dongil
Pa
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I went thru the change the filter/fuel pump scenario a year ago and even though I believe the pump was bad several months later had the same condition develop that you describe and finally installed a new ignition module (myself). Part from Ford under $100. Located on the firewall below the brake fluid reservoir. Ford guy told me the fluid in the module gets hot, bubbles and send info. to computer to cut back engine.
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Big Katuna
Deland, FL
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Joined: 12/27/2003
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When the fuel pump is replaced, there is a new harneess/adapter that has to be wired in. Has that been verified and checked?
My Kharma ran over my Dogma.
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Impetuous
USA
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Joined: 12/18/2002
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It sounds like a problem that I had years ago on a Ford when I was working at a Ford dealer in California The symtoms were just as you describe, but never consistant enough to diagnose. It took two weeks and many part replacements before I drove it without the muffler. No more problem so just installed a new muffler. I cut the old one open and found a baffle had broke loose and at times would block the exhaust. When the engine was stopped the baffle would fall down and not block the exhaust.
2003 Beaver Monterey 40
Cummins 350 ISC
2005 Saturn Vue
Blue Ox
Brake Buddy
King Dome IN Motion
DVR
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Argosy24
MI
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Joined: 05/09/2003
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Is this repeatable? If so go to a shop that will hook a good code reader up and go for a ride. The reader will show in real time what the sensors are feeding to the ECM, injector pulses, etc. and can record for playback on a computer. If it is an electronic problem there is a real good chance it will show up.
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The_Vintagers
Georgia USA
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Hikerdogs wrote:I was looking through my 1999 Ford manual under "Driveability Problems" when I came across this note:
"NOTE:
For applications with linear knock sensor, a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing will be retarded and a lack of power may result."
While I doubt you're driving around with a breakout box attached to the PCM it did suggest your problem might be caused by the electronics rather than fuel.
It's been so long since I've worked on a 460 I don't even remember if they have a knock sensor. Regardless the note mentions that a "loss of power" could be due to the PCM retarding the timing. It could be from sensor errors, bad PCM, or interference from improperly shielded wiring harnesses.
At least it's another direction to look, and yours is obviously not the first Ford product to suffer from a lack of power drivability problem.
hmmmm, is THIS the reason a Ford dealer wrapped one of my harnesses in foil during a service visit? They told me that was a factory recommended modification on our 97 Taurus, and other mechanics have kept it in place.
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calfman47
norman okla
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Do you ever get a check engine light? air flow is monitored by the MAP sencer and the computer disides how much fuel the engine needs depending on the air flow to the motor.
The O2 anlizer which looks like a spark plug is on or near the catlic converter,this tells the motor how much oxygen is not burned in the exhaust gases they work as a team, but not very good if one gets lazy or ouits. The motor will run alright but can go into a LIMP IN mode and throttle responce will be almost be nill or just no power at all.
dan gunter
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LRGTENT
California
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Ignition module? Muffler? Air Flow?
These are suggestions I was hoping to receive! Thanks! Now maybe I can point those "factory-trained" techs in a new direction if they try to tell me the pump is bad, again.
Occasionally we do get a check engine light, but it clears during the on/off cycle. The only code ever pulled was low fuel pressure during pump #3. I've asked them to check for stored codes and was told the 96 was ODB I and doesn't store previous fault codes? Fuel pump wiring harness was replaced with new 4-wire unit twice.
I was also unaware of the "limp in" mode. That seems to completely describe our problem. After 5 fuel pumps, don't you think one of the shops would have explained that to us? Amazing how it's all about the dollar . . .
Anyone ever had any luck with Ford MH division refunding previous repair work?
1996 Bounder F53
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dongil
Pa
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Anyone ever had any luck with Ford MH division refunding previous repair work? NO!
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dongil
Pa
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BTW If you do the ignition module replacement be sure to disconnect the battery first. (Good time to clean the posts). Put some dielectric (sp) liquid on the back of the new module before installing it (helps to keep it from picking up heat from the firewall. And when you remove the module there are 2 spacers (one on each screw) be careful not to lose them (also the screws-they don't give you new ones). After installing the new one and the battery terminals turn your key on and off 3 times (not to start position) to reset computer.
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BobR
Aurora, Illinois
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Joined: 12/07/2001
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My 1991 has a fuel cut off switch in case of accidents (impact activated). If your 1996 has one, has that been checked - might have become weak over the years.
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