Chevyman Sheffield England
Newbie
Posts: 2
Reg: 10-05-22
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10-07-22 01:53 PM - Post#2848216
Cant believe I havent joined this forum earlier!
Ive got 2 Lt1s, 2 L03s, a 502 gen 6 bbc and a 433 gen 4 bbc.
Im pretty handy with these things and carb tuning but my L03 TBI is causing me grief. Car is a 93 caprice station wagon.
Engine is stock, timing 8adv, replaced plugs and wires thought maybe leads breaking down.
Issue is at light throttle at about 50mph it starts to miss its quite harsh, but if i step on the gas a bit it pulls itself through. No engine light, starts every time, can drive anywhere in it, engine is strong no smoke, sits just below half on temp gauge when warm. I dont want to just throw money at replacing parts unless I have to.
I do find 99 octane fuel reduces the problem when Im not running 95 but its still there this top gear low throttle missing. My gut tells me its possibly a little too advanced because as soon as I get on the gas a bit it picks up well, but then 8adv is hardly radical? EGR system still in place, everything stock, anyone had this or got any ideas? I dont even want to retard it as everywhere else in the range it drives/runs so well
Alex
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