Jimny Power Loss & Smoke Linked to Engine Knock

Had similar symptoms on a 2017 Suzuki Swift with the 1.4L engine. The knock sensor triggered warnings initially, but inspection revealed carbon deposits in the combustion chamber causing irregular detonation. The engine knock was particularly noticeable during acceleration. The root cause turned out to be a combination of low-grade fuel octane and carbon buildup on cylinder heads. The repair required removing the cylinder heads for thorough cleaning and combustion chamber service. This was a serious issue that needed immediate attention to prevent potential engine damage. Key findings from the diagnosis: Carbon deposits disrupted proper combustion, Knock sensor readings were accurate, not faulty, Engine timing was affected by deposit buildup, Fuel quality played a significant role Recommendation: Get comprehensive diagnostics focused on combustion chamber inspection. The symptoms match classic carbon deposit issues, which can severely impact engine performance if left unchecked. Consider switching to higher-grade fuel after repairs to prevent future buildup.

Thanks for sharing that experience with the Swift. Your symptoms definitely sound similar to what I had with my Jimny last month, rough running and piston slap noises that turned out to be pre-ignition issues in the combustion chamber. Mind sharing what the total repair cost was for your case? After my mechanic cleaned everything up and adjusted the timing, I am still a bit nervous about potential recurring issues. Have you had any problems since the repair was done?

Great news, since getting the repairs done, the engine knock issue has been completely resolved. The total cost came to 425€ for cleaning out the combustion chamber deposits and recalibrating everything. This included a thorough cleaning service and engine tuning to ensure proper combustion timing. The experience taught me to be more selective with fuel quality. Using higher octane fuel since the repair has helped prevent any recurrence of the problems. Its been running smoothly for over 8 months now with no signs of detonation or irregular combustion. The investment was worth it considering the potential damage that could have occurred if left untreated. Proper maintenance and quality fuel really make a difference in preventing these carbon deposit issues from developing again. If youre still hearing concerning noises, might be worth having the mechanic do a follow-up check of the combustion chamber to ensure all deposits were fully removed during the service.

Thanks everyone for the helpful insights. After taking my Jimny to the mechanic last week, they found heavy carbon deposits in the combustion chamber causing the knock sensor to trigger. The piston slap sound was actually from early detonation due to those deposits. The repair cost me 580€ total, they did a thorough clean of the combustion chamber, replaced the knock sensor as a precaution, and adjusted the timing. The mechanic also recommended switching to higher fuel octane grade to prevent future buildup. Been running much smoother for the past week with no more jerking or smoke. The engine knock is completely gone too. Will definitely stick to better quality fuel from now on. Really glad I got it checked out before any serious damage occurred. Thanks again for helping point me in the right direction with the diagnosis.