03 7.3 Hard Starting - Ford Powerstroke Diesel Forum
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Old 09-24-2012, 11:39 AM
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03 7.3 Hard Starting

I have 185K miles on my '03 F350 dually w/7.3. It is hard starting when hot. Especially when only sitting for short time between starts. Intermittent problem (doesn't do it every time). When it does it I have to crank it a least 2 times to start. Truck runs great, no performance issues once started. What should I be looking for.
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Old 10-01-2012, 10:08 PM
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change the fuel filter
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Old 10-02-2012, 02:44 PM
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Basically, Hot ReStart issues often have to do with the HiPres oil (used to drive the injectors) "thinning" as it heats up. What this says is, that there exists a condition that is Marginally bad, and is just now showing-up because of the difference in viscosity.

It's about things like internal leaks in that system that are bleeding-off your pressure, failing sensors that read that pressure, or even the inability of the pump (HPOP) to make the pressure it should, as quickly as it should.

First thing to do is to get it on the proper scanner to monitor those pressures when hot (and compare to cold)...
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