Thanks for the great question.
It is possible that you have a fuel delivery problem. You will need to check the fuel pressure with a gauge and hose long enough to drive and watch what the fuel pressure is doing especially under a load. Let me know what the pressure reading is. Could be a faulty fuel pump. If that is the case, replace fuel pump.
Ok, sounds good.
Ichanged the fuel pump today pressure improved about 4lb. but did fix problem.If u stoXXXXX XXXXXght it is hard to get moving it stumbles and back fire in exaust once u get some speed up it will go on good does this worse when motor get warm.
What engine do you have?
Did you ever have any codes in the computer? What were they?
I back with more info the codes ar po340 camshaft position sensor circuit malfunction the other is p1000 obd II monitor test drive cycle not complete. thvan 58,168 miles on it. I have changed the cam sensor,spark plugs,fuel filter,fuel pump we have 42lb.with key on motor off.35 to 42 motor running. I change maf sensor and crank sensor.no results.Went to ford garage they changed the stator assy.,the synchronizer assy.the ecm module. they removed timing cover and reset timing. inspected the wiring harness all of this with no results. when you stop and try to accelerate it bucks sputters after you get some rpms up it runs good at high rpms. It seems to be a little beter when cold.Checked wire plugs and cleaned them no results.If you have a suggestion le me know thanks for your help. J N
Wow, I'm not sure what you have going on there. I will opt out and let another tech read this, and maybe they have run into something like this.
Hello and Welcome to Justanswer,My name is XXXXX XXXXX I am here to try and assist your with your question
Does the van or engine make a squealing nosies like a loose belt when it acts up?
Incorrectly installed gear driven camshaft position (CMP) sensor synchronizer assemblies may be hard to diagnose. Vehicle may exhibit poor fuel economy, driveability Diagnostic Trouble Codes (DTCs) P1336, P1309, P0340 with MIL light on. Loss of power, surge, hesitation and runs rough on acceleration may also be present.
New diagnostics have been developed for WDS to diagnose incorrectly installed gear driven camshaft position (CMP) synchronizer assemblies. Refer to the following Service Procedure to diagnose a possible mis-installed synchronizer assembly and proper installation procedure.
CMP sensors are used on all current model year engines, regardless of fuel system or ignition system type. The CMP sensor provides the Powertrain Control Module (PCM) with cam position information to indicate # XXXXX cylinder, on the compression stroke
There are two different types of CMP sensors:
Although the Hall-effect (three-pin) and the Variable Reluctance (two-pin) CMP sensors perform the same function, their signal appearance is quite different and they are not interchangeable.
Both sensors provide a switching voltage as the engine rotates.
If you suspect that a vehicle (engine) may have had the synchronizer assembly (Figure 3) installed incorrectly, check the vehicle history to see if related service has been performed. If you determine that the synchronizer could have been installed incorrectly, use the following procedure with WDS to verify correct installation (Figure 5).
Reasons for incorrect installation are:
The WDS Power Balance Test can be used to quickly determine if the CMP synchronizer assembly is installed incorrectly. Use the following procedure.
On all Hall-effect sensors, the CMP wave form rising edge should occur between the 7th and the 10th peak past the missing tooth. (Figure 6)
On the VRS sensors (except 5.0L engines), the falling edge of the CMP waveform should cross the zero reference line between the 7th and 10th peak past the missing tooth waveform. (Figure 7).
On 5.0L engines with a VRS CMP sensor, the falling edge waveform should cross the zero reference line between the 6th and the 9th peak past the CKP missing tooth (Figure 8).
On 5.0L engines with a Hall-effect VRS CMP sensor, the rising edge of the wave form should occur between the 6th and 9th peak past the CKP missing tooth wave form.
If your fuel pressure is 42 lbs under a load and 32 at idle then fuel pressure is ok.
If you are throwing a code p0340 and it is acting up then it is a cam sensor or drive or alignment issue.
You have replaced the synchronizer right?
You used a lab scope and adjusted the cam sensor to the crank sensor correct?
Wave pattern should look like this with lab scope
I LET THE FORD GARAGE DO THE LAST CAM SENSOR I DONT KNOW WHAT USED .I DONT HAVE A LAB SCOPE BUT I AM SURE IT IS NOT A .TIMING PROBLEM WE ARE CHANGING THE COIL PACK I WILL LET U KNOW HOW IT COMES OUT THANKS FOR YOUR HELP. WE WILL HAVE A NEW FORD AFTER A WHILE HA.JN
sometime tough to diag over the Internet without hands on and test equipment
Glad you fixed it