I have a 1994 ford e350 motorhome 460 cid.engine cuts out and sometimes dies at idle or mild accelaraton.feels like random misfire or ign.switch is turned off than on.have already replaced sparkplugs,dist.cap,rotor,ign wires,fuel filter,ign module,dist accembly,coil,i took it to ford dealer and they couldnt fix it.please could you help me
Change the ignition modules that helps 955 of the miss, I then changed fuel pump as it was heating up and I feel stress the ign module curcuits.
all fine now,, Spend a fortune up till this point.. plugs, wires, injectors, relays, coil, EGR, o2, exhaust manifolds....urgh
Possible bad fuel pump or fuel pump relay.
Wish I could answer your question, then I would have my problem solved. I have a 1994 For E-350 w/ 460 engine & exactly the same problems. Replaced all the same items as you explained, still have the same problem. If you find the problem, please let me know. This is also a Rockwood Motor Home. Very frustrating. I cannot even find a Ford Dealer to check out the computer on this thing, they are always to busy .
E-Mail me at [email protected]
Thank You
my name is Jerry Noerr
Check the EEC-IV engine control module on it. The early to mid 90's control modules develop over time a problem with leaking capacitor(s) on the circuit board. This will cause a seeming random miss at idle and under load. I replaced about every part on the motor without success until I read a post about it. Remove the EEC module from the firewall in the engine compartment and open the top plate. Look for the tell tale signs of a leaking capacitor including a fluid ring around it on the circuit board and green crud corrosion where it solders onto the board. I had mine rebuilt for $216 and it runs great again. The capacitors go bad over time and eventually leak. Have all 3 (in my case one of 3 had leaked) replaced if you have it done.
×
Ford 7.5 ltr engines have 2 fuel pumps a high pressure and a low pressure when replacing the pump did you replace both?
Ford 7.5 ltr engines have 2 fuel pumps a high pressure and a low pressure when replacing the pump did you replace both?
×
There are few possibilities that can cause engine misfire
issues. It can be issue with spark plugs or faulty spark plugs. Also get the
compression test done for cylinders. If any of cylinder shows low compression
then required, then that particular cylinder will cause misfire.
Also get obd codes scanned, the error code will let you know
which cylinder is misfiring or all cylinders are misfiring.
-----------
For your trouble shooting I suggest you to refer the help
oinks below. It has step by step details for many engine misfire issues.
----------
Click the link below:-----
Ford Explorer Cylinder Misfire?
http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html
---------
Engine Misfire codes on Chevrolet Malibu?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
---------
Cylinder 6 Misfire?
http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html
------------
Misfire on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
-----
While stop engine idles like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
----------
Ford Explorer 5.0L: Engine Miss?
http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html
-----------
Oil on spark plugs and car misfires?
http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html
------------
Can cylinder misfire Damage the Catalytic converter?
http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html
------------
Car misfires and error code P0306 and P0303 is shown?
http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html
-----------
Chevrolet K1500 No spark, random misfire
http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html
-------------
2004 Ford F150: Engine Misfire and Lean Code?
http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html
-----------
1995 Toyota LS: Misfire at idle or low RPM
http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html
--------------
Toyota Corolla:
Random Misfire?
http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html
----------
2006 Ford Freestar: Misfire on Cylinder Number 2?
http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html
-----------------------------
This will help.
Thanks.
4,986 views
Usually answered in minutes!
1996 Ford E-350 van with 7.5L intermittantly acts like ignition is totally cutting out for about a tenth of a second when at idle or under slight throttle. Intermittant individual cylinder missing under WOT acceleration. Only 45,000 miles on the vehicle which is driven mainly on short trips in tropical location.
My 95 E-350 does the exact same thing! Will start here...I've done EXTENSIVE research on this problem. Since we have the same thing exactly down to the PCM not communicating to the "scan tool".
I'm going to get a fuel pressure reading from the fuel rail just inside the the motor cover. Warnings associated with this type of test!
Too much pressure can "load up" the cylinder and produce a "random" misfire. I can start my e-350 fine and it seems as though the problem starts 100 seconds after it has been sitting for some period of time longer than a couple of hours. Also it doesn't matter if it's a super cold day or warm. After the van say builds up fuel pressure 100 sec after running you can cut if off immediately and begin all over again. The problem shows immediately. I would say this is not a warm or cold thing and not an EGR thing. No EGR in neutral / park and this is were we see it plus in overdrive or cruising in 3rd with minimal load. Makes sense doesn't it. We'll see after i go and purchase a fuel pressure gage set.
I got the codes from the self
test watching the dash light and came up with the EGR Position Sensor.
I replaced that and no change. After another forum answer.cars guy said
to replace it....but didn't explain why i was getting the "miss" while
in park/neutral. EGR doesn't flow in park/neutral! Just wanted my
money. Also spent 1k for distributor/plugs and other maintenance with
no change. So I have also replaced the EGR solenoid as well. Gone down
that EGR road. Started to think it's my coil or ignition after thinking
that i loose volt at that vacume can just to the left of the EGR
solonoid while this "miss" occurs. I put my vac tester on the top
nipple which when this can opens up will allow vac to pass through.
When the miss happens i loose vac instantanously since the can looses
power.
Also thought this could be an ECM problem like you since my
"X-Ray" brand scanner will not work on this van. However works on my
other cars fine??? What fixed your E-350 please tell !!!
One thing i can say is the fuel pressure test where you turn the key and the pump should produce pressure in the line before starting does give the pressure. However this pressure should stay UP steady for no less than 5 minutes so the manual says. My pressure falls immediately after returning the ignition to previous state.
So i thought i might send my injectors to mr.injector.com to get them diagnosed and repaired. Report listed bad patterns but NO leak down on any of them. So what would cause the fuel pressure to drop? Could this be the fuel pressure regulator even thought when i did the vac test on the regulator it changed pressure in relation to vac being added and removed. I would rather replace these items before going to the tank to replace the fuel pump. thanks!
Check the EEC-IV engine control module. The 90's era modules develop leaky capacitor(s) on the circuit board and fail. I also replaced most parts on the engine with no change. Finally discovered there was a problem with these modules. Remove the module from the firewall where the main wire harnesses connect. Take off cover and examine the circuit board. Look for the tell tale signs of the leaking capacitor(s) including a fluid stain ring around it on the circuit board and green crud corrosion where it solders onto the board. Mine caused erratic misses about every 20-30 seconds at idle and random misses under load on grades...and stalling once in a while at idle. I had it rebuilt for $216 and it runs normal again.
×