NEED HELP. Fuel Rail too hot? WK 3.7
I have a 2005 WK 3.7. For many years I have read this forum for information, but I am currently stumped on something, so I figured I would post. Thanks for all the help in the past.
If the engine is warm, and you shut the vehicle off and restart it within a couple minutes it will run fine.
But if you let the jeep sit for some time with the engine off and the heat from the engine keeps heating the engine compartment, then you try to start it and it will not start, it cranks, it will not start, it sounds very very rough, like it has skipped timing, but it hasnt.
Now if you let it sit for a couple hours so the engine compartment heats up from sitting there, then has time to cool off to ambient temperature again, it will start with no problem.
This problem has plagued me for over a year now. I have pulled codes all the time, I have it set up through a blue tooth adapter and can pull codes and real time info on my android phone.
Thought it could have been a camshaft position sensor or crank sensor, so for $12 each, I replaced them, nothing better over time.
The only conclusion I have come to, is that the heat created in the engine compartment while sitting off with no fan running, is heating the fuel in the fuel rail and causing it to not start with hot fuel.
If it wont start, I pop the hood, put a paper towel or rag over the schrader valve on the fuel rail, and release the hot fuel from the rail, and you can feel that the fuel is extremely hot. Then i go to start it again, and it starts with no issue, other than a lean code, I assume the code is because of the rough start and it wasnt getting fuel.
Has anyone heard of such a thing before? It has taken me some time to narrow this down, but this is the fix for when it wont start when the engine compartment is hot.
I have a wireless thermometer in the engine compartment, and it will be 70 degrees in there while I am driving around, then I park it, and turn it off, and I have seen it climb to 135 degrees, and it will not start.
Last edited by DavidsCyclops; 10-16-2012 at 03:03 PM.