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What Causes a Car to Have No Cylinder Pressure?

2 Answers

McEmmett

07/25/25 3:57pm

There are several main reasons that can cause an engine to lose cylinder pressure, including issues with the engine's mechanical system, fuel system, intake system, ignition system, and electronic control system. Additional details are as follows: 1. Hazards: Running an engine with a missing cylinder can cause significant harm. Firstly, it increases fuel consumption and emission pollution. Secondly, fuel may enter the oil pan, contaminating the lubricating oil, shortening its service life, and accelerating the wear of moving parts. Thirdly, unburned fuel may combust in the exhaust pipe, damaging the catalytic converter. 2. Diagnosis Methods: Diagnosing a missing cylinder is relatively straightforward. Generally, while the engine is running, the spark plug wires or fuel injector connectors are sequentially disconnected. A functioning cylinder will show a noticeable reaction when the spark or fuel supply is cut off, whereas a non-functioning cylinder will show little to no change. Another method involves using an infrared thermometer to measure the temperature of the exhaust pipes. The exhaust temperature of a non-functioning cylinder will be significantly lower than that of a functioning cylinder.

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Frank

08/11/25 9:38pm

My old car also had cylinder compression issues before, mainly due to piston ring problems. After running over 100,000 kilometers, the rings were severely worn, causing air leakage and low compression. Another time, the valves didn't close properly due to carbon deposits stuck on the valve seats, leading to sealing failure. A blown head gasket can also cause this, especially in cars with fluctuating coolant temperatures. If the cylinder walls are scratched from cylinder scoring, pressure definitely won't hold. When I replaced the piston rings last time, it cost over 2,000 RMB including parts and labor. The mechanic said regular oil changes can slow down piston ring wear. If you hear metallic knocking sounds from the engine, get it checked immediately - delaying will cause more damage.

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Does the 2020 Tiguan L330 have a particulate filter?

The 2020 Tiguan L330 is equipped with a particulate filter to meet the China VI emission standards. A particulate filter is a ceramic filter installed in the diesel engine's emission system, which captures particulate emissions before they enter the atmosphere. It can reduce the soot produced by diesel engines by more than 90%, and the captured particulate emissions are subsequently burned off during vehicle operation. Diesel engine pollution mainly comes from three sources—particulate emissions, hydrocarbons (HCx), nitrogen oxides (NOx), and sulfur. Among these, particulate emissions (soot) are mostly composed of tiny particles of carbon or carbon compounds (smaller than 4-20μm). How the particulate filter works: The diesel particulate filter is coated with metals such as platinum, rhodium, and palladium. The black smoke containing carbon particles emitted by the diesel engine enters the exhaust particulate filter through a dedicated pipe. After passing through the densely arranged bag-type filters inside, the carbon soot particles are adsorbed onto the filter made of metal fiber felt. When the amount of adsorbed particles reaches a certain level, the burner at the end automatically ignites, burning off the carbon soot particles adsorbed on it, converting them into harmless carbon dioxide that is then expelled. To check whether the 2020 Tiguan L330 has a particulate filter, you can use the following three methods: Check the Owner's Maintenance Manual and Owner's User Manual to see if there is a particulate filter function. Additionally, you can carefully review the fault codes in the manual to see if there is a "particulate filter" warning light indicator. Check the label on the oil filler cap. If the oil cap clearly states 0W-20 grade oil, it indicates the presence of a particulate filter. Look behind the three-way catalytic converter on the exhaust pipe to see if there is an additional cylindrical section. If there is, that is the particulate filter.

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Which retains its value better, the large emblem or the upright emblem on the Mercedes-Benz E300?

Mercedes-Benz C-Class, E-Class, and S-Class sedans all offer two styles for consumers to choose from: the large emblem and the upright emblem. The large emblem looks more sporty and bold, while the upright emblem appears more elegant and dignified, suitable for business occasions. The following factors affect the resale value: 1. Brand influence: Brand influence is one of the decisive factors for resale value. Generally, French cars rank lower than American cars, which rank lower than domestic cars, which rank lower than German cars, which rank lower than or equal to Japanese cars. Currently, the luxury brands with better resale value in the market are Mercedes-Benz, BMW, and Lexus, with Audi in the middle range, while Cadillac, Infiniti, Acura, and other luxury brands have relatively lower resale value. 2. Vehicle ownership: Vehicle ownership, or sales volume, is the result of cumulative sales over the years. Generally, the higher the vehicle ownership, the higher the resale value, although some niche cars with special value (e.g., Renault Mégane RS, Mitsubishi EVO9, etc.) also have very high resale value. The Mercedes-Benz E-Class has relatively high ownership, so its resale value is also relatively high. 3. Configuration and color: Top-tier models, due to their higher original prices, tend to depreciate more than mid- or low-tier models of the same series. Additionally, if the color of the car is too unconventional, it can also affect the resale value.

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