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I recently installed term x max on Gen 5.3
lm7
243
Tbss
92mm dbc tb
btr stage 1 turbo truck cam
Truck was running good on stock ecu for ~5k miles. Engine was a 100% rebuild. All machine work on block heads all internals from crank to untake new. Only stock parts are block and heads
Running fine, installed term x and hasn't ran since.
I had a remote tuner log on and his only suggestion is a leakdown test. Im pretty sure i didnt lose compression sitting in driveway installing this ecu over course of 12 hrs so i dont think thats it
Im attaching an image of what the base fuel table looks like when i leave merge learn table the truck is idling very rough right around the sketch box in image.
Very standard na ls 5.3 settings
14.7 afr
20-36 timing from idle to wot with cruise being the highest . Ive been all over at idle with adjusting but that weird area remains where its pulling all the fuel
My question is, does this pattern/image on fuel table give anyone any ideas as to what i should be looking at? Ive been focused on vac leaks, timing, afr but not getting anywhere. Cant reinstall old harness, its cut
New plugs, wires, 1 bar map, cam sensor. No change
Normally when they fail, they show lean, the ECU tries to add fuel out to compensate. It will add fuel till it hits whatever the limits are in the tune.
Without seeing a log, that's just a guess though.
Is this a new problem or has been like this since it was put together.
Last edited by LilJayV10; Sep 15, 2024 at 01:16 PM.
The problem came with the termator x installation. Ran fine stock with stock ecm that had been tuned. I installed the terminator and 12 hours later its like this.
the wide band ensor that is installed is the one that came with the Terminator X. I have it in about 6 in behind the collector.
I do notice that when I'm looking at the output on my PC the AFR is set to 14.7 but it never really gets above 12 and when I raise the RPMs it goes down to around 9:00. It sounds a little better at higher RPMs but it's still not right when it tries to idle it feels like the motor is going to shake out of the truck
The problem came with the termator x installation. Ran fine stock with stock ecm that had been tuned. I installed the terminator and 12 hours later its like this.
the wide band ensor that is installed is the one that came with the Terminator X. I have it in about 6 in behind the collector.
I do notice that when I'm looking at the output on my PC the AFR is set to 14.7 but it never really gets above 12 and when I raise the RPMs it goes down to around 9:00. It sounds a little better at higher RPMs but it's still not right when it tries to idle it feels like the motor is going to shake out of the truck
2 things:
are you sure it’s in closed loop? That’s the only way it’ll self adjust
did you input the correct injector data? “Close enough” is not close enough with the self learning. It needs to have the correct injector data
Everything else has to be setup correctly. A picture of your fuel table doesnt help. If your cubic inches are off, fuel psi is off, timing, off, map sensor incorrect, etc.....it could be a whole list of things. Your going to have post your tune and a data log.
"I have it in about 6 in behind the collector".
"I do notice that when I'm looking at the output on my PC the AFR is set to 14.7 but it never really gets above 12 and when I raise the RPMs it goes down to around 9:00".
Check for leaks at the collector joint.
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Terminator x max pulling fuel 
