Technical Sporadic lorry-like noise

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Technical Sporadic lorry-like noise

Nickmey

New member
Joined
Feb 17, 2014
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15
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Location
Vienna
Hi,
My '98 TD 100HP (75kW) Marea runs well but I have been noticing a sporadic lorry-like noise when driving it in 3rd gear at about 40 kph, just accelerating slightly.
While the noise is on, a slight loss of power is noticeable on uphill streets.
When accelerating to join a motorway or running at 120 - 130 kph it never appears.
Also, when coasting at about 10 kph in second gear it sporadically decelerates and immediately picks up again to the previous speed.
No problems on starting or idling noticeable. what could this be? A valve:confused:?
I need the two pieces of tubing joining the oil cooler to the motor - they get oily a day or two after being cleaned with brake cleaner :(. My usual sources of Italian car parts seem to be out of then - as are also all scrapyards around me.

Nick
 
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