A while back, my car (Nissan Primera SVE) started to rev up and down for a few moments after I had started the engine. I would get in, turn the key and then wait for the tachometer needle to stop moving by itself.
As time went on, the issue became noticeably worse. The revs became faster and and it made me look like a boy racer that was revving his car for the sake of it.
Stupidly, I decided to ignore it in the hope that the problem would eventually go away (in fairness, this has happened a lot in the past). The breaking point came when I was parked at a traffic light and an engine warning message appeared on the dashboard computer:
ENGINE: A malfunction may have occurred in the engine control system. Although there is a remote chance of an immediate breakdown, avoid driving at a high speed.
This forced me to visit the Nissan dealership, which charged me €80 for a diagnostic test. When the results came back, I was told that the timing chain (NOT the timing belt) in my engine had been “stretched” (The term “stretched” basically means that the links on the chain have moved further apart due to wear and tear). To fix the issue, the dealership quoted me close to €800! Luckily enough, I was able to get a quote of about €390 from another mechanic!
Anyway; I figured I’d write about this, simply because it could help one or two people in the future.