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Audi TT car accelerates bad Fault Example

Failure phenomenon: a 2007 annual Audi TT car, equipped with 2.0T engine and six-speed manual transmission, mileage 47000 km. Say users, the vehicle speed is very slow acceleration, high speeds without problems.

Check Analysis: drive road test author found that the vehicle speed is not slow, the speed can easily reach 160 km / h. Six months before users reflect the acceleration feel powerless, not before enough power, then driving road test by the user. I found the user’s driving habits engine speed is less than 2 000 r / min on upshifts, if not then rises to a certain speed, you will certainly feel the lack of acceleration power. Explain to the user should be appropriate to increase the engine speed after an upshift, he said before the user is doing so, I feel very full power, and power is now different from before, and certainly there is a fault.

using the fault diagnostic testing, fault code is not stored, view data streams found no abnormalities. Consider the vehicle has traveled nearly 50,000 km, you can start with a clean and basic maintenance to avoid demolition to remove coke in the cylinder and the exclusion of some of the possible causes, but these operations were finished posterior test has not changed. I consider, or should carefully study the data stream to focus the signal of the air flow meter and found that when the value of idle air flow meter is 2.5 g / s, the value can reach 70 g / s hard acceleration, these are normal . But after also found a problem that when the rapid acceleration, the engine response is slow sense the accelerator pedal has just stepped down, and so the engine speed exceeds 3 000 r / min, the value will soon acceleration response of the engine, an air flow meter also at the moment the engine speed reaches 3 000 r / min after reached 70 g / s. So, what kind of reaction if the air flow meter will be pulled out of it? Unplug the air flow meter harness connector rapid acceleration, the engine’s response time is faster than the chips in the air flow meter, the engine speed exceeds 3 000 r / min after sticking is better when the air flow meter good condition.

FIG 1

Through the above comparison check, I believe that the problem of air flow meter, if the replacement of the air flow meter, the engine acceleration response will certainly improved. Audi TT but not air flow meterStock, orders the price is 2000 yuan. Remove the original car air flow meter, air flow meter can be seen that many of the interface (FIG. 1) is thicker than the air flow meter orifice Bora 1.8T car engines, but they are Bosch products. Open the air flow meter, the sensor can be seen, although different numbers, but can not see the difference between the shape (FIG. 2). Multimeter with two measuring pins sensors, measurement data of the same, indicating that indeed universal, Bora and an air flow meter price of only 300 yuan.

FIG. 2

Troubleshooting: Polaris the air flow meter sensor on the air flow meter to replace the original car, and the road test can be when you see rapid acceleration fast engine response, so far troubleshooting.

(Generation Sea World)

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