Recent Topics
AAP 25% Off
by Egg_Head
06/22/18 06:03 AM
GM Ecotec 2.4 - Cracked Exhaust Manifold
by The Critic
06/22/18 05:05 AM
Half Price - Shell Helix HX7, Castrol Edge and GTX
by SR5
06/22/18 03:59 AM
Why hang your bicycle from the ceiling?
by mjoekingz28
06/22/18 03:47 AM
Oil For High Sustained RPM on BMW S52
by ZEK
06/21/18 10:41 PM
Chevy brought the blazer back
by WiskyBadger
06/21/18 10:07 PM
LC20 and uses in modern motor oil
by synman
06/21/18 10:01 PM
Full Synthetic CJ-4 or > 5W-30 or 10W-30
by LeTempt
06/21/18 09:57 PM
2018 RAM 1500 EcoDiesel
by OVERKILL
06/21/18 08:37 PM
Fram SureGrip coating
by mobilaltima
06/21/18 08:24 PM
Manual transmissioned electric car
by mjoekingz28
06/21/18 06:45 PM
1991 Toyota Previa New JDM engine Redline
by Kurtatron
06/21/18 06:26 PM
8 yr old channeling John Bonham
by Toy4x4
06/21/18 06:02 PM
Traveller nlgi 2
by Spitter
06/21/18 05:33 PM
Upgrading the Kohler 7000 series air cleaner
by Patrick0525
06/21/18 05:08 PM
Any nano reefers here?
by RichardS
06/21/18 05:04 PM
ARC remanufactured Power Steering Pump
by Pajero
06/21/18 04:58 PM
John Deere "Easy Change" System gimmick
by SnowmanCO
06/21/18 04:55 PM
Oz Planstic Bag Bans - not so green.
by Shannow
06/21/18 04:31 PM
help me choose...
by chaindrive
06/21/18 04:07 PM
Newest Members
Fatbrowndog0822, DRNJR, ZEK, Dudewayne, kmdz
65294 Registered Users
Who's Online
71 registered (aquariuscsm, 4WD, BoiseRob, brages, 01rangerxl, BeerCan, 6 invisible), 1147 Guests and 30 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65294 Members
67 Forums
285753 Topics
4768995 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 3 1 2 3 >
Topic Options
#4583929 - 11/24/17 07:01 PM 2001 4.6 misfire on one cylinder
terry274 Offline


Registered: 10/16/10
Posts: 122
Loc: TN
My son in law has a 2001 F150 with the Triton 4.6 engine. It has 190,000 miles on it. A few weeks ago he had a misfire that set a PO302 code. He changed the COP on cylinder number 2 and that cleared the problem.

Now he has a PO307, cylinder number 7 misfire. He and I installed a new COP and put a new Motorcraft plug in 7.
It still generated a PO307. We swapped the new COP for one of the other COP's and still got a 307.

We then put a new fuel injector in that cylinder. That didn't help.

I connected a vacuum gauge to the brake booster hose and at idle the truck has a steady 18 hg of vacuum.

I realize I need to do a compression test at this point. Thats going to be a hassle on this truck. Is there anything else for me to check?

I can check the fuel pressure tomorrow but that shouldn't be on only one cylinder if it's low should it?

The misfire is severe enough to be noticeable in the cab.

Thanks,
Terry
_________________________
1996 Ford F150
2012 Honda Accord
2009 Ford Taurus

Top
#4583932 - 11/24/17 07:06 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Sounds like that cylinder is having trouble for sure... Compression test is what I would suggest given all that you have tried.


Edited by StevieC (11/24/17 07:08 PM)
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

Top
#4583944 - 11/24/17 07:15 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
Nick1994 Offline


Registered: 02/19/13
Posts: 10111
Loc: Phoenix, AZ
You didn't say anything about spark plug replacement...
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

Top
#4583948 - 11/24/17 07:18 PM Re: 2001 4.6 misfire on one cylinder [Re: Nick1994]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: Nick1994
You didn't say anything about spark plug replacement...


"He and I installed a new COP and put a new Motorcraft plug in 7" Coffee2


Edited by StevieC (11/24/17 07:18 PM)
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

Top
#4583966 - 11/24/17 07:36 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
Colt45ws Offline


Registered: 08/15/06
Posts: 9642
Loc: Central Washington
I would check for fuel and spark at that cylinder. Just because you replaced them doesn't mean some electrical issue didnt rear its head and they are not working.
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

Top
#4583971 - 11/24/17 07:43 PM Re: 2001 4.6 misfire on one cylinder [Re: Colt45ws]
terry274 Offline


Registered: 10/16/10
Posts: 122
Loc: TN
Originally Posted By: Colt45ws
I would check for fuel and spark at that cylinder. Just because you replaced them doesn't mean some electrical issue didnt rear its head and they are not working.


I have to pull that plug out to do a compression test, so I suppose I could crank the engine with the plug out and grounded just to make sure the coil is getting a signal.
_________________________
1996 Ford F150
2012 Honda Accord
2009 Ford Taurus

Top
#4583990 - 11/24/17 08:10 PM Re: 2001 4.6 misfire on one cylinder [Re: StevieC]
Nick1994 Offline


Registered: 02/19/13
Posts: 10111
Loc: Phoenix, AZ
Originally Posted By: StevieC
Originally Posted By: Nick1994
You didn't say anything about spark plug replacement...


"He and I installed a new COP and put a new Motorcraft plug in 7" Coffee2
Oooh! I thought he was still talking about number 2

Still weird to replace only 1spark plug...
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

Top
#4583999 - 11/24/17 08:15 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
Colt45ws Offline


Registered: 08/15/06
Posts: 9642
Loc: Central Washington
Originally Posted By: terry274
Originally Posted By: Colt45ws
I would check for fuel and spark at that cylinder. Just because you replaced them doesn't mean some electrical issue didnt rear its head and they are not working.


I have to pull that plug out to do a compression test, so I suppose I could crank the engine with the plug out and grounded just to make sure the coil is getting a signal.

If you hold the gas pedal to the floor, it activates "flood clear" mode in the ECU and will not operate the injectors, so you can crank without it starting.
Good for compression check, too.
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

Top
#4584004 - 11/24/17 08:26 PM Re: 2001 4.6 misfire on one cylinder [Re: Nick1994]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: Nick1994
Originally Posted By: StevieC
Originally Posted By: Nick1994
You didn't say anything about spark plug replacement...


"He and I installed a new COP and put a new Motorcraft plug in 7" Coffee2
Oooh! I thought he was still talking about number 2

Still weird to replace only 1spark plug...


No worries... cheers
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

Top
#4584009 - 11/24/17 08:36 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
FastLane Offline


Registered: 12/10/14
Posts: 448
Loc: MB - Manitoba
Check the connector hat runs to the COP. They are known to cause misfires.
_________________________
2010 Silverado 4.8 4x4 Mobil 1 5W30 ACDelco PF48E
2002 Mustang GT 4.6 Mobil 1 5W30 MC FL-820S
1966 Cessna 150 Phillips 20W50
2013 Mercury 30hp Merc 10W30

Top
#4584056 - 11/24/17 09:30 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
This is when you really need a nice bidirectional scan tool so you can run a relative compression test, monitor the cam signal, et cetera. I think the PC version of the ForScan app can do relative compression actually.

Top
#4584095 - 11/24/17 10:34 PM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
andyd Offline


Registered: 09/25/04
Posts: 7150
Loc: Marshfield , MA
I would think that a low cylinder would show up on a vacuum gauge as a fluttery needle or something?
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

Top
#4584148 - 11/25/17 03:05 AM Re: 2001 4.6 misfire on one cylinder [Re: Colt45ws]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Colt45ws
I would check for fuel and spark at that cylinder.


Why do that when you can throw parts at it ?

Top
#4584215 - 11/25/17 07:09 AM Re: 2001 4.6 misfire on one cylinder [Re: terry274]
Cujet Offline


Registered: 02/15/03
Posts: 7162
Loc: Jupiter, Florida
So, you know for sure that it's cylinder number 7? If you disconnect that cylinder, there is no/minimal change?

Or is it that the other plugs are old and not firing well?
_________________________

Top
#4584276 - 11/25/17 08:02 AM Re: 2001 4.6 misfire on one cylinder [Re: Cujet]
Kira Offline


Registered: 08/19/10
Posts: 5242
Loc: Champlain/Hudson Valley
Just for info's sake:
My friend has a '97 F-150 w/ 4.6l and he has the pair of 4 socket coils with spark plug wires going to each plug.
Since he bought the vehicle Fords come up in threads (like this) and in conversation and it appears to me that Ford used coils and COPs all over the year range of the 4.6 and 5.4 engines.

There seems to be no rhyme or reason to it.

What is a "connector hat going to the COP", a plug of sorts?

Top
Page 1 of 3 1 2 3 >