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Old 10-07-2014, 11:33 AM
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Exclamation my 2000 jeep grand cherokee

i have a 2000 grand cherokee laredo 4.0 and i have replaced everything from the fuel pump to the crankshaft sensor,cam shaft sensor coil rail o2sensor, fuel filter and spark plugs. i have had so many codes pop up on me and worked them out now my truck will idle no problem for a while and i get po171 and po174 codes then it starts to run like crap, on top of that it has trouble on take off till i get rpms up. is there anyone that could tell me what to do? i even reset the computer to factory so could it be the computer is learning the system over being factory set

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Old 10-08-2014, 07:49 AM
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Re: my 2000 jeep grand cherokee

Welcome to the garage.
Your jeep is a WJ, so better to put your questions overthere.
You did change many of the components already. Did you measure the fuel pressure at the rail? If that is ok, i would suspect the MAP sensor. This is the number one factor for the PCM to calculate the injector pulse.
If you have a scanner which shows live data (or android phone with Torque app and bluetooth dongle), you can check the MAP with engine off (ignition on) and compare to the local atmosferic pressure. You could try cleaning the MAP first and see if that makes any difference.
Attached Files
File Type: pdf MAP sensor.pdf (123.1 KB, 3 views)
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