99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
I've got a 2000 7.3 f-250 4X4 with 184,000 miles on it with no mods. It's never had anything done to it.
It surges from idle or when your first taking off. It's really not a surge it's like the turbo boost is going in and out or it's not getting enough fuel and it's getting worse. I had a fun time driveing up the driveway last night, thought it was going to quit.
I have also noticed lately that the engine has a loud hissing noise when I start it up. It's never really had a lot of power, always fwelt like I have to push it to go.
But when you accelerate at a good clip it evens out or if I am pulling it dosen't do it at all, infact it really does a great job when somethings behind it.
Chilton says check these causes:
1.Vacuum leak at the intake manifold or vacuum hoses.
2.Restricted air filter
3.Fuel pump or pressure regulator defective.
4.Fuel injection or engine control systems malfunction.
When we put it on a diagnostic tester no codes came up?
Well, if Chilton really wants you to check vacuum leaks on a diesel.....
Fuel pressure is possible. A bad ICP sensor or sticking IPR. Check the IPR solenoid tin nut to make sure its tight. Examine the ICP harness for oil penetration. Checking the air filter is never a bad idea. Checking for vacuum leaks in the intake is...
I thoroughly believe we should ALL have fuel pressure gauges on our trucks. Its too important and too often overlooked.
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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
"IF YOU CAN'T FIX IT WITH A HAMMER, YOU’VE GOT AN ELECTRICAL PROBLEM"
It surges from idle or when your first taking off. It's really not a surge it's like the turbo boost is going in and out or it's not getting enough fuel and it's getting worse. I had a fun time driveing up the driveway last night, thought it was going to quit.
I have also noticed lately that the engine has a loud hissing noise when I start it up. It's never really had a lot of power, always fwelt like I have to push it to go.
But when you accelerate at a good clip it evens out or if I am pulling it dosen't do it at all, infact it really does a great job when somethings behind it.
Welcome to TheDieselStop, Frank
What RT said about Chiltons - Pretty much worthless, even if they knew about diesels. Also a generic scan tool won't pick up most codes from a 7.3L. You have to use a higher end scan tool.
You probably have an issue with your Exhaust Backpressure System. It's there to partially close off the exhaust to warm up a cold engine quicker, but when it has a problem, it'll cause the symtoms you're describing.
The hissing is normal on a cold start (below 40F ambient and with oil temp below 140F). The EBP system also disables when you mash the go pedal.
The surging is probably the valve "hunting" for the proper position with screwy inputs, or a problem with the solenoid that controls the oil flow to the valve actuator. Could be caused by a plugged EBP sensor tube or a bad EBP sensor.
As a test, you can disconnect the intake air temperature sensor wiring (back side of the air cleaner box) and the system will be disabled. If you do that and it evens out, that pretty much confirms a problem with the EBP system. You'll get a check engine light and code with the IAT sensor disconnected.
Pull off the EBP sensor and tube and clean them with some carb cleaner and/or a wire (weed wacker string has been used), but don't stick the wire into the sensor, because you may damage it. Also clean out the fitting where the tube screws into the front of the passenger side exhaust manifold.
Here's a couple of photos to point you in the right direction.
If that doesn't fix it, you may have a sticky solenoid (mounted into the front of the turbo pedestal).
Question for y'all
I am having similar problems with my 2001 7.3L. Surging and cutting out while not having a lot of power. I removed the EBP sensor and tube, took an air compressor and cleaned the tube out. Nothing was clogged but, was dirty.
This didn't make any difference in performance, still surging and cutting out. I disconnected the IAT to test the system, I didnt get a SES light on the dash and nothing changed. Any ideas for me?
BTW Ive recently replaced the ICP solenoid and the CSP sensor.
Thanks
Question for y'all
I am having similar problems with my 2001 7.3L. Surging and cutting out while not having a lot of power. I removed the EBP sensor and tube, took an air compressor and cleaned the tube out. Nothing was clogged but, was dirty.
This didn't make any difference in performance, still surging and cutting out. I disconnected the IAT to test the system, I didnt get a SES light on the dash and nothing changed. Any ideas for me?
BTW Ive recently replaced the ICP solenoid and the CSP sensor.
Thanks
Your cutting out issue won't have anything to do with the EBP system. The only thing that will do is make the engine feel like it's bogging down.
Are you getting an SES light at any time? Cutting out could be an injector harness issue. The UVCH connectors tend to come unclipped and cause open circuits to the injectors. With vibration, heat, etc. it can easily be intermittent.
Let me explain, best I can a little further. I think I might have two issues going on.
First being the possibility of a faulty accelerator position sensor. Right around 45mph at 1500rpm on flat ground, truck starts to cut out and hesitate (missing).
Second issue is more of a sound, and not a sound it will always make. It almost sounds like someone covering the intake to a leaf blower. If I release my foot from the pedal and then press down again truck comes alive and all is well till next time. Almost like something blocking the exhaust.
I have already replaced the UVC gaskets.
I had access to a scanner and was able to do a buzz test on the injectors too.
Im trying not to think it might be injector O rings
Mine did that ended up being the throttle pedal assembly. it was a pain in butt when slick out and in 2 wheel drive. did it all the time pulling away from a stoplight, but ran great otherwise.
Im trying not to think it might be injector O rings
I wouldn't worry about it being injector o-rings. That would cause completely different symptoms like hard starting when hot.
The Accelerator pedal is a distinct possibility.
When it's cold out, the EBP system can cause the sound you might be hearing. It isn't really disabled till the oil temperature is up to temp (over 140F, IIRC). My EBP stays active for about 6-7 highway miles in the morning. I can tell as soon as the EBP system goes inactive, because the sound changes, the boost gauge pops up 3-4 psi, and EGT drops from about 900 to 600 F.
If you have access to the scanner, check it for codes, and set it up to monitoring the accelerator position sensor. As you press the pedal to the floor, the value should rise smoothly. If it jumps or drops off, then something is wrong with it.
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