Question about 1995 Jeep Grand Cherokee

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2001 grand cherokee laredo 3.1 diesel would not start

Injection pump and injectors checked cleaned, calibrated by specialist diesel service centre. I do not have the timing specs to check the installation of the pump. The cranks but would not start.

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  • silver top May 11, 2010

    hi from uk have read bcally1 reply and he mentioned the engine you have is cummins ? not familiar with your model however here in uk the cummins engines i have worked on are on hgv trucks and i am conversant with fual systems not sure if this is related to car cummins engines but the fuel injectors are under the rocker covers and are rocker operated there for req periodic re torque just like tappets the torque is in inch pounds andif left for too long power falls and poor starting due to injectors not atomising correctly so if new injectors and seals fitted ? make sure the injectors were re torqued as to each cylinder firing order and reset tappets at same time all above as i have said is the cummins engines here in uk trucks and not sure if same fuel system pump/injectors are same in the vehicle you have ?

  • Richard Scordino May 11, 2010

    one other thing... make sure your battery if fully charged and the engine is turning fast enough... diesels don't like to start if turned too slowly!

  • Richard Scordino May 11, 2010

    If a specialist went over it already, was it running when they did that? If not, why did they "abandon" the job?? How was it running before this happened?
    If you want to "play" with fuel timing yourself, make sure you mark where everything was so you can return to that point if need be.

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It could be that one of the injectors is bleeding off pressure not allowing enough fuel pressure to start. the 5.9 and 6.7 cummins need at least 2000 psi to start

Posted on Jan 08, 2009

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Before removal of the fuel injection pump, I am assuming that u checked to see which fuel line was for which cylinder on the fuel injection pump. Well if this was done, place ur #1 cylinder on compression and at the sametime spill time ur fuel injection pump so that #1 will be the next outlet to dis-charge fuel. After this is done, insert the fuel injectrion pump, and ur job is now complete. IF ur front cover is off, there are usually markings on the gear of the fuel injection pump in order for the markings to be alligned

Posted on Jan 08, 2009

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