than that rest appears stock they dealer traded truck when it got here it would barely run found that left 02 was bad and cat was restricted we replaced those and truck would finally run but poorly performed compression test and found left bank all under compression removed motor and found all cylinders on left bank had been fuel washed. sent motor out to local performance shop and had rebuilt and injectors flow tested ect. installed motor and replaced cam sensor due to (the fact it was installed incorrectly the first time and was broken also had ecm replaced as were not sure if had
aftermarket programing in it. HERES the issue truck runs great now but under heavy accel or pulling hill it has extream spark nock almost like its way to lean
does anyone out there have any ideas thanks kinda stuck?????? we have been running premium and engine now has 500 miles on it total vehicle milage
is 6500 miles :dontknow:

 

[BAILEY1575]

spak nock?

just ahd engine rebuilt and unde haevy accell sever spark nock had ecm replaced injectors flow tested and cam sensor replaced. does have cold air intake and headers reason for rebuild was left bank washed cylinders and had low compression replaced pre cat o2 and cat left bank truclk runs fine until it is under haevy accell any ideas

 

[viperhauler]

thread merged...

 

[VENOMOUS1 RACING]

The bad O2 could have been responsible for washing that bank out for sure. Sure yall did, but check the fuel pressure while it's detonating. Also surely yall did as well, but replace plugs that were carbon fouled. Really all I can think of except a sensor being outta whack. Map sensor, coolant temp, ambient air temp. Use a DRB3 or data logger to see what happens when it goes lean/ advances timing.

 

[Slitherbeast]

Knock sensor faulty? Or maybe to much compression ratio from the rebuild . Do you have details of the build?

 

[BAILEY1575]

they went 20 over but said used chrysler pistons with crown to off set
oversizing ? no codes setting