Mechanics

98 1500 5.9 EXTENDED CRANKING TIME ISSUE

Dodge Ram

Hello to all. The truck has 60,000 miles. The problem is that it developed a prolonged cranking time issue about two years ago when the engine is warm. It starts every time, but it would crank for up to 15 seconds before it would start. When cold, it would fire right up. About a year ago, it reversed itself. Now when cold, it takes 5 to 10 seconds to start. When warm, it starts immediately. It has a new battery and cranks strong all the time. I can hear the fuel pump firing up when the key is turned to on position. Any ideas? If you need more info, let me know. Plugs, wires, serpentine belt changed at 50,000 miles. It does have a very slight, noticed only in the tach, drop in RPM at idle. And it pings like an SOB under load. Dealer says it is supposed to do that. Even gave me a print out stating this. I don't know if this helps, but I wanted to give as much info as possible.
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98rammer
May 29, 2007.



Has a fuel pressure test ever been done on the truck? If the pump is a little weak, then it might not be able to keep up causing a lean condition, and possibly pinging. If it is weak it would also explain the excessive cold cranking

Tiny
Jack42
May 29, 2007.
A very questionable garage tested it and, while they didn't tell me what the pressure was, they said number 8 injector and the fuel line are " bleeding down.&Quot; And they wanted $600 to take care of it. My thought was even if it is bleeding down, wouldn't the fuel pump prime it back up? Also, if it is bleeding into the engine giving a flooded condition, why would it change from cold to hot? I have since found an excellent garage and I can take it there if that is what you are thinking. Thanks.

Tiny
98rammer
May 30, 2007.
When the pump tries tp reprime, there is air that must be forced out through the injectors, the system is sealed so it takes a couple times of the injectors hitting for the air to get out. Hot to cold, the PCm uses different parameters to start in differnet conditions, cold requires more fuel, hot less fuel. If the system is bleeding down it will be difficult to fix other problems, especially if an injector is questionable

Tiny
Jack42
May 30, 2007.
So, if I understand you right, first try the injector. If that doesn't help completely, go after the fuel pump. I appreciate all of your help with this.

Tiny
98rammer
May 30, 2007.
Yes, that way if the injector is gas washing the cylinder, further wear could be prevented

Tiny
Jack42
May 30, 2007.
Thank you very much! I will get back to you for an update.

Tiny
98rammer
May 30, 2007.