manfredschulze1
Avantime Engine Knocking
Summary of the thread
A 2003 Renault Avantime with a gasoline engine is experiencing a knocking sound, reduced power, jerking during acceleration, and smoke emissions. The suspected cause is deposits in the combustion chamber. Suggestions include checking cylinder heads and ignition timing. Ultimately, a professional cleaning of the combustion chamber resolved the issue, restoring smooth engine performance.
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4 comment(s)
manfredschulze1 (community.author)
Cylinder heads and ignition timing, huh? I hadn't considered those. When you had the issue, was the knocking constant, or only under load? And did you manage to fix it yourself, or did you end up taking it to a shop?
georgschulze8
The knocking was mostly noticeable under load, yeah. I tried messing with it myself, figuring it was just some buildup, but I couldn’t sort it out. Honestly, I ended up throwing in the towel and taking it to a workshop. Best decision I made! They ran some tests and sorted it out properly.
manfredschulze1 (community.author)
Took the Avantime to the shop as you suggested. Turns out, it was indeed deposits in the combustion chamber, just like I suspected. They cleaned everything up, and she's running smooth as butter now. Cost me about 425€, but worth every penny. Thanks for the advice!
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RENAULT
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AVANTIME
georgschulze8
Woah, that sounds rough! I had almost the EXACT same symptoms with my Avantime a while back. Knocking, power loss, the works! Did you try checking your cylinder heads? And what about the ignition timing? I remember playing around with fuel octane too, thinking it might be bad gas, but no luck. Engine knock can be a real pain!