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  #13  
Old 07-15-2013, 05:29 PM
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Quote:
Originally Posted by Frango100 View Post

This is partly true. The engine coolant temperature signal is used by the PCM to calculate the fuel injector pulse width, spark advance, the idle air motor position and fuel prime shot pulse width. Throttle position will not be changed though.
You mentioned the strong fuel smell at startup, so there is fuel, but maybe not under the right pressure. I would start doing the fuel pressure check first.
Also when a new fuel pump is needed, you could just change the fuel pump cartidge and not the whole module. Will be significantly less expensive.
Is this coolant sensor tied in with the gauge on the dash.
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Old 07-15-2013, 05:32 PM
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Re: 2001 Grand Cherokee 4.7L Hard Start

A good working fuel pump can handle some internal fuel leak inside the pump assy. You will only discover the leak during startup (takes longer) and the fuel pressure check.
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Old 10-14-2013, 10:30 PM
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Re: 2001 Grand Cherokee 4.7L Hard Start

Found the hard starting problem at least for my 2000 GC 4.7L.

Mine was a leaking injector also found that the leaking injector and 2 other injectors OHM readings were to high. All the injectors but 3 OHM readings were about 12.9 OHMs, the other 3 faulty injectors readings were around 18 OHMS

It starts first time every time now.

SIDE NOTE- I changed the O-ring in fuel pump as well as new fuel pump motor, New fuel filter/pressure regulator, New coolant temperature sensor. THEN read about leaking injector (did my own testing procedure to locate the problem) found one and the other 2 as said and problem solved.
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