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Bigbear1 03-11-2014 02:25 PM

no start
I am working on a 2004 Jeep Grand Cherokee with a 4.7l engine. Customer states that it was running then just quit. Engine turns over fine but it acts like it is flooded. Plugs are dry other then being black like it was running rich. I have injector pulse and compression is roughly 150psi in each cylinder. No codes are present. Fuel Pressure while cranking is 52psi. Replaced cam and crank sensors.

Frango100 03-11-2014 04:08 PM

Re: no start
1 Attachment(s)
Welcome to the garage.
Does it give spark? Did you check for the 5v reference voltage signal which is used for the cam, crank, MAP, engine coolant, intake air temperature and TPS? See attached schematic.

Bigbear1 03-11-2014 07:59 PM

Re: no start
yes they have a 5 volt reference signal and I have spark

Bigbear1 03-11-2014 08:00 PM

Re: no start
yes I do have a 5 volt reference and I have spark

Frango100 03-11-2014 09:24 PM

Re: no start
It is strange that you have injector pulse, but the plugs are dry. Did you check the valve timing already?
Does the tach move a bit when trying to start?

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