by jer1 » Wed Mar 14, 2007 10:16 pm
A little while after I bought my truck, I picked up a 366 spring because I'd heard they were a good upgrade. Before installing it I was talking to the po and he told me it already had one. After installing gauges, I cranked the pump up. I was able to max the fuel screw with no sign of runaway. With the screw in all of the way, it was a little slower returning to idle(would start decelerating as soon as I let off the pedal, but tach didn't move down as quick as it did a turn out) It would start to de-fuel at about 2900, which I had read was fairly common. Fast forward.....Two days ago I had to pull the pump apart to replace a weeping throttle shaft o-ring and bushing. I figured as long as I was in there, might as well throw in the new spring. The old one looked the same as the new one, but didn't have any number on it that I could see. Got it back together and went for a test run. Let off the throttle and the r's would hang for 4-5 sec. before dropping. Close to runaway, which I'd never experienced before. Had to back out the fuel screw 3/4 turn or so to fix this. Now it doesn't de-fuel till 3400, but seems to be lacking a bit of power. Also, if I gradually increase the throttle, it's good till 1600 rpm. Just a little more, and it climbs to 3200(maybe more, that's where I let off) Tried turning the fuel screw down more with same result. What's going on? Input appreciated, Jer
91 W250, 6" susp. lift, 2" body lift, 36" Buckshots, Powersmoke IC, Haisleys studs and fire rings, PDR valve springs, Banks high ram, HTB2 62/14, 4"DP, Dual 5" exhaust, Bullydog boost and pyro (pre-turbo), POD's, tweaked pump, timing bump, 3200 gs