I have had an intermittent cruise control problem for 6 months or so. After reading every thread i could here, i could not find a close enough match. Luckily, after reading the FSM, and dumb luck, I think I have stumbled across the fix.
Problem - Turn cruise on, green light illuminates (it never goes off through any of this). !/2 the time it would not engage, the other 1/2 it would just fine. THEN, when it WOULD engage, it would auto kick off anywhere from 10sec to 10 min after actuation. The speeds i was trying to engage where always comparable, on a flat highway.
3month ago I took off the speed servo, lines, everything, clean it all, check vacuum(ok) and the brake switch(ok). Put it back together, now it worked about 90 percent of the time....good enough for me. So no more research.
Last weekend while changing the diff fluid, for some reason, i torqued down the two bolts holding the cruise control cable to the servo. That was it!!! nothing else!!! (and no, i dont have a torque wrench, but i know i tightened way past FSM specs).
On my 3 hr drive to work the cruise worked ZERO percent of the time (green light and all).....so, using what little common sense i have i figured it, for some reason, has to do with the two servo / cable retaining bolts. i pulled up torque spec on those two screws. i believe it was about 8.8 ft lbs (About the same as the diff drain plug.)
I pull out my wrench, loosen the bolts to a hair past finger tight, not it has worked 100% for two days (39 mile RT from my hotel to work)
So, don't know why, don't know if it's just my car (i will probably still pick up a servo from a junk yard), or what, but if you have a related problem, check out the two cable / servo bolts. Keep em loose.... I don't know how to post a pic here, but in the fsm ..... page
Servo description - page 8P-4
Servo Torque 8P-3
Servo pic 8E-8
Since i am not a mechanic, and this is just a "theory" to help others out, no harm / no foul if you kill this thread
