Engine - CO Checking Procedure/Altitude Correction
88VW02 GROUP24
NUMBER
88-01
JANUARY 29, 1988
MODEL(S):
1988 Golf/Jetta
w/Digifant II
SUBJECT:
CO checking procedure/altitude correction
Prior to performing the basic % CO check of any VW engine, first ensure the following:
^ Engine oil temperature 80~C (176~F) minimum
^ All electrical consumers such as lights, air conditioning and radiator cooling fan are switched OFF
During the pre-delivery inspection, vehicle must be warmed up under load by driving for a short distance on the road.. This will ensure that accumulated carbon deposits on the spark plugs and combustion chambers are cleaned off. Failure to do so will result in an incorrect CO reading.
When checking % CO on Digifant II engines, be sure to follow the published repair manual procedures.
Use chart #1 to find the correct checking values for the altitude that the vehicle is being checked at. If your reading falls within the tolerance band no adjustment is necessary.
If your reading falls outside of the tolerance band, refer to chart #2 for the proper adjustment values.
NOTE
Complying with the altitude corrected CO values will assure that the input signals to the ECU (computer) are correct.
IDLE CO FOR 1.8L DIGIFANT II