Long term fuel trim at -100% both banks
Discussion
I hope someone on here is thinking with more clarity than me. I'm a bit stumped and would appreciate any wise words.
Had a problem where if I stomped on the gas, it lost power, discovered disconnecting the AFM more or less sorted it. Fitted a new AFM today from Racetech, and basically it drives pretty good, a bit of shunting, maybe a little hestiation on acceleration, and maybe not quite the power it was, but those could be imagination.
Hooked up Roverguage, and I see the LTFT is at -100% on both banks. Disconnected ECU and reconnected to reset, and after a few mins, same is true, then took for a drive of about 10mins, no difference. The only other change I have made is to swap the dizzy cap for a new one.
Ideas appreciated. Here are the pictures of Rovergauge with long and short term trims at tickover.
Had a problem where if I stomped on the gas, it lost power, discovered disconnecting the AFM more or less sorted it. Fitted a new AFM today from Racetech, and basically it drives pretty good, a bit of shunting, maybe a little hestiation on acceleration, and maybe not quite the power it was, but those could be imagination.
Hooked up Roverguage, and I see the LTFT is at -100% on both banks. Disconnected ECU and reconnected to reset, and after a few mins, same is true, then took for a drive of about 10mins, no difference. The only other change I have made is to swap the dizzy cap for a new one.
Ideas appreciated. Here are the pictures of Rovergauge with long and short term trims at tickover.
I dont think the long term trim is fully set as well,to start with as it would be at 100% if it had run out of trim. Give it at least 2.5 mins at idle at 90'c - you should see it move slowly before it settles.. Check the AFM is genuine Lucas, not a nasty Chinese replica without any Lucas badges.
Edited by blitzracing on Friday 23 June 20:01
Update with some news, tvrparts said (after I chased them) that the parts Lucas had got in had all failed quality control, so I cancelled my order with them and spent extra money with Racetech to get the one they had in stock, it reads long term fuel trim of -100% on both banks after fully warming up etc.
Had a brainwave and appealed on facebook for a nearby Chim ower who I could do a quick swap with. Steve the star volunteered. So I popped round there Saturday morning, noticed shunting, and not fantastic pickup.
Swapped his AFM onto mine, this was better, with LTFT not quite -100%, he also had another in a box, so we tried that, and all is well, LTFT at -67% and -87%. Almost no shunting and great performance.
So I think I need a return to Racetech. But I may have deeper problems....these LTFT values are not ideal, but at least the engine management is keeping up. STFT is oscillating a few points around zero.
Thoughts anyone?
Had a brainwave and appealed on facebook for a nearby Chim ower who I could do a quick swap with. Steve the star volunteered. So I popped round there Saturday morning, noticed shunting, and not fantastic pickup.
Swapped his AFM onto mine, this was better, with LTFT not quite -100%, he also had another in a box, so we tried that, and all is well, LTFT at -67% and -87%. Almost no shunting and great performance.
So I think I need a return to Racetech. But I may have deeper problems....these LTFT values are not ideal, but at least the engine management is keeping up. STFT is oscillating a few points around zero.
Thoughts anyone?
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