I have a Opel Corsa 1999 B type. We had a mechanic redo the engine about 4 months ago, but this week it just does not want to start.
Today had other mechanic look at the engine, and did a quick compression test, cyclinder 1 and 4 where under the normal presure. Those cylinders where running under pressure before the engine was redone.
For a while now the engine has not been running at its best, it idelled under its normal revs and you really had to put your foot down to get some kid of preformance.
Also checked the spark plugs, All are black, and cylinder 4's spark plug has oil on it.
So what could cause the low compression so, soon after the engine has been redone?