Abstract: To evaluate Electromagnetic Environment Effects (E3) of the vehicle ignition pulses on High Frequency Receiving Station (HFRS), a model of the vehicle ignition circuit has been analyzed, and frequency spectrums of the noises induced by a car and a truck at the moment of their engine being ignited were measured. Using the method-of-moments-based electromagnetic simulation tool, we have modeled the ignition-equivalent antennas by a car and a truck respectively and obtained their transmission loss fluctuation curves in the transmission path to a 10 m long monopole receiving antenna. In comparison, E3 of the engine ignition by two cars and a truck on HFRS in the countryside was measured. Simulation shows that the least transmission loss from the car and truck to the 10 m monopole antenna located 30 and 100 m away occurs at 7.5 MHz, which is 24 dB and 32.2 dB respectively. This measurement indicates that the emitting signal induced by the engine ignition of the truck is 14 dB higher than that of the car. In the distance of 30 m from the vehicle, the noise floor in the low frequency band is raised 1−2 dB. When the distance is increased to 100 m, the effect can be neglected.