7.3 Hard Start
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Joined: Mar 2007
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7.3 Hard Start
Hello, I have a 2001 7.3 that doesn't like to start after sitting all night. It always starts, sometimes takes twice, but is missing and has no power. It acts like the old pump system when there is air. If left to idle it will be missing then one at a time pick up the dead cylinders. It doesn't seem to increase in idle for cold warm-up.
There is no smoke and the glow plugs act normal. Other times when it is used daily, there is no start issues at all. I have checked the HPOP and it is 1/2-3/4" below the top. I have filled it before trying to start with no avail. It has gotten increasingly worse since its last oil change 1500m ago (Castrol Diesel engine oil 10-40) but was doing it before. Ambient temp doesn't make a lot of difference. Replaced the CPS with no change. What is next? This thing is making me nuts!
Have seen some reference to the Injector Control Module and a CMP?, don't know what that is and don't know if the throttle position sensor/idle position sensor can create any of this. I really like this PU but can't tolerate the hard start issues.
Jailhouse Jim
There is no smoke and the glow plugs act normal. Other times when it is used daily, there is no start issues at all. I have checked the HPOP and it is 1/2-3/4" below the top. I have filled it before trying to start with no avail. It has gotten increasingly worse since its last oil change 1500m ago (Castrol Diesel engine oil 10-40) but was doing it before. Ambient temp doesn't make a lot of difference. Replaced the CPS with no change. What is next? This thing is making me nuts!
Have seen some reference to the Injector Control Module and a CMP?, don't know what that is and don't know if the throttle position sensor/idle position sensor can create any of this. I really like this PU but can't tolerate the hard start issues.
Jailhouse Jim
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Joined: Jan 2004
Posts: 4,758
Likes: 7
From: colorado
castrol does not make a 10-40 diesel oil, double check that. what about the batteries, often there can be enough juice to turn the motor over but not enough to start it. the PCM has to see a certain voltage (i forget how much) to start the truck, if it drops below that it will not start
