Cec.
timing of what, cam or spark.
what engine, is there.
Computerized Engine Control or Computerized Emission Control (CEC)
the 4.0L and 2.5 liter , uses the RENIX ecu. and not the CEC. tje REnix has fixed, CKP sensor timing.
the 4.2liter has distrib timing.
see below.
my guess is you have the instructions and
get lost at the find VACUUM switch on top of valve cover words?
yes?
i this 1988 a carb fueled engine
some were, and guess what; that matters too..
that link above is all 100% pro answers, i read it and every word true.
2.5Liter? 4 cylinder? nah its TBI fueled.
4.2L verbatum. fsm
The ignition timing instructions on the Vehicle Emission Control Information (VECI) label should always be followed, especially if they differ this procedure. The instructions and specifications on the label may reflect changes which occurred part way through a production run. If the label is missing, a replacement can often be ordered from a local dealer.
Warm up the engine to normal operating temperature.
Set the parking brake, shift the automatic transmission to PARK and the manual transmission to the NEUTRAL position.
Clean off the timing marks, then use some white chalk to highlight the pulley notch and timing scale.
Stop the engine and connect the timing light to the No. 1 (front cylinder) spark plug wire.
USA modern inductive timing light to #1 spark wire.
Disconnect the Computerized Emission Control (CEC) system vacuum switch wire, located at the top of the cylinder head cover. (my guess you cant find this?)
Disconnect and plug the vacuum line at the distributor. This is done to prevent any distributor vacuum advance.
Start the engine, increase the idle speed to 1600 rpm, and adjust the idle to the figure shown on the underhood sticker. This is done to prevent any distributor centrifugal advance. If there is a throttle stop solenoid, disconnect it electrically.
Aim the timing light at the pointer marks. Be careful not to touch the fan, as it may appear to be standing still (an illusion caused by the strobe effect of the timing light). If the pulley notch isn't aligned with the proper timing mark (refer to the Tune-Up Specifications chart), the timing will have to be adjusted.
Loosen the distributor clamp locknut. You can buy trick wrenches that will often make this task a lot easier. Turn the distributor slowly to adjust the timing, holding it by the base and not the cap. Turn counterclockwise to advance timing (toward BTDC), and clockwise to retard (toward TDC or ATDC).
Tighten the locknut, then check the timing again in case the distributor moved slightly as you tightened it.
Connect the distributor vacuum line, the vacuum switch wire and correct the idle speed to that specified in the Tune-Up Specifications chart.
Stop the engine and disconnect the timing light.
the renix was use on other jeeps. XJ etc.
i think this puts the ECU in the correct mode. pulling this plug wire "X". top left in drawing 2. for setting spark. i posted all steps so you can say where you get lost.
BBD carter 2 barrel carb engine, right?
and is a computer controlled carb. i have the schematic of it.
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