I have an 02 and its doing nothing I have seen here on other threads. Here we go.

Just bought it. Previous owner took the chip off and did the seals on injectors. Good clean truck so got get issue fixed.

First start goes to high idle warm no problem. Starts great.

Warmed up pull out of driveway starts surging. Just in gear and out. Jumping from high idel to low.

Driving. If you drive it like grandpa no problems, but put to the floor and don't lift it spudders and misses. Never stalls or dies, but come to a stop goes back to weird idle again.

Change icp and ipr already, and have boost fooler on. Everything is normal, and scan guage2 is testing norm.

Any suggestions?
Please help

 

There are literally several things that can cause such a complaint.

First, let's rule out the most obvious, Fuel Pressure.

Fuel Pressure Testing:

Tools: Fuel Port Adaptor (M12 1.5) and Pressure Gauge 0-160 PSIG / DVOM

**The Mixing Chamber Screen should be checked. Which, can be a pain. Someone, somewhere, "missed the boat" on this design. There is no "magic" formula to identify this type of obstruction. Forcing Fuel using Air to dislodge the contaminates can often identify the issue. **

** Fuel Bowl Test Port Spec. 45 psig min See 8c. below

8b. Right Head:

a. Fuel Pressure at the right head Verify that fuel is in the tank and the pump is being powered.

b. Measure fuel pressure at the front of right cylinder head Road Test- engine at full load condition Spec. Measurement / Head 0-160 PSI / WOT 45 PSIG min.

c. If fuel pressure fails low, go to step 8c.

*If pressure is above min. spec, go to step 8b. and repeat procedure on Left Head (Left Rear). If fuel pressure fails low, go to step 8c.

d. Fuel Pressure at the left head Measure fuel pressure at the front of right cylinder head Road Test- engine at full load condition Spec.
Measurement / Head 0-160 PSI / WOT #42 PSIG min. (45 because you can't find #42 on any gauge I got). Another line on the FoMoCo Manual that should have been proof read.

CAUTION: Secure hose away from turbo and exhaust if fuel pressure is below min. spec, replace left check valve if fuel pressure is above
Min. spec, * Go to step 9.

8c. Electric Fuel Pump

a. Measure Fuel at Fuel Bowl Test Port using Fuel Port Adaptor (M12 1.5) and Pressure Gauge 0-160 PSIG / DVOM Spec: 45 psig WOT (>42 psig)

b. Measure at fuel outlet from electric fuel pump: Engines built since 1/1/98 or engine serial #661496 should be 51 ± 4.5 PSI @ idle.

c. Road Test- engine at full load condition 42 PSIG MINIMUM*

d. If fuel pressure fails low, go to step 8d.

e. If pressure is above min. spec, replace right check valve.

8d. Electric Fuel Pump Inlet Restriction

a. If fuel line is restricted above 6 Hg, check for: blockage between pump and fuel tank.

b. If fuel line is not restricted, inspect regulator valve condition and for debris, If OK replace pump.

*Testing Procedures on all 7.3 DIT 1999.5-2003 F-250-F-550 Models*






Next, you'll need to acquire some data for further evaluation using a Scantool:

SERSOR PID MONITORING:

TOOLS REQUIRED: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scantool), or Android OS Software with Torque-Pro (or other capable software) with Bluetooth OBD-II Connectivity or, Scan Gauge II - X-Gauge, or similar device.

1. Select the parameters indicated from the Scan Tool parameter list and monitor while cranking engine:

1a. Remove the 30Amp Fuse controlling the IDM, FIWS, and FBH so the Engine does not start during cranking.

1b. The maximum necessary cranking tome is 10 - 15 Sec.

1c Record the values (#2a - #2g) listed in "Data List Monitoring Parameter:"

2. Data List Monitoring Parameter:

2a. Vehicle Power (V-PWR) 10.5 VDC Minimum.

2b. RPM 100 - 150 RPM Minimum (0 - CMP Suspect)

2c. Injector Control Pressure (ICP) 500 PSI or 3.4 MPAM Minimum

2d. Injector Control Pressure Voltage (ICPv) Key On Engine Off (KOEO) Spec: 0.20v - 0.30v

2e. Injector Control Pressure Duty Cycle (ICP %) Spec: 10%-12% at idle, engine at 140F or > / NTE 20% while Cranking / 65% is closed (IPR Suspect)

2f. ICP - A minimum of 500 PSI (3.4 mPa) is required before the injectors are enabled. No or low oil in the reservoir, system leakage, injector O-Rings, or faulty IPR could cause pressure loss. You can disconnect it from the wiring harness. The PCM is programed to use a Delta of 700 psig. Driving the vehicle while disconnected is not recommended.

Note: If no RPM signal is received, IPR duty cycle will default to 14%

2g. FUEL PW - Even though a 1 to 6 mS FUEL PW is shown, it’s possible the IDM did not receive the signal due to a CI or FDCS circuit fault or internal IDM failure.

2f. Fuel-Pulse-With (FPW): 1 MS - 6 MS (<1 / >6 IDM Suspect)

2g. *V-PWR - If indicating a low voltage condition, check battery voltage, charging system or power and ground circuits to the PCM.

3. The Following Parameters may be required for identifying loss of power, No Start Hot, Rough Idle, and many more such customers’ complaints. These values should be recorded for comparison and future use in identifying anomalies:

Because the PCM adjusts injector output based on oil temperature information received from the Engine Oil Temperature sensor and turbo boost information received from the Manifold Absolute Pressure (MAP) Sensor, and the Barometric pressure (BARO) sensor. These corrections are necessary to meet emissions requirements and to optimize power.

Outputs of these sensors are displayed EOT (temperature), MAP (boost pressure), BARO (pressure), and BARO V (volts). MGP shows boost.

** PID / Name / Measurement **

3a. EXBP 10-15psig w/ EBPV closed and not exceed 45psi at WOT Note: EXBP showing low (3-5psi) that barley rises with acceleration indicates bad sensor or plugged tube. Exhaust Back Pressure (PSI).

3b. MAP: Frequency output; 111Hz / 14.7 psi, 130Hz / 20psi, 167Hz / 30psi.

3c. BARO: 5 volts in, @4.6 volts/14.7 psi at sea level, decreasing as altitude increases. (Volts)/100 kPa (14.5 psi).

3d. EBP: 5.0 volts in, 0.8-1.0 volts/14.7 (PSI)

3e. IAT: 5 volts in, 3.897volts@32°F, 3.09@68°F, 1.72@122°F

3f. MAP: Manifold Absolute Pressure (ATM)

3g. MFDES: Mass Fuel Desired (mg)

3h. MFREQ: Mass Fuel Required (mg)

3i. VFDES: Volume Fuel Desired (Cubic mm)

Hope this helps some!

 

Dude Tom thank for quick reply. And tons of info.

I have a brand new fuel pump and filter sitting waiting to go in. Just because I thought the one on there now is making weird noises. But I am going to check and the stuff above like you said.

This why I love this site!


With my issues I was thinking more to the pcm and idm. Only thing left bedside hpop and ripping out injectors.

Thanks Dan

 

Those this site have stickies? if so this would be a good one. Just one thing, when you nail it and it shutters have you noticed the condition of the exhaust? Is there lots of black smoke? The reason I am asking is that my 94 had a similar problem and it turned out to be a clogged air intake. Plastic bag found a home in my air intake before the air filter, when I opened the hood the air intake between the filter and turbo was sucked in.

 

Clean out the trail pipe, sorry. And there is an aem intake on mine and its clear

 

Might want to check all your intercooler/turbo boots for leaks too....whats your boost guage look like if you have one...are you getting good boost?? Have you checked the turbo wheel to see if it has any play in it??

 

Getting boost. High teens

 

Welp.....thats not it, disregard

 

I did see on Powerstrokehelp where the inj. electrical connection at the valve cover will back off and cause a bad miss. The bad thing is you need to remove the valve cover to check, unless somebody knows how to check with a meter, if it is loose than you should get intermittent readings.

 

Have you disconnected the batteries and let it sit for 10 minutes to make sure the PCM will default to factory specs.


Only reason I ask is when you said the PO removed the chip.


Denny

 

Nope haven't tried the battery trick. But I will tomorrow when I thrown my new filter and pump on.

The only reason I dont think its an injector is because when cold it will run perfect. And 1/4 throttle no problems.

So I am leaning more towards a fuel issue or tps on the pedal. Is there something can ivs?

Thanks dan

 

So little up date. Today

Put new filter

Pump fuel

Cam position sensor

Definitely help my miss at high rpm!

But I am still having idle issues. While driving around it idles@800_840 in gear. Automatic

I am assuming that's high idle. Its sounds like the engine wants to go to low idel think it's 650 or something so it skips from high not making all the way to low. In other words it spudders, and not settling to solid idle.

It is running better good reading on ebp, icp, ipr, and boost. Even the hpr reading was saying 260 hp on truck. It only had intake and exhaust.

Any help much appreciated.!!!

Thanks Dan

 

Could a bad fuel return cause this? Like if its plugged some where?

I dont thing its hpop related because of 2700 to 3000 psi on icp snesor

And now with fuel supply fixed (I hope) it pulls better. So I don't feel its and injector issue

 

Did you happen to put an IH CPS or Motorcraft one? Because this happen to me, where the truck would not idle right it went fom 750 to 650 i went to a local ford dealer (it had warranty) replaced it no more problems. And if you put one of those auto store ones they are no good.

 

I got the purple or blue one from pure diesel. Said it was IH that they should jave to put to beging with. No change from idle jumps from the one I took out and the new one.