As the title says I am suddenly very lean. Here's a little background; just installed new deats 1300, walboro 255 and a red. I was just starting to get things figured out ltfts within 3% I was pig rich at 10.5. Did a little maf scaling to try to make things a little better and suddenly I can't get the afr below 13. Swapped the fuel and high bram relay no change. Check the boost source to the fpr it was attached. Went back to my map that last ran rich it's lean now too. I'm gonna try cleaning my new inline fuel filter in case I got some junk in the fuel. Anyone have any other suggestions to look for?

 

the the FPR vacum hose nexct to the dipstick on the engine. there is a thread on here with pictures if you need it.

 

That was one of the first things I checked. It was attached I and throw a zip tie on it for good measure. I may pull the line and hook it to my brake bleeder to ensure there isn't a hole in it.

 

busted hfc if you have one or exhaust leak near the wideband sensor.

 

Put the MAF Scalings back and see what happens. If you are still lean, then there is a mechanical problem.

 

No cat but I'll check for exhuast leaks

 

Went back to the last map that ran good and was still lean so pretty sure your correct is a mechanical issue.

 

so check for exhaust leak, any code? im no expert but who knows.

 

Can't find any exhaust leaks. Tried altering the Naomi change. Leads me to believe it hast to be one of three things. Fuel pump, injectors or maf went bad. I can hear the pump when I turn the key to start and not press the clutch pedal and it sounds normal. Does anyone have or no of a way to test a maf?

 

You will throw codes if the MAF is bad.

Did you check the Vacuum hose that connects to the FPR under the valve cover cover?

 

what wideband?

 

check your wideband sensor, there is a vidz in aem site...

 

It's an aem, I'm leaning toward it being correct because the car will not run wot, it pops sputters knocks it's just awful up top. If it was pulling hard still but aem was reading lean I would consider the wideband being off.

I have no codes so maf must be functioning. That leaves fuel delivery I'm gonna fuel pressure Gauge and check for a possible air leak post maf pre turbo.

At least I thought I was having trouble with the injectors at closed loop. Begining to think whatever this is might be the culprit of that problem too. The car seems to struggle maintaing 14.7 it oscillates around a lot. What about the front o2 sensor going bad? If it's not reading correct this might be the cause of everything no?

 

There is only one vac line to the fpr correct? If so it's been zip tied and had no affect on the problem. I did clean my inline fuel filter it didnt have anything in it.

 

Pull the injectors and make sure the o-rings are still good. Try a boost leak test to see if you are leaking air somewhere.