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Old 04-28-2019, 08:13 PM   #1
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Brand: Still Looking
State: California
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THOR #14639
Angry Mis fires of f450

We have a 2019 Thor z28 with the Ford f450 10 cyclinder. We keep getting check engine light and reading shows mis fires of cyclinders #2 and #9. In garage twice and mechanics can find nothing wrong. Anybody have this problem?
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Old 04-28-2019, 09:49 PM   #2
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Model: Tiffin Wayfarer 24 BW
State: New York
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THOR #8860
Welcome to the Forum!
Are ou sure that they took a close look at all of the connections?
(I like to never assume anything...)
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Old 04-28-2019, 10:06 PM   #3
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Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
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THOR #13362
Gas cap
Coils
MAP sensor (manifold absolute pressure sensor)
Oxygen sensor
Injectors
Fuel filter

The service mgr generally will do the least intrusive remedy first, with no regard of your inconvenience for unlimited follow-up visits

Good luck
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Old 04-29-2019, 01:40 AM   #4
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Model: Quantum RS26
State: Indiana
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THOR #10823
I'll add plug wires to Taylorbob's list. Things get pretty tight and hot under the E450 hood and one or two wires could be "induction firing" under load. One question however, independent garage or Ford dealership garage?
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Old 04-29-2019, 02:11 AM   #5
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A Ford dealer would be able to hook the computer to the OBD II port and drive it to duplicate the problem and get a real idea of what the trouble is. This should be under warranty, stay on them to find it.
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