Poor MPG

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Mar 3, 2019 | 03:06 PM

#151

BatteriesNotIncluded

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Joined: Jan 2019

Posts: 190

Likes: 1

Confirmed with Forscan Lite. Misfire on #10.

@Flyboy1100 Take a look at these results, you think I should look at #6 too?

=== Results ===

Oxygen Sensor Voltage Amplitude, Bank 1, Sensor 1
TID: 1
CID: 11
Value: 0.82 Volt
Limit: >= 0.50 Volt

Oxygen Sensor Voltage Amplitude, Bank 2, Sensor 1
TID: 1
CID: 21
Value: 0.83 Volt
Limit: >= 0.50 Volt

Oxygen Sensor Switchpoint, Upstream
TID: 3
CID: 1
Value: 0.45 Volt
Limit: >= 0.00 Volt

Oxygen Sensor Switchpoint, Downstream
TID: 3
CID: 2
Value: 0.50 Volt
Limit: >= 0.00 Volt

Rear to front switch ratio, Bank 1
TID: 10
CID: 11
Value: 0.00 :1
Limit: <= 0.80 :1

Unknown test
TID: 26
CID: 0
Value: 28663.00
Limit: >= 28160.00

Unknown test
TID: 26
CID: 0
Value: 28663.00
Limit: <= 28672.00

Unknown test
TID: 27
CID: 0
Value: 0.00
Limit: <= 24576.00

Unknown test
TID: 28
CID: 0
Value: 0.00
Limit: <= 24576.00

Unknown test
TID: 2A
CID: 0
Value: 0.00
Limit: >= 33843.00

Unknown test
TID: 2B
CID: 0
Value: 0.00
Limit: >= 35328.00

Unknown test
TID: 2C
CID: 0
Value: 0.00
Limit: <= 24576.00

Unknown test
TID: 2D
CID: 0
Value: 0.00
Limit: <= 24576.00

Total Engine Misfire Rate & Type B Threshold
TID: 50
CID: 0
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 1
TID: 53
CID: 1
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 2
TID: 53
CID: 2
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 3
TID: 53
CID: 3
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 4
TID: 53
CID: 4
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 5
TID: 53
CID: 5
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 6
TID: 53
CID: 6
Value: 0.47 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 7
TID: 53
CID: 7
Value: 0.00 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 8
TID: 53
CID: 8
Value: 0.02 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 9
TID: 53
CID: 9
Value: 0.02 %
Limit: <= 1.43 %

Misfire Rate & Type A Threshold, Cylinder 10
TID: 53
CID: A
Value: 3.44 %
Limit: <= 1.43 %

Highest Type A Misfire Rate & Threshold
TID: 54
CID: 0
Value: 9.80 %
Limit: <= 19.58 %

Highest Type B Misfire Rate & Threshold
TID: 55
CID: 0
Value: 3.95 %
Limit: <= 1.43 %

Cylinder Events Tested
TID: 56
CID: 0
Value: 2355.00
Limit: <= 5000.00
===

Mar 3, 2019 | 08:21 PM

#152

Flyboy1100

Laughing Gas

Joined: Oct 2017

Posts: 1,143

Likes: 13

From: ND

i would swap 1&6, 2 front coils side to side
and 10 with 9 or 8.

if your misfires follow you have something funky with the COPs or plugs. if they don't it is probably in the wiring to the COPs

those aren't real high misfire rates though(#6), how long was that running/you driving ?

Mar 3, 2019 | 08:38 PM

#153

BatteriesNotIncluded

Thread Starter

Senior User

Joined: Jan 2019

Posts: 190

Likes: 1

Wasn't running long. It was so cold today!

Misfire value on 10 is high, and a definite miss, but the others are low enough I'm not gonna worry for now.

Mar 3, 2019 | 10:43 PM

#154

1 Excursion camper

Cargo Master

Joined: Oct 2006

Posts: 2,097

Likes: 5

From: chicago northwest suburbs

One misfire on a cylinder can create random misfires on other cylinders. I would concentrate on number 10 for now.

Mar 4, 2019 | 09:28 AM

#155

Flyboy1100

Laughing Gas

Joined: Oct 2017

Posts: 1,143

Likes: 13

From: ND

Quote:

Originally Posted by BatteriesNotIncluded

Wasn't running long. It was so cold today!

Misfire value on 10 is high, and a definite miss, but the others are low enough I'm not gonna worry for now.

swap #10 with #6 and see if the values flip flop. if they do, then the original #10 COP is bad.

at least it is the easily accessible side

should only take a couple mins to swap them

Mar 4, 2019 | 03:57 PM

#156

BatteriesNotIncluded

Thread Starter

Senior User

Joined: Jan 2019

Posts: 190

Likes: 1

Swapped coils, same deal.

How often is a Motorcraft plug bad out of the box?

Mar 4, 2019 | 05:14 PM

#157

Flyboy1100

Laughing Gas

Joined: Oct 2017

Posts: 1,143

Likes: 13

From: ND

Quote:

Originally Posted by BatteriesNotIncluded

Swapped coils, same deal.

How often is a Motorcraft plug bad out of the box?

no idea, but it happens. At least it appears your COPs are working.

Got a meter to check for power at the connectors? Could be bad wiring or plug could be fouled out

Mar 4, 2019 | 07:30 PM

#158

1 Excursion camper

Cargo Master

Joined: Oct 2006

Posts: 2,097

Likes: 5

From: chicago northwest suburbs

Pull the plug and check the gap, then swap it with another cylinder. If its still the same it`s either going to be wiring or possibly an injector.

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Mar 4, 2019 | 07:34 PM

#159

Flyboy1100

Laughing Gas

Joined: Oct 2017

Posts: 1,143

Likes: 13

From: ND

Quote:

Originally Posted by 1 Excursion camper

Pull the plug and check the gap, then swap it with another cylinder. If its still the same it`s either going to be wiring or possibly an injector.

i always forget about injectors. i have never had a vehicle that has had a bad one

Mar 4, 2019 | 07:49 PM

#160

1 Excursion camper

Cargo Master

Joined: Oct 2006

Posts: 2,097

Likes: 5

From: chicago northwest suburbs

Yep, they don’t go bad very often, but when they do people forget about them. Just a thought!

Mar 5, 2019 | 08:53 AM

#161

Greenscobie86

Posting Guru

Joined: Feb 2005

Posts: 1,344

Likes: 3

From: NYC

Just my 2 cents, but if you have new plugs and the coils appear fine, check the coil wiring/connector first.

Possibly a bad injector but like Flyboy I've honestly never had a Ford product with a bad injector, or any other make for that matter.

Mar 5, 2019 | 10:45 AM

#162

BatteriesNotIncluded

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Senior User

Joined: Jan 2019

Posts: 190

Likes: 1

Swapped out the plugs. No dice. It's gotta be the wiring.

How do I test it?

Listened to the injectors with a stethoscope. All sound fine

Mar 5, 2019 | 02:37 PM

#163

Greenscobie86

Posting Guru

Joined: Feb 2005

Posts: 1,344

Likes: 3

From: NYC

Someone with electrical experience will chime in I'm sure but I'd probably put a test light on it since there are only 2 terminals on the coil. Again I'm not an electrician by any means but since these trucks are known to have COP wiring connectors go bad(due to age/heat) your issue might be a damaged coil connector or a pinched wire in the COP harness.

If the connector is all good visually, I'd break out the wiring diagrams and chase it down.

Mar 5, 2019 | 08:29 PM

#164

Flyboy1100

Laughing Gas

Joined: Oct 2017

Posts: 1,143

Likes: 13

From: ND

just with a multimeter. unplug it and see if it has voltage. I don't have time to dig in the FSM right now to see if there is a more detailed procedure

Mar 5, 2019 | 10:13 PM

#165

BatteriesNotIncluded

Thread Starter

Senior User

Joined: Jan 2019

Posts: 190

Likes: 1

Tested for voltage. Seemed good when compared to known good plug connector.

Scanned again afterward and now #10 is showing value of 0.90% so it's limit isn't being tipped at >=1.43% anymore. Not misfiring anymore according to mode $06, although minor vibes still possibly present at idle. I say possibly as I don't know if I'm being overly sensitive to it now.

So strange. Compression issue maybe?

More soon when I've run through this tank.

Appreciate everyone's contributions to this long *** thread.