Motor Vehicle Maintenance & Repair Asked by user60481 on May 13, 2021
My work’s Peugeot 107 5-speed manual is running on 2 cylinders instead of 3. I know this because it produces noticeably less power than a Toyota Aygo that I drive occasionally that has the same 998cc 1KR-FE engine. Also it sounds different than the Aygo’s engine, and the engine is shaking more than normal.
I know that the car has driven with a low oil level, because I noticed the oil warning light came on occasionally when driving in corners and when braking. (Probably because of oil sloshing around). I ended up adding about 2 liters, now the oil level is right on the max.
When looking for common issues with this car, I only found a rough idling engine to be a common fault, but this isn’t really my problem. When idling, the car remains at the same RPM. I couldn’t find any other engine related common faults, so my guess is that this issue has to do with the low oil level it has been driving with. Is this a reasonable assumption or should I be looking elsewhere? And what should I be looking at?
Does anyone have experience with this car or had similar issues and what was the cause? Any help appreciated!
UPDATE (7 december 2020): I haven’t had the chance to look at the spark plugs, because the car has developed more issues: the clutch is broken; the pedal feels weird and it won’t disengage the clutch. Also it’s impossible to put it in gear. The car will be towed to a garage, where the issues will either be fixed, or the car will be scraped. Depending on the costs of the repairs.
Low oil might potentially damage an engine so badly that there is a loss of power. In such an unlikely case, there will be blue smoke coming from the tailpipe due to warn cylinders and poor compression. I did have a car with this condition, years ago, but the loss of power was slight and the bigger issue was loud ping (detonation) on the highway. In your case, there would be a "check engine" light.
If the car has been burning some oil over time, the engine probably has carbon deposits that will lose power and create rough idle. How did the spark plugs look when you replaced them? If blackened, carbon is definitely an issue.
Cleaning carbon can be difficult. Start by changing the crankcase oil, substituting 20% with automatic transmission fluid (ATF) for 500 km and then changing the oil and filter again. Also add ATF to the fuel tank at a treat rate of 8 ml per one liter of gas and drive the car aggressively for one tankful. If power returns noticeably, continue to use your favorite fuel injector cleaner in the gas for a few more tankfuls. For faster results, spray cleaner slowly through the induction tubing at high idle.
Answered by Carguy on May 13, 2021
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