Why won't my diesel start in extreme cold?
The engine turns over so slowly that the battery drains completely before the cylinders can build enough compression heat to fire. This lack of power, sometimes compounded by constantly corroding cable connectors, makes morning starts almost impossible even with new parts.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Blocking the front grille with cardboard to cut wind chillDid this help you?
- 2Pulling the battery every night to store it indoors at room temperatureDid this help you?
- 3Considering switching to a thinner synthetic oil like 0W-30 or 0W-40Did this help you?
- 4Replacing the battery and starterDid this help you?
- 5Buying new connectors for the battery cablesDid this help you?
- 6Checking the battery and cables for looseness or corrosionDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I actually bought new connectors for the cables when I bought the new battery last year due to the old ones constantly corroding.”source ↗
“Despite all these new parts, starting it in the morning is almost impossible. The engine turns over so slowly that the battery drains completely before the cylinders can build enough compression heat to fire.”source ↗
Where this came up
People with this problem also raised
- 5Why is my car revving so high on a cold start?
- 3Do mini-split heat pumps need a backup heat source in freezing weather?
- 149Vehicle cranks after fuel pump replacement but won't start
- 4What do I need to survive a severe northern winter?
- 3Why is my car hard to start after getting gas?
- 13Why does my car lose power for a second when starting?