Hi everyone. Im looking for a fix on my issue and want to know if anyone experience similar problem

my cyl 1 is leaner than other cylinder. 2-3-4 are exact same color on the plugs bu cyl 1 is significantly lighter.

The car is boosted on a custom turbo setup and pushing 13psi on low boost with a tubular manifold
equal lenght , the turbo is a 63mm billet compressor hx35 with and ar,82 exhaust housing

i run a built motor, sleeves, piston rod, stud etc. compression test is 192-187-187-192

this motor have blown twice cyl 1 for this issue.
just fixed it and trying to figure out my problem.
i can hear all injecteur pulse evenly . I tested and cleaned my id1000, they all flow same and in spec. I even switch inj1 with inj3 and see no changes. I run a walbro 255lph fuel pump, aem fpr and STOCK fuel rail.

im running 45 psi base fuel pressure

could the fuel rail be the issue?! A friend is convince this is the culprit of my problem.

right now I used individual cylinder trim to correct this temperary to five more fuel a bit on cyl 1.

im lost... i never had an issue like that with any of my build in the past. I just reassemble the whole
engine yesterday and i really wish i wont have to
redo it soon.

Any help is appreciated

Hi ap1chief

i redid a compression test and still got pretty good numbers.

i did leak down test in the past and was pretty good except a lil blow by but its normal with the ring gap clearance im running.

Valve job has been done last year, valve clearance has been done last month.

this issue is gonna make me become crazy.

Im not sure the pump is starving because i dont even need to beat the car to see the problem. I mean i drive in vaccum only and feathering the throttle and it will clearly show a lean plug on cyl 1 compare to others


Today I put back the oem fpr and the fuel pump is less noisy than before ???? . Im thinking the regulator may be a factor, will check the plug tomorrow when i get to work