How to find air leaks on any machine / Vacuum leaks. How to find on any machine
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Air leakage is a fairly common occurrence, which can be easily confused with other malfunctions based on its symptoms. With a small leakage, as a rule, all symptoms disappear when the throttle is fully opened. However, if the revs are around 2000 and above and do not drop, there is a break in some hose to the intake manifold. Understanding the principle, it is quite easy to find and fix such a problem. Unaccounted for by the ECU air will enter the manifold. As a result, the computer will increase the fuel supply until stoichiometry is achieved. If it is impossible to connect diagnostics to the ECU (old car), with such symptoms I would start with a physical search for a leak (spraying all connections and pipes to the intake with carb cleaner or water: hoses, throttle, gaskets, vacuum tube). If it is possible to connect a scanner, it is worth paying attention to the change in fuel trim parameters at idle and when the throttle is opened. Vacuum leakage is quite a frequent phenomenon, which, due to symptoms, can be easily confused with other malfunctions. With a small leak, as a rule, all the symptoms disappear with the full opening of the throttle. However, if the rpm are kept around 2000 and above and do not fall, there is a breakage of any hose to the intake manifold. Understanding the principle, it is easy enough to find and eliminate such a nuisance. Unrecorded ECU air will enter the collector. As a result, the computer will increase the fuel supply until stoichiometry is reached. If it is impossible to connect the diagnostics to the ecu (old car), with such symptoms I would start with a physical search for a leak (pushing with a carbliner or water all the connections and nozzles before the inlet: hoses, throttle, gaskets, woo). If you connect the scanner is possible, you should pay attention to changing the parameters of the fuel correction at idle and when you open the throttle.
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