Hi....I have a 2000 7.3 with 70,000 miles. This truck sits in a garage most of the time, but just lately it has developed a "long crank 5 to 6 seconds" before it fires then's run just fine.

What I have noticed is, when I shut the truck off for more than 15 to 20 seconds, I get a long crank 5 to 6 seconds then it fires....If I shut the truck off and restart it WITHIN 1 to 10 seconds it will fire Immediately "just like it has always started in the past" it's only if it sits for more than about 15 to 20 seconds do I get a long crank. I find engine temp or air temp as nothing to do with it, it acts this way regardless if it's the first start in the morning OR after the truck has been running all day......Does this sound like a possible IPR valve leaking down ?

Thanks in advanced

 

Could be IPR or maybe injector O rings

 

Well..with your experience, do you feel that O-rings could leak down that fast and still have the engine run so good after starting ?...And am I correct in thinking that if the IPR valve is leaking down, it would create low oil in the HPOP reserve tank and the sensor on that tank telling the engine not to start till there is enough oil in it to start therefore the long crank...or am I way off in my thinking ?..................There are NO other issues with this engine after it starts what so ever.

 

The sensor in the reservoir is for oil pressure, it has nothing to do with the engine starting. If the O rings are cracked bad enough it could leak down that fast

 

Thanks...However, what are your thoughts about the IPR valve creating this problem, I ask because that would be the easier repair, then go onto the injector O-rings.

 

Its worth a shot