- Joined
- Nov 20, 2018
- Messages
- 993
Back in the old VW diesel days, they had different injectors different years. 110,120 and 130 bar models. They had different pump timing specs for the different ones, till eventually they went with spec for the 120s for all.
Hard starting cold was either glow plug failure, leaky return lines letting air in to lose the prime, or leaky lines anywhere actually. Sometimes the pump seal would wear out and allow air in there while sitting overnight. The test was to park the car nose downhill to get the fuel tank level above the pump level and if it started fine, you were sucking air somewhere.
The pump seal cheap fix was to install an electric feed pump to deliver fuel to the pump for starting. Once running internal pressures would force the seal to seal on the shaft.
Engine compression is also a good test to do. Below minimum spec makes them hard starting cold.
Hard starting cold was either glow plug failure, leaky return lines letting air in to lose the prime, or leaky lines anywhere actually. Sometimes the pump seal would wear out and allow air in there while sitting overnight. The test was to park the car nose downhill to get the fuel tank level above the pump level and if it started fine, you were sucking air somewhere.
The pump seal cheap fix was to install an electric feed pump to deliver fuel to the pump for starting. Once running internal pressures would force the seal to seal on the shaft.
Engine compression is also a good test to do. Below minimum spec makes them hard starting cold.