RPM surge
06-11-2017, 12:43 PM
#1
RPM surge
The RPM on my 1979 L48 started to surge from 1100 to 1500. It's nothing serious but annoying when driving in traffic. I thought it might be a fuel issue so I cleaned the carb and changed the fuel filter but no change. I remember years ago there used to be a filter stone at the carb so I checked that and there is nothing. Any hints would be appreciated.
06-11-2017, 10:30 PM
#2
The RPM on my 1979 L48 started to surge from 1100 to 1500. It's nothing serious but annoying when driving in traffic. I thought it might be a fuel issue so I cleaned the carb and changed the fuel filter but no change. I remember years ago there used to be a filter stone at the carb so I checked that and there is nothing. Any hints would be appreciated.
Put the car in park with the engine running. Then disconnect the vacuum line to the power brake booster. If you get a similar surge you may have a cracked vacuum hose somewhere. Then start to move / wiggle some of the vacuum lines to see if you can reproduce the surge.
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FredFitz (06-12-2017)
06-12-2017, 11:37 AM
#3
As a test try this.
Put the car in park with the engine running. Then disconnect the vacuum line to the power brake booster. If you get a similar surge you may have a cracked vacuum hose somewhere. Then start to move / wiggle some of the vacuum lines to see if you can reproduce the surge.
Put the car in park with the engine running. Then disconnect the vacuum line to the power brake booster. If you get a similar surge you may have a cracked vacuum hose somewhere. Then start to move / wiggle some of the vacuum lines to see if you can reproduce the surge.