We receive reports from time to time from Mercedes diesel owners that all their glow plugs have burned out. We also have received emails from customers who are having problems with one or more glow plugs burning out on a regular basis.
Problem & Solution
Common among these chassis:
We have sold hundreds of sets of glow plugs over the past 15 years and have found premature glow plug burnout can be caused by one or more of the following:1. Glow relay is sticking and staying on too long2. If using manual button it is held on too long each morning3. Carbon in the pre-chambers4. Poor spray pattern of the injectors thus flooding the tips during high heat leading to premature failure5. Injection pump timing set to far in advance6. Failure of alternator voltage regulator creating a charge voltage over 14 volts.7. Continuing to start the car with one or two bad plugs- this puts strain on the other good plugs due to a higher voltageWe have never found a set to just fail under normal operations with all of the above correct.