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Questions & Answers
2004 Santa Fe 2.4l. Why does it have intermittent rough idle, hard misfires, and lack of power especially when under load?
It isn't wise to get too preoccupied with fuel pressures - ok the pump needs to maintain the right pressure but it is also important the pump delivers sufficient volume of fuel that the pressure is maintained under full throttle conditions with enough reserve circulating back to the tank to keep the system cool and prevent vapour locks.
A healthy pump will fill a half gallon jug in a few seconds and that test is the essential other half of the fuel system test.
A reduced volume or pressure could indicate a dirty fuel tank...
The pressure test isn't complete until the peak pressure has also been tested and the pressure regulator vac on and vac off proved ok. The rail pressure should be maintained with the pump off and the supply closed - if it doesn't, it indicates a leaking regulator or a dribbling injector.
Once the fuel delivery has been passed ok, the fuel injectors should be removed and tested. An injector has a useful life on average of 70/80,000 miles, after which the spray patterns deteriorate - a poor spray pattern has larger droplets that burn much slower and behave like a lean mixture.
Hyundai Cars &...
on Nov 21, 2020
2017 Elantra. Why did check engine light turn on?
Check light switches on when the engine management computer detects a fault likely to affect the exhaust emissions.
When the check light switches on a fault code is stored in the memory and the system switches to the get you home programme.
The first step towards a diagnosis is to get a code read...
Hyundai Cars &...
on Nov 15, 2020
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