Question about Hyundai Motor 1990 Sonata
The car over revs from normal idle upto 4500 rpm back to 2000rpm back upto 3500rpm and generally all over the place and this happens just in the garage with no foot near the accelerator , I had two qualifed mechanics look neither were sure although one thought it was the purge control solenoid so changed that with no result hopefully someone will have answer thanks
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Posted on Jan 02, 2017
It may take as much as 60 PSI to overcome the fuel pressure regulator. No, you can't blow through it. I suspect you have a fuel starvation issue. It could be a clogged fuel filter. It may more likely be a pressure leak inside the tank. That pressure gauge you mentioned comes highly recommended at this point. There is a flexible line connecting the pump to the metal line in the tank. If it ruptures, you have only minimal pressure, and the vehicle starves for fuel. Using the gauge, turn the ignition on and off a couple of times, (do not start) If the filter is choked, you will still achieve pressure to overcome the regulator. If it never makes that much pressure, then it is the flex or the pump itself. My first experience with this I found the rupture after the third pump! Embarrassing!
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Posted on Dec 30, 2008
mcdevito75 here, Sounds like the idle speed motor or the idle speed sensor is no good. Your local shop can check this out for you.
Posted on Jun 17, 2010
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