Rich Neutral, Dead Lean in Gear Question
Thread Starter
Teching In
Joined: Apr 2015
Posts: 23
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Rich Neutral, Dead Lean in Gear Question Good evening everyone! I'm new to HpTuners so bear with me. I've used several standalone systems on motorcycles but first time diving into this stuff. To start the motor is a stock 4.8 with valve springs and SD80s, 70mm turbo, auto car, a1000 pump, billet efi aeromotive regulator at 58psi base. 3 bar SD tune
The car starts right up with no problem and idles pretty rich, ~12.0 Afr, but as soon as I put it in gear and it gets a load it goes dead lean, off the scale of the gauge. At this point it's obviously struggling to stay running but if I feather or and get it back to neutral or park it'll slowly work it's way back to the rich side.
The best I can figure is that something in the tune is making it pull fuel based on the map reading but I have no clue beyond that. I tried moving the fueling to extremely rich and nothing. Fuel pressure is rock solid, vacuum holds steady, cleaned the fuel filters to make sure they weren't clogged somehow, etc. I ran the scanner and timing is steady, no knock, I'll try to post the tune from my laptop tomorrow.
I humbly request the expertise of the group because I'm sure it's just something in the tune I'm ignorant to.
Thanks in advance
The car starts right up with no problem and idles pretty rich, ~12.0 Afr, but as soon as I put it in gear and it gets a load it goes dead lean, off the scale of the gauge. At this point it's obviously struggling to stay running but if I feather or and get it back to neutral or park it'll slowly work it's way back to the rich side.
The best I can figure is that something in the tune is making it pull fuel based on the map reading but I have no clue beyond that. I tried moving the fueling to extremely rich and nothing. Fuel pressure is rock solid, vacuum holds steady, cleaned the fuel filters to make sure they weren't clogged somehow, etc. I ran the scanner and timing is steady, no knock, I'll try to post the tune from my laptop tomorrow.
I humbly request the expertise of the group because I'm sure it's just something in the tune I'm ignorant to.
Thanks in advance
Might start with checking misfire counts, try to rule out
wideband spoofing before you start chasing its readings.
Nothing crazy going on like trying to run a turbo motor
with a 1-bar MAP sensor, right?
wideband spoofing before you start chasing its readings.
Nothing crazy going on like trying to run a turbo motor
with a 1-bar MAP sensor, right?
Thread Starter
Teching In
Joined: Apr 2015
Posts: 23
Likes: 0
I meant to update this. I actually found the problem. There was a pinhole in the line going from the TB to valve cover that was causing all of the havoc. Replaced that and everything was right as rain.
