Stalling at Idle
Thread Starter
|
New User
Joined: Apr 2007
Posts: 1
Likes: 0
Stalling at Idle
I need help on a problem we are having. I have a 2002 Ford F-350SD 7.3 DRW Crew Cab 4 wheel drive with 222,000 miles that we sold about 6 months ago. Our customer has had repeated, intermittent problems with the truck wanting to die when coming to a stop. It is then hard for him to re-start the vehicle.
There is no consistency in how far he drives it or what the temperature outside is. It has had this problem after driving the truck a couple of miles or all day and then he can drive it for days without having a problem.<O:p></O:p>
<O:p></O:p>
We have replaced the cam position sensor and the low pressure oil pump. When we first got the truck it had a fuel leak so we put it in the shop and they installed a new o-ring kit.<O:p></O:p>
<O:p></O:p>
HARD TO START in the mornings is another problem and I am not sure if it is related. This is also intermittent. No pattern with outside temp. Hard to describe but it acts like it has lost its prime. when cranking engine it acts like it's only firing on a couple of cylinders but if you continue holding the starter it finally hits on all and starts then quickly smoothes out. <O:p></O:p>
There is no consistency in how far he drives it or what the temperature outside is. It has had this problem after driving the truck a couple of miles or all day and then he can drive it for days without having a problem.<O:p></O:p>
<O:p></O:p>
We have replaced the cam position sensor and the low pressure oil pump. When we first got the truck it had a fuel leak so we put it in the shop and they installed a new o-ring kit.<O:p></O:p>
<O:p></O:p>
HARD TO START in the mornings is another problem and I am not sure if it is related. This is also intermittent. No pattern with outside temp. Hard to describe but it acts like it has lost its prime. when cranking engine it acts like it's only firing on a couple of cylinders but if you continue holding the starter it finally hits on all and starts then quickly smoothes out. <O:p></O:p>
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
Could be several issues: fuel related, oil system, or electrical.
First things first, do you have a scanner compatible with the PSD's to read trouble codes? A stored code can many times help you pinpoint exactly what the problem is. If not, you'll have to search a bit for the problem.
Check the wiring harnesses under the valve covers (UVC harnesses). They are prone on some trucks to wear out and ground out the harness, or to come unclipped underneath the valve cover, requiring you to remove the valve cover and hook it back up. If it's loose, it will cause random issues with shutting down or running rough.
Also a bad ICP sensor or harness can cause similar issues. The ICP is located on the driver's side high pressure oil rail, just behind the alternator. Look to see if there is oil leaking from the sensor, if the harness is loose, or if the nut on top has worked it's way off.
Last is the fuel issue. Without an aftermarket gauge, there is no way to really monitor fuel pressure. Best way on the street is when the engine dies, open the drain valve and with the key in the run position, see if fuel is spraying out, or just dribbling. That will tell you quickly if the fuel pump is running healthy enough or not.
First things first, do you have a scanner compatible with the PSD's to read trouble codes? A stored code can many times help you pinpoint exactly what the problem is. If not, you'll have to search a bit for the problem.
Check the wiring harnesses under the valve covers (UVC harnesses). They are prone on some trucks to wear out and ground out the harness, or to come unclipped underneath the valve cover, requiring you to remove the valve cover and hook it back up. If it's loose, it will cause random issues with shutting down or running rough.
Also a bad ICP sensor or harness can cause similar issues. The ICP is located on the driver's side high pressure oil rail, just behind the alternator. Look to see if there is oil leaking from the sensor, if the harness is loose, or if the nut on top has worked it's way off.
Last is the fuel issue. Without an aftermarket gauge, there is no way to really monitor fuel pressure. Best way on the street is when the engine dies, open the drain valve and with the key in the run position, see if fuel is spraying out, or just dribbling. That will tell you quickly if the fuel pump is running healthy enough or not.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Welcome to FTE musialmotors.
I think it sounds more like aoil problem than fuel. First thing in the morning before your mechanic tries to crank it, have him check the oil level in the high pressure reservoir. If the level is good there have him put a hand on the injection pressure regulator. If it works it's way loose it can produce the intermittant symptoms you describe without setting a code.
The injector harness described by Pocket can also cause the same symptoms, as could a failing injector driver module.
Where did the cam sensor come from? If it wasn't from Ford or International it could still be suspect as there has been some discussion of the local parts place units not being up to the task.
I think it sounds more like aoil problem than fuel. First thing in the morning before your mechanic tries to crank it, have him check the oil level in the high pressure reservoir. If the level is good there have him put a hand on the injection pressure regulator. If it works it's way loose it can produce the intermittant symptoms you describe without setting a code.
The injector harness described by Pocket can also cause the same symptoms, as could a failing injector driver module.
Where did the cam sensor come from? If it wasn't from Ford or International it could still be suspect as there has been some discussion of the local parts place units not being up to the task.
