Audi A6 engine abnormal sound fault analysis

Audi C5A6 equipped with 1.8T engine and automatic transmission, driving mileage of 50000 km. Car owners reflect the engine in 2,3 gear acceleration have abnormal noise, the abnormal noise has lasted about half a month's time, through the OBD Diagnostic Tool to check, the sound becomes apparent.

After testing, in 2, 3 block accelerated heard engine abnormal noise, listen to the voice really like engine knock, but the power of the engine were not affected by any effect, accelerate the engine sound all normal. Combined with the failure analysis, the engine at 2,3 gear acceleration can send different sound There are several reasons:

(1) variable valve timing mechanism fault. Because in the 2,3 gear acceleration engine has entered the medium-load conditions, according to the characteristics of the engine, the valve timing should have entered the adjustment position, adjust the mode by changing the position of the chain tensioner to achieve. According Launch X431 V Pro or Launch X431 IV GX4 tool check, found that when the chain camshaft adjustment, if the chain tensioner lack of strength will make the chain in a relaxed state in the adjustment process and beep.

(2) Since the engine knock sound is generated. That there are several possibilities: ① fuel octane low lead to knock. This car's engine may be use 93 unleaded gasoline, it is best to use 95 unleaded gasoline, otherwise it will produce detonation. ② ignition timing is premature detonation. To further understand the failure, you can use Autel MaxiScan MS509 or Autel MaxiScan VAG405 tools to detect, which can quickly check out the car parts problem.
Source: http://www.focalobd.com/blog/audi-a6-engine-abnormal-sound-fault-analysis/

How to buy high-quality car brake oil

Speaking of automotive brake systems, we naturally think of the importance of the brake pads, it has been a normal reaction to contact with safety, another key element for automobile brake system -- brake oil , people don't really care, but don't know it is a key link in automobile braking systems, the relationship between the owners of personal safety. According to Transportation Department data shows that If all people use the brake oil, every year to reduce the 10% traffic accident, how to buy high-quality brake oil, need to use Auto Diagnostic Tool.

Currently on the market the brake oil is divided into three types: type of alcohol, mineral oil and synthetic type. Alcohol and mineral oil has been eliminated, market of brake oil for the synthesis of type, common brake oil have DOT3, DOT4, DOT5, most of the cars used are DOT4 brake oil.

How to buy brake oil?
1, different types and different brands of brake oil do not mix, due to the different synthetic ingredients, mixing brake fluid can cause brake oil index declined, If you use the Launch Creader VII or Launch X431 Creader VIII tool, it's easy to see the change.

2, the normal running of the vehicle, If the brake suddenly light or suddenly heavy, to the timely replacement of brake oil, before replacement, first with alcohol will brake system clean.

3, when the brake oil sucked moisture or impurities, should be replaced or the filter, otherwise it will cause the brake pressure insufficiency, the effect of the brake. There are some places the weather is wet, this is particularly important.

4. Vehicle braking wandering, to the braking system to conduct a comprehensive inspection. If discover wheel cylinder cup expansion is too large, brake oil quality there could be a problem. At this time should choose quality good brake fluid replacement, replace the leather bow at the same time.

Clean, high-quality brake oil is the basic of good work condition of safety and brake system. Vehicle on 40,000 km or brake oil continuously used for more than two years, then the brake oil needs to be replaced. When choosing the brake oil to note that if the use of inferior brake oil, brake pump will rot burning Pusey, use Autel MaxiTPMS TS501 or Autel MaxiTPMS TS601 tool to check the brake pump to see whether the work is stable, will also have an impact on the brake effect, so if the brake oil lack, it is best to specialized shops to buy the original car brake oil, the original brake oil use effect is very good, can also prolong the service life of the system of brake.
Source: http://www.focalobd.com/blog/how-to-buy-high-quality-car-brake-oil/

What are the reasons for auto body shake

Auto Body slight jitter situation many owners often encountered. If the owners to start the vehicle or the vehicle is not suspended off the engine case, if you find a slight shake the car body, it may mean that the following three conditions exist vehicle:

If the driving process, found the body there is a slight jitter or offsets, it is generally caused by tire failure. First, the tire may be poor balance, you need to go as soon as to the car repair shop to do the wheel alignment and balancing, there is a simple way, using Auto Diagnostic Tool to do a correction.

Another condition is more serious, possibly because rim distortion, which requires owners to go to a professional repair shop to check. This situation generally occurs in the use of five-year vehicles. General motors to replace the new tires, new rims when to do a tire balance, otherwise the weight does not mean when the steering wheel is prone to jitter phenomenon. The body jitter can have an effect on driving comfort and control judgment. There is also a simpler way, using the Launch X431 GDS or Launch X-431 PAD tool to check whether the tire is balanced, if the balance, is not required to the repair shop.

The third case is because the transmission shaft deformation caused by the imbalance, it typically occurs in the chassis of the car had a collision.

If there is to start car the body shaking, the fault is for equipment manual transmission vehicles, such as: from static started and slowly lift the clutch pedal, the vehicle vibration. This is due to a clutch three piece suit (flywheel, clutch plate and pressure plate) the irregular wear, in which one or a few pieces to produce deflection caused by, in the bonding process, clutch disc can not be smoothly joined, but a joint, a little and release of the engine power is just beginning to transfer, and suddenly slipped, replace the clutch three sets of damage, in using Autel Maxidiag Elite MD701 or Autel AutoLink AL609 tool for the detection of gearbox is working properly.
Source: http://www.focalobd.com/blog/what-are-the-reasons-for-auto-body-shake/

Honda car air conditioning refrigeration malfunction maintenance

Honda automobile air conditioning refrigeration failure phenomenon. After filling refrigerant. Open air conditioning, on the electromagnetic clutch compressor suction no, idle speed is high and low (850 r/min to 1100 r/min), the fan rotation is normal, but poor refrigeration, you can see the real-time data by OBD Diagnostic Tool.

Detection of electromagnetic clutch of the compressor line, the voltage is normal. After the failure of the circuit is determined, the high and low pressure port of the air conditioning system is measured by using multi meter.. As a result, the pressure at high and low pressure is abnormal, and the pressure is high and low, and under the Launch X431 Diagun III or Xtool PS2 tool checked, the engine was found to rotate abnormally. Ask the driver, there is no phenomenon before the refrigerant filled, and then suspect that there may be too many refrigerants.

Gradually sucked out of a portion of the refrigerant, the engine speed changes observed in the tool to see a few bubble, accelerate to 1700 r/min when bubbles disappear, troubleshooting.

When the air conditioning system of the refrigerant injected too much, it will reduce the flow of refrigerant in the system performance, causing the compressor malfunction, poor refrigeration, the engine idle speed instability, You can check with the Autel MaxiSys MS908 or XTOOL VAG401 tool before you inject the refrigerant, and it will remind you how many refrigerants you should add.
Source: http://www.focalobd.com/blog/honda-car-air-conditioning-refrigeration-malfunction-maintenance/

zfak6-90 and zfs6-90 type gearbox use and maintenance guide

A, use and maintenance
zfak6-90 and zfs6-90 type gearbox is of conventional structural gearbox, and is therefore generally the same gearbox, in use, should pay attention to two issues, a car is driving is prohibited in the engine flameout neutral glide. This is due to the type used in automotive hydraulic power steering system and braking system, once the driving engine flameout, power steering immediately failure, in case of emergency prone to heavy steering caused the accident. You can use the OBD Diagnostic Tool to check the gearbox working state. The engine is stalled and the air compressor is not working, such easy to cause failure of brake failure.

On the other hand, from the gearbox working angle, the car engine flameout and gearbox put it in neutral condition of high-speed planing, as the engine flameout, gearbox a shaft stop rotation, countershaft also stops rotating and the second shaft gear all cease to spin, and the second shaft is in driving sliding car driven by high-speed rotation. Due to the gearbox all the gears are in a resting state, splash lubrication can not be generated, such a biaxial within each gear shaft hole needle roller bearing is not enough lubrication and burning loss soon.

Similarly, when the car engine failure was not working properly, the car must be hauled driving, drag distances over 100 meters, must be drive shaft and the driving axle connecting flange apart, the rope bundle of drive shaft on the beam of the automobile, drive axle and drive axle disengaged, drag speed shall not be more than 60 km / hour. Otherwise, also easy to cause biaxial needle roller bearing damage. You can use the Launch X431 IV GX4 Master or Launch X431 V Pro tool to check whether the car engine has a problem.

During the maintenance should be careful to check the level of gear oil. Transmission gear oil that is not the lack of nor Cadogan. Lack of oil caused by early wear even burning fault, oil too much prone to gearbox overheating. In a gas plug on the side of the gearbox, the oil level when the car park in a horizontal position should be in the height of the plug position. There is a drain at the bottom of the gearbox plug. New car during 2000 ~ 2500 km, the first force to maintain the new oil transmission gear oil should be replaced. Oil change the best operating mode in a hot car. Must according to the actual conditions and according to the provisions of the oil gap period.

B, gearbox oil
Gearbox lubrication using gear oil. ZF type gearbox use the international standard aplgl - 4 grade, viscosity grade sae85w / 90 indicator of gear oil. You can use the Autel MaxiSys Pro MS908P or Autel MaxiDas DS708 tool to check the gearbox lubrication working state.
Source: http://www.focalobd.com/blog/zfak6-90-and-zfs6-90-type-gearbox-use-and-maintenance-guide/

Common method for cleaning automotive fuel injector

After vehicle driving for a long time, the fuel injector outlet is usually bonded with some carbon deposits, gum grease and other debris, will lead to fuel injection nozzle fuel reduction, affect vehicle acceleration performance, but also a serious engine can not be normal operation. Therefore, in daily vehicle maintenance, require frequent use of Auto Diagnostic tool check the car performance, especially in the automotive fuel injectors need to check.

Fuel injector cleaning is usually lorry wash and ultrasonic cleaning both methods, along with the car cleaning to use special EFI car wash liquid, Its advantage is not need to be removed from the car fuel injector, and the operation is convenient; drawback is cannot directly observe the working state of the fuel injector, and the effect is not ideal.

Ultrasonic cleaning is the injector removed from the engine installed on the ultrasonic cleaning tank cleaning, Its advantage is high cleaning quality, still can put fuel injector to injector test bench for fuel injection quantity, leakage and Spray testing situation; the disadvantage is expensive equipment.

We can choose with the carburetor cleaner cleaning injection device. Optional qualified carburetor cleaner, spray evenly on the injector, the effective removal of grease and soot and other plastic material, after the cleaning is done, you can use Launch X431 Creader VI+ or Launch Creader V+ tools check the injector working conditions.

The specific method is:
a, Remove the injector from the engine;
b, dedicated connector carburetor cleaner tank and injectors;
c, The carburetor cleaning agent is sprayed into the injector, check the amount of leakage in the injector is not energized condition;
d, intermittently energizing the solenoid injector, let carburetor cleaning agent injector spray atomization while observing their situation.

There are many types of cleaning agent now, generally in the bottle are indicated, so owners need to look carefully at the time of purchase to understand the characteristics of the cleaning agent, do not buy low-quality cleaning agents, to avoid unnecessary losses, you can use Autel Maxidiag Elite MD703 or Autel Maxidiag Elite MD702 Tools check the injector, it will prompt the purchase of which a cleansing agent.
Source: http://www.focalobd.com/blog/common-method-for-cleaning-automotive-fuel-injector/

Cleaning the car air conditioning condenser matters needing attention

For their own health, some owners will clean car air condensers, that's right, if you do not know how long it cleaned once, you can use the OBD Diagnostic Tool testing the performance of the automobile air conditioning, but on the cleaning agent to pay attention, the best use condenser cleaning agent.

Condenser cleaning agent safety environmental strong detergents, can dissolve quickly remove all kinds of heat transfer equipment and pipe scale, rust and other deposits, carbon steel, stainless steel, copper, iron and other metal almost no corrosion, different cleaning requirements can be used to clean the object with different proportions to achieve optimal results. After washing finished, use the XTOOL PS2 or XTOOL VAG401 tool to check the performance of the car.

According fouling situation, diluted 1 - 10 times the use does not affect the cleaning effect, but will extend the cleaning time. Can be used to clean all the circulation, can also be used for soaking and scrubbing. Even for a long time and a metal contact nor on metal corrosion.

If you use other cleaning agents, may be due to high alkaline ingredients, and damage to some of the components, so be sure to choose the right cleaning detergent, in peacetime, you can use the Autoboss V30 SPX or Xtool PS100 tool to check car various components, to see whether you need to replace the to avoid accidents.
Source: http://www.focalobd.com/blog/cleaning-the-car-air-conditioning-condenser-matters-needing-attention/