I have an odd and seemingly unresolved problem... no matter what I've tried.
First things first... I have an FSM, I have used all of my Google superpowers, replacement parts are all OEM (even the replacement tubes, lines, sensors, etc) and now I'm asking for help.
The problem:
I have a 96 LX450 (205k) in pretty good nic but it has a nagging problem. After about an hour of drive time the throttle gets what I can only describe as sticky or jerky and does not have a linier or smooth response that it normally does and the idle surges to and stays at about 1500 RPM (while in gear). When it's out of gear and in park the idle will hunt / surge up and down.
What I've done so far:
1.) Removed and throughly cleaned the throttle body and MAF, pulled the negative and let the computer reset (several times)
2.) Recently Replaced - accelerator cable (it was sticking), intake tube, ICV, TPS, all vacuum lines, coolant temperature sensor (not the one for the gauge), new fuel pump and screen.
3.) Within the last 6 - 8 months - full tuneup, fuel filter, EGR (new grommet and tube too), new brake booster and booster check valve. Regular oil changes, etc.
Everything runs and idles normally until the vehicle is sufficiently warm. It never gets hot / overheats. I've tried spraying starter fluid around all of the vac lines and seals and I'm not getting any signs of a vac leak (again almost every hose has been replaced)
The only next steps I can think of is to hook up the old smoke machine and see if there are vac leaks I have not been able to hit with my starter fluid. What am I missing?
Thanks for the help.
First things first... I have an FSM, I have used all of my Google superpowers, replacement parts are all OEM (even the replacement tubes, lines, sensors, etc) and now I'm asking for help.
The problem:
I have a 96 LX450 (205k) in pretty good nic but it has a nagging problem. After about an hour of drive time the throttle gets what I can only describe as sticky or jerky and does not have a linier or smooth response that it normally does and the idle surges to and stays at about 1500 RPM (while in gear). When it's out of gear and in park the idle will hunt / surge up and down.
What I've done so far:
1.) Removed and throughly cleaned the throttle body and MAF, pulled the negative and let the computer reset (several times)
2.) Recently Replaced - accelerator cable (it was sticking), intake tube, ICV, TPS, all vacuum lines, coolant temperature sensor (not the one for the gauge), new fuel pump and screen.
3.) Within the last 6 - 8 months - full tuneup, fuel filter, EGR (new grommet and tube too), new brake booster and booster check valve. Regular oil changes, etc.
Everything runs and idles normally until the vehicle is sufficiently warm. It never gets hot / overheats. I've tried spraying starter fluid around all of the vac lines and seals and I'm not getting any signs of a vac leak (again almost every hose has been replaced)
The only next steps I can think of is to hook up the old smoke machine and see if there are vac leaks I have not been able to hit with my starter fluid. What am I missing?
Thanks for the help.