Brian Smith
Well-known member
93 LT 171,000 miles NO Codes set and I have not connected my computer to see what is happening dynamically -
I replaced original Optispark due to failure last week, plug wires and plugs were replaced as well. I have noticed that the "hesitation" I feel when fully warmed up at part throttle is NOT there at all when cold. I also note that when warmed up at FULL throttle the thing screams as well. If I understand the ECU properly, at closed loop and/or full throttle few sensor inputs are used thus eliminating what I think may be knock retard caused by what the knock sensor interprets as detonation and backing timing out of the ECU.
Added technical data component: I had rocker arms loose and adjusted them, per the FSM, a month or so while back (all required at least 3/4 turn on the locknuts since all had lash). I guess I did a crappy job because one or two still tap when warm (can't hear so good since my time in the military).
Hib are the knock sensors sensitive enough to back timing out when it hears rocker arm noise? Does my assessment of the ECU activity make sense? Is my solution to re-adjust the valves? When I adjusted the valves the engine was cold and hadn't been started that day. Given they are hydraulic elements what are the odds that these lifters are bleeding down or collapsing justifying replacement of the lifter array?
Suggestions?
I replaced original Optispark due to failure last week, plug wires and plugs were replaced as well. I have noticed that the "hesitation" I feel when fully warmed up at part throttle is NOT there at all when cold. I also note that when warmed up at FULL throttle the thing screams as well. If I understand the ECU properly, at closed loop and/or full throttle few sensor inputs are used thus eliminating what I think may be knock retard caused by what the knock sensor interprets as detonation and backing timing out of the ECU.
Added technical data component: I had rocker arms loose and adjusted them, per the FSM, a month or so while back (all required at least 3/4 turn on the locknuts since all had lash). I guess I did a crappy job because one or two still tap when warm (can't hear so good since my time in the military).
Hib are the knock sensors sensitive enough to back timing out when it hears rocker arm noise? Does my assessment of the ECU activity make sense? Is my solution to re-adjust the valves? When I adjusted the valves the engine was cold and hadn't been started that day. Given they are hydraulic elements what are the odds that these lifters are bleeding down or collapsing justifying replacement of the lifter array?
Suggestions?