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Old 06-21-2014, 04:50 PM
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No start

Ok I got a problem and am not sure what to do...Kind of at a loss..So drove the truck 250 miles and stopped on the way up to go camping to get lunch. When came back out the truck wouldn't start. So I was looking at my CTS Insight and I was only getting 300 PSI for fuel (I know you need 500 to start) well the guy I was with said let's jump it even though it was turning over fine but I said ok. Connected the jumper cables and it started right up. Got to the camp spot started and stopped all weekend no problem starting (this was at least a dozen times) so we get home and stop at a friends house and hang out for a little bit and came out to go home and it did the same thing only getting 300 psi so we hooked up the jumper cables but it didn't fire right off had to leave the cables on for a while and finally fired right off. So I Figured it must be the batteries still scratching my head I bought a new set and installed them and went to start it its still doing the same thing. Now here are my volts with both old and new batteries with the key on engine off 11.6 and with it running (when it was was 13.2 fluctuating down to 13 and once in a while dropping below that) I really don't know what to do. Can any of y'all help me much appreciated

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Old 06-21-2014, 05:10 PM
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You've got a HPO leak somewhere.
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Old 06-21-2014, 05:18 PM
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You think so dhanna? Man I dont even know where to begin. Not seeing any oil or would I

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Old 06-21-2014, 05:26 PM
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You won't see oil because the HPO system is all internal. Most common are the STC fitting on at the HPOP, dummy plugs or stand pipes.
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Old 06-21-2014, 05:29 PM
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High pressure oil is all internal. Have you ever changed the starter in the truck? Every 6.0 starter I've changed has made a dramatic difference in turn over speed. The original starters are different than their replacement. The new starter is a 6.4 starter.


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Old 06-21-2014, 05:33 PM
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Well I guess it dont matter about 6 months ago when doing the injectors i replaced the standpipes and dummy plugs with the new updated ones...man this is gonna suck..I'm not sure how to even troubleshoot that. I did notice even after replacing the batteries that fuel pressure didnt build above 190 this time around. Well I can put the old batteries back in and put that 350 bucks towards figuring this out

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Old 06-21-2014, 05:39 PM
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That's not fuel pressure you're reading, that is ICP which is the High Pressure Oil. You could possibly have a bad ICP sensor causing it to give false readings. Next time it does it, unplug your ICP sensor and see if it starts. If it does, replace the sensor. If it doesn't, you'll have to air test the system to find the problem.
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Old 06-21-2014, 05:54 PM
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Oh ok bud thanks for the help...guess I will try that in the afternoon and see if that works. Seriously thanks for the help either way I'm learning more and more about this motor. If it does require an air test I'm gonna have to break down and let someone else test it and pay for the troubleshooting it down to the cause as I still want to fix the cause..lol

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Old 06-22-2014, 01:03 PM
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Ok so I got up this morning and before I disconnected the ICP I figured I would see if it wouldn't start. Well it fired right off. So it sat all night does that change anything you think?

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Old 06-22-2014, 01:55 PM
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What year is your truck? What is your ipr% while cranking?


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