10-04-2015, 08:28 PM | #1 |
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Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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5.3 woes
Hi. I'm having some issues with the 5.3 in my '63 gmc. It runs fine in the garage or parked, but under load it seems like it's not getting enough fuel. doesn't throw any codes...it chugs and bucks, struggling to get up to highway speed....forget about passing! Im running a walbro 392 in-line pump, wix vette filter/reg, -6 fuel line from tank to fuel rails. the same setup as my 6.0, I even swapped pumps out of my 6.0l to make sure.. it also has longtube headers, a cold air intake, and an edelbrock pro flo intake, now I did use the stock 5.3 injectors and got them to fit the pro flo intake and billet rails. is it possible that I need bigger injectors? I don't know what else to check. thanks.
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my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682 |
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