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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Sat Mar 25, 2017 8:54 pm 
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Engines in time, crank an cam an right ..no fuel pressure at port, dont have that kindof scanner, gettin spark on all 6....power at pump

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Sat Mar 25, 2017 9:01 pm 
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I covered all that in the begining of the post tho....now im just lost...like i have no clue what to do next my friend said it could be either the wired from the csp or ecm

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Sat Mar 25, 2017 9:24 pm 
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Urlildogtwo wrote:
Engines in time, crank an cam an right ..no fuel pressure at port, dont have that kindof scanner, gettin spark on all 6....power at pump

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Did you pull the valve covers and verify correct engine timing?

The pump is commanded on /off and for different length of time depending on key position.If you can hear the pump running why is there no fuel pressure? Need to check the pressure at the pump itself by dead heading it to a gauge.The KJ uses a returnless system.


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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Sat Mar 25, 2017 9:32 pm 
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See thats the issue you can hear the pump turn on everytime...an i just replaced the pump an filter

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Sun Mar 26, 2017 5:37 am 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
Hearing the pump is one thing.

Getting actual measurable fuel pressure is a another completely different thing.

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Thu Mar 30, 2017 6:09 pm 
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I don't see any place where you checked the ASD? If I missed that, sorry. If you haven't, swap the blower relay with the ASD (auto shut down) relay.


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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Thu Mar 30, 2017 6:25 pm 
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No i havent checked that....what is that? Where do i find it?

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Thu Mar 30, 2017 6:28 pm 
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We dont have that on the jeep....i dont have an asd

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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Thu Mar 30, 2017 7:39 pm 
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Urlildogtwo wrote:
We dont have that on the jeep....i dont have an asd

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Underhood fuse box,one of the big relays.Without it your KJ will not start as that is the main conduit for the PCM to start and run the engine.


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 Post subject: Re: Please help me with my 2004 kj 3.7 cant get it to start!
PostPosted: Fri Mar 31, 2017 2:09 pm 
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tjkj2002 wrote:
Urlildogtwo wrote:
We dont have that on the jeep....i dont have an asd

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Underhood fuse box,one of the big relays.Without it your KJ will not start as that is the main conduit for the PCM to start and run the engine.


^ what he says. The function of the ASD is to prevent fires in the event of a crash. If the PCM detects there is fuel pressure for 1.8 seconds without the engine running, it triggers the ASD circuit, shutting down injectors, fuel pump, and ignition. If the relay is bad, you will get the same results. Likewise, if you turn the key on and hear the pump prime, leave the key on, and don't try to start it within about 2 seconds, it will trigger the ASD as well. Right. It won't run.

The ASD relay is a standard 5-pole relay, it's the same relay as used for the blower (heater and AC) motor. Swap them out and see if it changes anything. If so, then go get a new one for about $10. If it doesn't, you've eliminated one more thing.

From another thread her on LJ:

Image


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