phule
Back in a 400 again
Bear with me I'm frustrated and needs someone else opinion. This is a long story
Vehicle: 1988 c1500 305 Tbi
Mods: open element k&n l, long tubes with h-pipe dual muffed single exit no cats.
Couple months ago I seafoamed my throttle body. When I was done I reved it a couple of times smoke etc. Went to go leave got on the road punched it and it falls on its face sometimes it clears up. Figured a blew out some plugs no big deal. Throw those in no change all plugs looked the same had a light white coating wich i figured as running lean hence the fuel diag. Buy a fuel pressure gauge I have the low side of 10.5 I dead head the pump pressure doesn't change. Ok bad pump replace pump and line retest. 11 psi at idle deadhead pressure rises ok:thumbup:. Take for a drive same problem. Detest fuel pressure fuel pressure drops of at wot. Ok looking at a regulator. Well I replaced that tonight it no longer backfires through the intake and has more pickup but above half throttle there's nothing. Looking for help not sure what direction to go now.
Vehicle: 1988 c1500 305 Tbi
Mods: open element k&n l, long tubes with h-pipe dual muffed single exit no cats.
Couple months ago I seafoamed my throttle body. When I was done I reved it a couple of times smoke etc. Went to go leave got on the road punched it and it falls on its face sometimes it clears up. Figured a blew out some plugs no big deal. Throw those in no change all plugs looked the same had a light white coating wich i figured as running lean hence the fuel diag. Buy a fuel pressure gauge I have the low side of 10.5 I dead head the pump pressure doesn't change. Ok bad pump replace pump and line retest. 11 psi at idle deadhead pressure rises ok:thumbup:. Take for a drive same problem. Detest fuel pressure fuel pressure drops of at wot. Ok looking at a regulator. Well I replaced that tonight it no longer backfires through the intake and has more pickup but above half throttle there's nothing. Looking for help not sure what direction to go now.
Last edited: