|
Ok I think i got this thing licked finally. After a ton of diagnostic work. I took the dinan intake out and went back to the drop in filter and and intake tube it was the only part I could convert back to stock. I put the original MAS back in and reset adaptations. After multiple drives. I was still getting LTFT of anywhere from 20 to 25%. Took out the old MAS and installed the new one reset adaptations again and bam LTFT went to -.88 at idle to 0.00.under any load/rpm.once warmed up however LTFT returned to 10 to 12% but only at idle as soon as any throttle is applied LTFT goes right to 0 00 no lag or bouncing around. Engine runs smooth an pulls strong throughout all of this. I have monitored this now for several days. It's remained 100% the same when engine is in open loop and cold and not running on MSA ltft - .88 to 0.01 at idle and 0.00 under load. Once warm and car enters closed loop and runs off the MAS ltft increase to 10 to 12% only at idle. Point to a small vaccum leak somewhere. I couldnt pin point it until yesterday morning whent out to start the car. Put my foot on the brake pedal and it was rock hard zero give. As soon as the car started brake pedal returned to normal. The leak is somewhere in th vacuum lines to the brake booster. This morning brake pedal was normal. Popped the brake booster check valve out of the booster and placed finger tightly over the end of the check valve ltft dropped to under 2% so either the check valve or rubber grommet are leaking slightly most likely and cheapest fix under $60 or the booster diaphram has a small leak least likely since the vacuum leaks down intermittently over night.since I fixed all the other vacuum leaks bad valve cover gasket for god knows how long and the broken intake pipe. My guess is it finally is building more vacuum at idle and the check valve has startdd to fail. Parts are on order should hve them by end of week and see if i am correct. Once I have all this sorted I'll put the dinan back on and see if the computer can handle the larger volume of air.
|