5KTQ High Idle
Pasqualoni, James E
james.pasqualoni at gs.com
Mon Nov 22 07:30:48 EST 2004
On Sun, 21 Nov 2004j, Mark Woodland wrote:
After being wakened from an early hibernation (June to Novenber) I
('87 5KTQ) back on the road today.
3/4 of the way through the 150 mile shake down cruise, the idle
3000 rpms and stayed there for the duration of the trip. The good
that the rest of the trip was all highway, and we made it home
further drama.. almost like cruise control.
Unplugging the ISV had no effect, and I could find no visible tears
intake leaks. On getting home, I removed the ISV which proved to be
and a manual inspection of all available lines proved fruitless.
I followed this with the WD-40 spray test of all known potential
points, hoses, lines, gaskets, valves, etc..."idling" at 3000 rpm.
I was kinda hoping to take Max to work tomorrow, Any ideas or BTDTs
I also seem to have picked up a prodigious oil leak under the front
engine. The front main seal was replaced at the last timing belt
or so ago, and when the belt was replaced again a few weeks ago, the
mechanic said it did not need to be replaced. I'm kinda vexed that
pulled it apart, replaced the belt, and never mentioned the source
leak, or offered to fix it. Are there any other local points that
to leaking, like the oil pump assembly?
Thanks in advance,
all the best,
Max '87 5KTQ 280K
Check the linkage from the cruise control servo unit that attaches to the
throttle actuator. Sometimes the linkage that keeps the rod from sliding
out of the servo unit breaks and lodges itself into the throttle area,
disallowing the throttle to close to idle position. Second, there is a nut
on the servo linkage who's job in to keep the throttle actuator connector at
the proper length. If this nut backs off the linkage, the throttle actuator
connector has a tendency to tighten (due to engine vibration), thus not
allowing the throttle to close.
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