Hicking Renault 1.2 TCe motor (2012) - 2 potential causes (spark plug/vacuum pipe)

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MegBos
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Lid geworden op: 10 nov 2018
Laatste bezoek: 17 jan 2025 17:04
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Hicking Renault 1.2 TCe motor (2012) - 2 potential causes (spark plug/vacuum pipe)

Bericht door MegBos »

I am owner of a Renault Megane Grandtour 1.2 Tce for more than 12 years. The car serves me well and I never had any major issues. The engine runs extremely smooth and silent. From that perspective I think it is the best engine in its class. Still since early days the engine sometimes hicks when accelerating from standing still at low revolutions (1000 to 1500 rpm), occasionally also seems to pre-ignite at more throttle (1500 to 2500 rpm) and can run more irregular at higher throttle and revs (2000 to 3000 rpm). The latter 2 issues I only have if the engine has been run a low revs and low loads for extended time. Riding slightly sportier or after medium duty cycles this normally does not happen.
I tried to capture these phenomena and rough engine revolution, and throttle stands, but these are not exact measurements (rather indications). I noticed that whenever I changed the spark plugs these symptoms were (much) less or even disappeared. Spark plug electrode distance increases with time and distance, so I think electrode distance is very important. I never tried to reduce the distance of used spark plugs to factory settings (0.7 mm), but I think it is worth a try, especially if the remaining lifetime is still interesting enough to do it.
Another potential issue that could cause much of these problems might be the valve cover evacuation connection! There is a small pipe on top of the valve cover, which in my case always was surrounded with some oil, so clearly not liquid (air) tight. Not too long ago after a long ride I checked the engine and pushed on the plastic socket that attaches to the pipe. It moved down a tiny bit, so I wondered if I could pull it up…., I could. The pipe was completely out of the valve cover! As the vacuum system also actuates sensors for the motor management, I thought this isn't good. I decided to clean the pipe, and the inner part of the valve cover the pipe is fitted into and somehow seal it. I turned to Teflon tape. 2 or 3 turns of tape around the pipe and putting it back. Make sure no tape can enter the inner pipe or valve cover, be secure with only taping the outer pipe. I pushed back the pipe, now needing some force. With a rubber hammer I gently pushed it in place, and it seems to sit there with no leakage ever since. As I cleaned the whole area properly, I can see if any oil accumulates. For about 3 months now all is clean and dry. Moreover, I had no issues with the engine at all since!
It is too early to say that the problems were at least partly related to the vacuum system pulling wrong air due to the leaking pipe, but it possibly helps as a cure.

My advice is to:
Keep the spark plug electrode distance to no more than 0.7 mm
Seal off the pipe of the valve cover if yours show signs of oil around it

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