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11-02-2022, 04:37 PM
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#15
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Senior Member
Tiffin Owners Club Ford Super Duty Owner
Join Date: Jun 2016
Location: Town of Beloit
Posts: 363
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Nice
I always would rather be lucky than good!
__________________
2016 Tiffin 34PA, 2018 Ford Edge toad, Blue OX rear track bar, Cheap handling fix, Konis, Super Steer retired Ford tech/service manager, No Worry, No Hurry. "Livin The Dream" 
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11-06-2022, 03:45 PM
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#16
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Member
Join Date: Oct 2018
Location: San Diego, ca
Posts: 38
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Hopefully that fixed the problem, if not look at your battery to frame grounding connection, I suspect that there is a bad ground connection somewhere, sometimes ther may be multiple ground connections that bond body parts to the frame in different locations.
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2017 Coachman Pursuit 30FW, F-53 V-10
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11-06-2022, 03:47 PM
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#17
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Member
Join Date: Feb 2015
Posts: 32
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Wiring
I was going to suggest checking all ground wiring and terminals as well. It wouldn’t be the first time that a terminal had corroded or pulled loose. Tug on them to see if they’re tight and unbolt and clean them if you suspect them.
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11-06-2022, 03:59 PM
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#18
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Junior Member
Join Date: May 2022
Posts: 21
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Vacuum issue
The reason I say this is because you can avoid the issue by letting off the accelerator. What vacuum issue I have no clue.
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11-06-2022, 04:10 PM
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#19
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Junior Member
Join Date: Jul 2022
Location: Canyon Country,Ca
Posts: 10
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Max air flow sensor
Hello
I had the same problem with my class c. It was the Max Air flow Sensor. I had a new one put in and the motor home ran grate.
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11-06-2022, 08:42 PM
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#20
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Junior Member
Join Date: Aug 2021
Posts: 2
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i would check the mass airflow gage in the air intake
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11-07-2022, 09:16 AM
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#21
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Member
Newmar Owners Club Spartan Chassis
Join Date: Nov 2011
Location: Fort Langley BC
Posts: 41
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The catalytic converter would be a suspect, it may be plugged
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11-07-2022, 10:06 AM
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#22
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Member
Join Date: Jun 2016
Posts: 46
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Being off the throttle could only be a difference because the engine is in a slightly different position due to the rubber engine mounts. It could also be because no current is flowing through the intermittently bad wire at the time.
The cats have nothing to do with this from the symptoms.
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11-07-2022, 12:46 PM
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#23
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Senior Member
Join Date: Feb 2015
Location: Grapevine, Tx
Posts: 5,632
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Quote:
Originally Posted by Caboman1
i would check the mass airflow gage in the air intake
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What is a mass airflow gage in the air intake?
__________________
2004 Fleetwood Southwind 32VS W20 - SOLD!
ReadyBrute Elite towing a 2017 Ford Edge Sport
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11-07-2022, 01:47 PM
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#24
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Community Moderator
Join Date: Aug 2011
Posts: 6,198
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Quote:
Originally Posted by F4Gary
What is a mass airflow gage in the air intake?
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11-07-2022, 02:00 PM
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#25
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Member
Join Date: Sep 2021
Location: Allison Park, Pennsylvania
Posts: 45
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It’s definitely a wiring problem, like one of the previous poster said, wiggle everything all electrical plugs, junctions etc. it’s something in a circuit. If you can find out what causes the wrenc light to come on then go to that circuit and unplug and plug in the wires guaranteed you’ll find the problem.
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11-07-2022, 02:49 PM
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#26
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Senior Member
Join Date: May 2017
Posts: 1,299
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Quote:
Originally Posted by thomashill1
Update. Went back to shacking cable harnesses. Found that a thick 12v supply line that feeds the main fuse box in the engine compartment was cutting into metal frame and actually sparked when I wiggled it hard . It did not throw the wrench light when it sparked, but I have to think it has something to do with it. I have covered the broken insulation in electrical tape. And pulled the cable up in a different direction so it no longer comes in contact with that piece of metal.
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Personally, I would get a piece a heavy rubber hose (heater hose) cut it a couple inches longer than the original rubber area, slit the hose and apply it over the rubber area. Secure with zip ties. I know you have rerouted the cable, but I am into "belts and braces" !
__________________
Retired. 31 year of automotive engineering for one of the Detroit 3, specializing in Powertrain Control Systems.
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11-07-2022, 02:50 PM
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#27
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Senior Member
Join Date: May 2017
Posts: 1,299
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Quote:
Originally Posted by hedwards
The catalytic converter would be a suspect, it may be plugged
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Highly unlikely based on symptoms.
__________________
Retired. 31 year of automotive engineering for one of the Detroit 3, specializing in Powertrain Control Systems.
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11-07-2022, 02:54 PM
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#28
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Senior Member
Join Date: May 2017
Posts: 1,299
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Quote:
Originally Posted by TomWhetzel
Hello
I had the same problem with my class c. It was the Max Mass Air flow Sensor. I had a new one put in and the motor home ran grate.
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Hopefully it was replaced with a genuine Ford part ! Fuel injection systems are very "picky" about certain parts, especially "critical" ones like MAF and HEGO.
__________________
Retired. 31 year of automotive engineering for one of the Detroit 3, specializing in Powertrain Control Systems.
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