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I have a customer with a 2004 Hyunda sonata 4cyl. It will not go over 30 mph at around 3000 rpm.

11/22/2011

I have a customer with a 2004 Hyunda sonata 4cyl. It will not go over 30 mph at around 3000 rpm. If you push it it will choke out and die, however you can "red line" it in park with no problem. They have replaced, oxygen sensors, tps, Mass air flow and the catalitic converter. It is a Non Serviceable fuel filter. The only trouble code that comes up is a system to lean bank 1. Any Ideas, there are curently getting a fuel pressure test.

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An additional check would be to drive with the air filter housing open to insure the air intake is not plugged with road debris. Plastic bags can be sucked into air intakes and cause loss of power.

Jim O'Neill
Chino Autotech Inc.