1999 Ford F-150 code 300 and slight hesitation on take off a

Tiny
THE FIXER
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
I have a customer with a 1999 F-150, 5.4l auto with a slight hesitation always, cold or hot. I can re-set the codes but still hesitates all the time and sooner or later code 300 comes back, multiple engine miss or radom engine miss. I have tuned it, a lot of new coils, air filter, fuel filter, pcv valve, replaced 1-injector due to leak ( new inj.), Problem seem to come about after that injector was replaced.
Thank you for any help you may have.
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Thursday, April 1st, 2010 AT 2:38 PM

5 Replies

Tiny
MERLIN2021
  • EXPERT
Check the PCV rubber elbow, they dry rot and leak, real common problem. You might want to do a compression check while you are at it.
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Thursday, April 1st, 2010 AT 3:07 PM
Tiny
THE FIXER
  • MEMBER
On your reply you suggest a compression test and check the PCV insert hose and tubing, I did all of that, comprssion is great, no vacuum trouble from the PCV and has new PCV valve and hoses. Have looked at every vacuum line and comtrol unit for vacuum. It has a very moderate hesitation on take off or anytime there after on first acclearation. It does not miss and runs great on highway speeds.
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Saturday, April 3rd, 2010 AT 3:07 PM
Tiny
MERLIN2021
  • EXPERT
Have you checked the crank sensor? Let me know ALL thing you have done to improve the problem please. It could save us some time!
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Saturday, April 3rd, 2010 AT 10:31 PM
Tiny
THE FIXER
  • MEMBER
I have checked the crank sensor, ohms and volts very good. I have ohmed all coils, new plugs, fuel air, PCV valve, hoses, TBS, Idle-air, cleaned injection system, TBI sustem. Replaced some questanable plug ends at the coils. Can you tell me the fuel pressure it should have, from what I have found, it's normal.
Thanks,
Fixer.
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Sunday, April 4th, 2010 AT 3:08 PM
Tiny
MERLIN2021
  • EXPERT
There is aslo a TSB on 5.4 for non commanded EGR flow, test like this: 5.4L 2V - INTERMITTENT ROUGH IDLE - NON-COMMANDED EGR FLOW TECHNICAL SERVICE BULLETIN Reference Number(s): 05-4-17, Date of Issue: March 7, 2005 Related Ref Number(s): 05-4-17 ARTICLE BEGINNING DESCRIPTION INTERMITTENT ROUGH IDLE - NON-COMMANDED EGR FLOW ISSUE Some 1997-2005 5.4L 2V vehicles may exhibit an intermittent rough idle. This may be due to non- commanded EGR flow. ACTION EGR flow can be detected by comparing the stabilized DPFEGR KOER voltage (from NGS/WDS) at idle after manually opening and closing the EGR valve through 8 cycles. Record the DPFEGR voltage after each cycle. If the DPFEGR voltage increases by 0.03V or more from the stabilized idle voltage and is associated with a rough idle, the valve should be replaced. Refer to the following Service Procedure. SERVICE PROCEDURE 1. Connect NGS/WDS and monitor DPFEGR PID. 2. Record initial stabilized DPFEGR voltage. 3. Disconnect the EGR valve vacuum line and connect hand held vacuum pump. 4. Raise RPM to prevent stalling and fully open the EGR valve. 5. Fully close valve and return to idle. 6. Record stabilized DPFEGR voltage. 7. Repeat Steps 4-6, eight (8) times. 8. If voltage increases by 0.03V or more with an associated rough idle condition during any of the cycles, the EGR valve may be sticking. Lightly tap the EGR valve casting and observe if voltage returns to initial DPFEGR value. a. If the DPFEGR voltage returns to the initial value and the associated rough idle is gone replace the EGR valve. b. If there is no change in DPFEGR voltage do not replace the EGR valve and perform normal diagnostics. FORD: 1997-1999 F-250 LD; 1997-2004 F-150; 1997-2005 E-Series; 1998-2004 Expedition; 1999-2004 F-Super Duty; 2000-2005 Excursion LINCOLN: 1998-1999 Navigator
9. If the EGR valve is replaced repeat Steps 3-6, two (2) times to verify fix. PARTS INFORMATION PARTS INFORMATION WARRANTY INFORMATION Part Number Part Name XL3Z-9D475-CA EGR Valve 4/5/2010 ... Fuel system:
1. Release fuel pressure. Install fuel pressure gauge. Turn ignition on and read fuel pressure. Compare fuel pressure reading on fuel pressure gauge with specifications in FUEL PRESSURE SPECIFICATIONS . 2. If fuel pressure is not within specifications, check fuel pressure regulator. With engine running, connect hand vacuum pump and apply vacuum to regulator. 3. Ensure fuel pressure changes as vacuum at regulator is increased and decreased. If no pressure change occurs, replace regulator and recheck system. For additional testing information, go to TEST HC in SELF-DIAGNOSTICS - EEC-V or SELF-DIAGNOSTICS - VILLAGER article. FUEL INJECTORS Fuel Injector Resistance Disconnect injector harness connectors. Using digital ohmmeter, measure resistance between injector terminals. See INDIVIDUAL INJECTOR RESISTANCE table. Replace any injector not within specification. Fuel Injector Check (Gasoline) Start engine and allow to idle. If engine will not start, crank engine for 10 seconds. Using a stethoscope, listen for clicking sound at each injector. If clicking sound is heard, fuel injector is operating. If clicking sound is not heard, proceed as follows: For all EEC-V models, go to step 8) of TEST HD in SELF-DIAGNOSTICS-EEC-V article. For Villager, go to step 4) of TEST HD in SELF-DIAGNOSTICS-VILLAGER article. NOTE: For additional testing and information, see SYSTEM & COMPONENT TESTING - EEC-V article. Page 1 of 1 4/5/2010 ...


http://www.2carpros.com/forum/automotive_pictures/62217_Fuel_Pressure_2.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_Injector_resistance_1.jpg

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Monday, April 5th, 2010 AT 3:24 PM

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