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Thread Title:

Lack of power


Created On Saturday September 26, 2009 19:54 Diesel Talk
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highway77
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Posts: 21
Joined: Jun 2008

Note Saturday September 26, 2009 19:54 View thread in raw text format
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I work at a shop and there is a customer that has come in with a complaint of a lack of power in a 2007 pro star with the ISX. There is a code in the ECM for low fuel pressure. We did some checks as per the insite program and found that there was a faulty preessure regulator, we changed that and still the same problem. The two pressure sensors have been changed by the dealership adn still have not made a difference. Any suggestions as to possible checks or common problems.
SEANN
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marc7242
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Posts: 254
Joined: Sep 2008

Note Monday September 28, 2009 15:51 View thread in raw text format
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The lift pump and the pressure pump are common failure items on these motors. There are also some filter screens and check valves in the IFSM. This can also be caused by overall problems in the fuel system. Run cutout tests because compression can come back up through injector tips on these. Not easy engines to diagnose unfortunately. You'll have to run it with a pressure gauge on it to verify repair. Its good to have a low pressure gauge between the lift pump and the pressure pump. Bear in mind the lift pump doesn't necessarily run all the time on these.

marc
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