Help with Quadzilla 3 cylinder/6 cylinder box

[Ltk]

On 1/8/2025 at 5:45 PM, Mopar1973Man said:

Keep me posted please... 

Received the PCB board and new rotator switch. Installed it, still acts the same. When truck is running and I switch from off to 3 cyl I got a big idle surge and then nothing. Any thoughts?

Quadzilla has mailed me out a new harness so I'm still waiting for that right now.

[Royal Squire]

@LtkDoes the 6 cyl high idle work?

[Mopar1973Man]

12 hours ago, Royal Squire said:

@LtkDoes the 6 cyl high idle work?

Good question.

[Ltk]

49 minutes ago, Mopar1973Man said:

Good question.

 

13 hours ago, Royal Squire said:

@LtkDoes the 6 cyl high idle work?

Nope, 6 cyl does not work either. 

[Mopar1973Man]

Go back and check. 

 

6 cyl should show 26°F IAT and 123°F ECT

3 cyl should show 13°F IAT and normal coolant display.

 

Operation 

 

Turn switch to setting you wish. Start the engine. Then after high idle starts in 2 to 3 minutes you may turn it off again and high idle will continue till 170°F. 

 

NOTE: To slow of switch change could trigger only 3 cyl mode. If so turn the engine off and wait 10 seconds and restart to clear the previous 3 cylinder mode.

[Ltk]

17 minutes ago, Mopar1973Man said:

Go back and check. 

 

6 cyl should show 26°F IAT and 123°F ECT

3 cyl should show 13°F IAT and normal coolant display.

 

Operation 

 

Turn switch to setting you wish. Start the engine. Then after high idle starts in 2 to 3 minutes you may turn it off again and high idle will continue till 170°F. 

 

NOTE: To slow of switch change could trigger only 3 cyl mode. If so turn the engine off and wait 10 seconds and restart to clear the previous 3 cylinder mode.

 

Followed the exact startup procedure you described with the new PCB board Quadzilla sent me. Here’s the results after 5 minutes of idling; 6 cyl mode engaged on the switch, still at idle RPM. 

 

 

24 minutes ago, Mopar1973Man said:

Go back and check. 

 

6 cyl should show 26°F IAT and 123°F ECT

3 cyl should show 13°F IAT and normal coolant display.

 

Operation 

 

Turn switch to setting you wish. Start the engine. Then after high idle starts in 2 to 3 minutes you may turn it off again and high idle will continue till 170°F. 

 

NOTE: To slow of switch change could trigger only 3 cyl mode. If so turn the engine off and wait 10 seconds and restart to clear the previous 3 cylinder mode.

Here’s the exact same procedure that I described above , except 3 cylinder mode instead of 6 cylinder. 5 minutes of waiting after restart with 3 cyl enabled before start. No idle change, here’s the IAT and ECT temperatures. 

[Mopar1973Man]

Still something wrong. Wrong values for 3 cyl and 6 cyl is half right with 123°F coolant.

 

@Quadzilla Power

 

Edited yesterday at 03:24 PM by Mopar1973Man

[Ltk]

33 minutes ago, Mopar1973Man said:

Still something wrong. Wrong values for 3 cyl and 6 cyl is half right with 123°F coolant.

 

@Quadzilla Power

 

Is it possible that my IAT sensor is bad? Zero codes on the truck with the Quadzilla harness unhooked though.