Fuel cut RPM
 

Hi, my car is an 88 NA and in the haynes manual, it says the fuel cut rpm should be 1800 for cut off and 1200 for the return. On my car, I'm getting a 1950 cut and a 1450 return. What the heck does this mean? Neither the haynes nor the TSRM really explain anything about it other than how to check it.

If you're going by the stock tach then definitely don't worry about the variation. Honestly, that deviation isn't so bad and may be due to aging electrolytic caps in the ECU.