Cherokee 4WD V6-173 2.8L VIN W 2-bbl (1985)
1.
Start engine and allow to operate at fast idle for atleast 3 minutes.
2.
Bring engine speed to 3000 RPM, then adjust lean mixture screw to an average dwell reading of 35°. Turn adjusting screw in small increments,
allowing dwell to stabilize. The dwell meter may cycle as much as 15 degrees, therefore it is necessary to obtain an average dwell reading. To
increase dwell turn screw back screw out. To decrease dwell, turn screw in. If specified average dwell reading cannot be obtained, check main
metering system for leaks and restrictions.
3.
Return engine top curb idle.
4.
Adjust idle mixture screw using modified tool J-29030-B, until an average dwell reading of 25° is obtained. Turn adjusting screw in small
increments, to allow dwell to stabilize. The dwell meter may cycle as much as 5 degrees, therefore it is necessary to obtain an average dwell
reading. To increase dwell, back screw out. To increase dwell turn screw in. If specified average dwell cannot be obtained, check idle system for
leaks and restrictions.
5.
Remove adjusting tool from idle mixture adjusting screw and recheck dwell reading.
6.
Disconnect MC solenoid electrical connector and check for engine speed change of at least 50 RPM. If RPM does not change sufficiently, check
idle air bleed circuit leaks and restrictions.
7.
Operate engine at 3000 RPM and check for an average dwell reading of 35°. If average dwell reading is 35°, no further adjustment is required. If
average dwell reading is not 35°, repeat steps 2 through 6.
8.
After completing adjustments, seal idle mixture screw openings with RTV sealer and install or connect all components removed.
9.
If necessary, readjust idle speed.
