Question about Ford F-150

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5.4 engine checks out for plugs and coils but stumbles badly under pull. 2004 F-150, 5.4, 4x4 with auto trans

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  • kerr778 Oct 14, 2010

    I have tried the fuel system cleaners but have not helped. Is there a possiblity of a timing problem or a cam sensor problem

  • kerr778 Oct 19, 2010

    sorry it took so long to get back to you. There are no fault (check engine light) on, but I think you have me going in the right direction. THANKS ALOT

  • kerr778 Oct 27, 2010

    I think you are on the right trail but, The EGR valve I purchased does not look like anything on top of the engine. I think the EGR valve is on top of the manifold and to the rear. Is there a chance this engine has a different system.

  • kerr778 Oct 28, 2010

    I still have not found the problem. I does not have a standard EGR valve.

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  • Ford Master
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EGR insufficient flow is usually a DPFE sensor. Or EGR sensor if you go to NAPA.

Look at the hoses to see if they are ripped and if the sensor is broken, thats most likely your problem; also, remember that get only ford sensor and hoses if necessary.

If you post the fault numbers (DTC's) , you'll get more feedback. When to TB/Plenum hasn't been takin care of (Cleaned) there can be repercussions. The EGR poppet valve is most likley hanging - Hence excessive Flow = 402

Stuck Open Test:
Whenever at idle, the PCM checks the voltage of the DPFE sensor and compares it with the voltage recorded by the PCM during the last Key On Engine Off state.

If the voltage is different this indicates a gas flow where none should exist, and the PCM stores the DTC P0402 EGR Flow Excessive Gas Detected. This can cause confusion: in this context excessive flow means there is a flow where none should be detected, ie, the EGR poppet valve has stuck open.

Here's a better look at the valve. Note: The actuating rod is all called the poppet valve.

5.4 engine checks out for - 36f2e70.gif

So, your valve hanging enough to cause problems is my guess. This weakens the mixture sufficiently enough to cause misfiring, and manifests itself as a noticeable misfire/hesitation at speed and light throttle, not present when accelerating.

Keep us updated.

Posted on Oct 14, 2010

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  • Ford Master
  • 11,800 Answers

If the engine doesn't deliver full power and the sparks are good then the only thing left is the fuel delivery: check the fuel filter and the injectors. It's necessary to run a cleaning additive with a tank of fuel for best results.

Posted on Oct 14, 2010

  • Azrael SRL Oct 14, 2010

    If it would have been one of them hen heir failure would have been detected by the ECM and the check engine light would have been lit.
    Unless of course the sensor is still operational but no longer attached to the engine. Just by looking you can see the situation.

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1 Answer

Engine stumble


You were right in checking the fuel pressure. And yes the distributor shaft could be worn enough to be affecting the signal to the coil.
The coil could be weak too.
You would need to try to figure out if it is a spark or fuel problem to proceed. The throttle position sensor could be wearing out. But if a sensor fails it should turn the check engine light on.

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Error code P0300


A P0300 diagnostic code indicates a random or multiple misfire
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back
Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

A code P0300 may mean that one or more of the following has happened:

  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders ( spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open

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1 Answer

Okay, have a 2000 ford taurus, took it to auto zone and the code he got is P0302,,


P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2. SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes

A code P0302 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

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1 Answer

98 Sebring 2.5 runs fine when engine is cold, starts to bog down when hot stumbles and can't get out of it's own way. When u floor it after the stumble it goes like it should slow down and starts to...


I am having the same problems with mine,, new EGR valve, new plugs wires, cap and rotor along with coils all tested good.

i still have my check engine light flashing on and off and the only codes the car pulls is misfire in #1 cylinder, nothing seems to fix this??? what going on?

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2 Answers

The code reads P 306 misfire on cylinder 6. How


A P0306 code means that the car's computer
has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes

A code P0306 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

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2003 Lincoln Navigator stumbles/bucking under mild acceleration


I have a 2003 Nav with the exact same problem. I've found it diminishes when taken out of overdrive. Also it's intermittent but more towards bucking. Sorry to post this under solutions.

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Ford 2000 F150 engine stumble


A common problem with fords with a coil on plug set up is that the coils go bad. If there is no check engine light on. With the car running unplug one fuel injector at a time and see if the engine stumbles harder. If it does then that coil is good. If you notice no change then that coil is bad. Most of the time to 2 in the back on both side go bad. I would try those first. Let us know how it goes.

Jul 31, 2009 | 2000 Ford F150 Flareside SuperCab

4 Answers

Missing and stumbling during acceleration


4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.

Feb 07, 2009 | 2000 Ford F150 Flareside SuperCab

1 Answer

DAEWOO LEGANZA P0303


A P0303 code means that the the car's computer
has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.
Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors
.


Jan 23, 2009 | 2002 Daewoo Leganza

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