I know that the computer controls the timing on this engine and i haveheard before that turning the distributor will not have any effect on thetiming.I have installed the dist at tdc all plugs are correct and thejeep runs very well just curious as to why when I turn the dist. Theengine will die or bog out. I thought that the comp controlled this.Does the position of the dist matter?
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Your timing is locked. (distributor is installed with no adjustment feature... on 02's you may not even have a distributor as it's replaced by the cam sensor) All timing and fuel mixture is controlled by the engine computer. Main inputs to the computer that influence changes are the throttle position sensor and MAP sensor but all sensor inputs are evaluated.
1. Set parking brake. Shift automatic transmission to Park or manual transmission to Neutral. With A/C off, start engine and attain normal operating temperature.
2. With ignition OFF, connect an ignition timing light and a calibrated, expanded-scale tachometer.
3. Disconnect 4 " and 10 " Hg (CEC System) vacuum switch assembly wire connector (located at top of valve cover). Disconnect and plug distributor vacuum advance hose.
4. Start engine, increase engine speed to 1600 RPM and check ignition timing. Adjust timing to specification listed on Emission Control Information label (if necessary). Tighten distributor hold-down clamp and recheck ignition timing.
5. Turn engine off and remove timing light and tachometer. Connect No. 1 spark plug lead, if disconnected. Unplug and connect distributor vacuum advance hose. Connect vacuum switch assembly wire connector.
NOTE: If timing light has an adjustable advance control feature, turn control to OFF position.
straight six engine ,153624 firing order i know no2 and no4 leads have a sort of loop on the jeep engine and i should imagine this is the same on this model ,if you dont know where no one is then remove the rocker cover and turn engine over till the valves on no1 are closed and remove the plug to make sure piston is at top ,then you have the position on the distributor cap where no1 is ,lift cap and see where the rotor arm points too ,then this is no1 .then clockwise rotation the next hole is no5 and so on
To avoid confusion, tag and remove the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one
orientation, it could have been removed previously and rewired. The
resultant wiring would hold the correct firing order, but could change
the relative placement of the plug towers in relation to the engine.
For this reason it is imperative that you label all wires before
disconnecting any of them. Also, before removal, compare the current
wiring with the accompanying illustrations. If the current wiring does
not match, make notes to reflect how your engine is wired.
Fig. 1: The firing order can usually be found cast onto the intake manifold
Replace each wire individually from plug to distributor one at a time and they will be in the right order. Or make yourself a diagram before you start, very carefully marking the first one you take off the distributor and where it came from and where it goes. Hope this helps..
if you overhauled the engine and replaced the timing chain & gears, as long as you installed them properly and have installed the ign wires in the right places, the distributor is "locked in place" and is non adjustable (unless you are me, but that's another story) Computer makes all timing changes.