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[MonzaGSE]

Hi. My 95 omega 3,0v6 started knocking quite heavily today. Noticed it was misfiring a bit about 30 km from home. This went away then a few km later the usual lifter ticking ive had got more noticeable. Then suddenly it felt like something snapped in the engine and there was a distinct drop of power. The power came back so er drove the last km to our destination but with a very loud metallic knocking sound from the engine. The sound follows the revs and seems to come from top of the left bank. Cambelt and rocker gaskets changed about a month ago. Could it be a lifter thats suddenly failed completely? Or any other ideas?

[allen25]

I did have the lifter noise a good while ago. It all happened suddenly and was distinctly noticeable and loud inside the cab, constant too. I didn't suffer any drop in power or any other engine issues you've mentioned. In my case this was related to cylinder 3 only and after replacement of those 4 valves plus engine flush the problem was resolved and fingers crossed has not returned to date.

[MonzaGSE]

Yeah it happened suddenly and its very noticeable inside the car. Must give Opel a call after easter. In the meantime im reduced to my backup Sierra:p

[JayMV6]

Sounds weird but if there's a ticking coming from one bank the first thing I'd check is exhaust manifold. Check where it sits against the head and the down pipe. I thought I had a lifter gone but this was the issue as it makes a similar noise