16/10/2026
🔧 Vauxhall Grandland – Engine Diagnosis & Repair
This Vauxhall Grandland arrived with a flashing engine management light (EML) and a rough-running engine. It was immediately obvious that the engine was misfiring, and even during starting, there were clear signs that one cylinder was down on compression.
🔍 Diagnosis
We carried out a full diagnostic check, which identified a misfire on cylinder 1. After removing and inspecting the spark plugs and carrying out a compression test across all three cylinders, we confirmed that cylinder 1 had a compression issue.
At this stage, we spoke with the customer and explained the options:
🔹 Strip the engine down to investigate the fault and price the necessary repairs once we knew the full extent of the damage.
🔹 Source and fit a second-hand replacement engine.
The customer opted for the first option, allowing us to investigate the problem properly before deciding on the best course of action.
🔧 Finding the Fault
With the cylinder head removed, we found the culprit: a burned exhaust valve on cylinder 1, which was allowing compression to escape and causing the misfire.
The cylinder head was sent to a specialist machine shop for repair. During their inspection, they also identified slight damage to one of the camshaft lobes. Rather than refit a damaged component, the decision was made to replace the camshaft while everything was apart.
✅ Putting It Back Together
Once the cylinder head repairs were complete, we reassembled the engine using:
✔️ Repaired cylinder head
✔️ Replacement camshaft
✔️ New gaskets and bolts
✔️ New timing belt kit
✔️ New auxiliary belt
✔️ New water pump belt
✔️ Fresh engine oil and oil filter
✔️ Fresh antifreeze
With the engine apart, it made sense to renew the associated service items and belts rather than refit old components and risk having to revisit the job later.
Another example of why proper diagnosis is important before jumping straight to replacing parts. By investigating the original engine, we were able to identify the actual cause of the fault and carry out the necessary repairs.
And the only thing missing? A nice completed picture of the engine bay! 😂
Unfortunately, it was Friday, and getting the job finished took priority over remembering to take photos!
📍 RJG Automotive – Moorfield Garage, Gatehead Road, Kilmarnock, KA2 0AH
📞 01563 621981
For diagnostics, servicing and repairs, get in touch with the team at RJG Automotive.