The importance of checking cars before tuning….

This VXR we went out to tune had some instantly noticeable symptoms. Whether related or not, it caused us to start investigating further.

Smoking from the exhaust and the engine felt lazy when revving. We started digging. On this VXR we found low compression on cylinders 3 and 4. Cylinders 1 and 2 were very close to our limit too. The engine was breathing heavy on idle too from the crank vent on the front of the rocker cover. There is something wrong with this engine and it’s not fit to be tuned.

On this VXR our list of things found wrong was:

– Low compression on cylinders 3 and 4 (Pic is cylinder 3).
– Heavy breathing from crank case vent.
– Faulty one way valve on rocker cover.
– Front tyres close to the limit.
– Rear tyres close to the limit and minor cracking around the edges.

Mileage doesn’t play into this either, this VXR only had around 65K miles on it with full service history.

If you have any symptoms of your vehicle that you think something might not be right, get it checked. Regular routine checks are good to make sure everything is running well and doing as it should do. If you do then have any faults, they can be caught and fixed early (and before tuning is attempted).

SM Tuning – www.smtuning.co.uk


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