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2001 4.6 misfire on one cylinder #4583929
11/24/17 08:01 PM
11/24/17 08:01 PM
Joined: Oct 2010
Posts: 138
TN
terry274 Offline OP
terry274  Offline OP
Joined: Oct 2010
Posts: 138
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
2011 Toyota Avalon
2012 Honda Accord
2009 Ford Taurus
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4583932
11/24/17 08:06 PM
11/24/17 08:06 PM
Joined: Aug 2008
Posts: 18,744
Ontario, Canada
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 18,744
Ontario, Canada
Sounds like that cylinder is having trouble for sure... Compression test is what I would suggest given all that you have tried.

Last edited by StevieC; 11/24/17 08:08 PM.

'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4583944
11/24/17 08:15 PM
11/24/17 08:15 PM
Joined: Feb 2013
Posts: 10,719
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,719
Phoenix, AZ
You didn't say anything about spark plug replacement...


2015 Hyundai Sonata 2.4L 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: 2001 4.6 misfire on one cylinder [Re: Nick1994] #4583948
11/24/17 08:18 PM
11/24/17 08:18 PM
Joined: Aug 2008
Posts: 18,744
Ontario, Canada
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 18,744
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

Last edited by StevieC; 11/24/17 08:18 PM.

'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4583966
11/24/17 08:36 PM
11/24/17 08:36 PM
Joined: Aug 2006
Posts: 9,811
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,811
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
Re: 2001 4.6 misfire on one cylinder [Re: Colt45ws] #4583971
11/24/17 08:43 PM
11/24/17 08:43 PM
Joined: Oct 2010
Posts: 138
TN
terry274 Offline OP
terry274  Offline OP
Joined: Oct 2010
Posts: 138
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
2011 Toyota Avalon
2012 Honda Accord
2009 Ford Taurus
Re: 2001 4.6 misfire on one cylinder [Re: StevieC] #4583990
11/24/17 09:10 PM
11/24/17 09:10 PM
Joined: Feb 2013
Posts: 10,719
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,719
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 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4583999
11/24/17 09:15 PM
11/24/17 09:15 PM
Joined: Aug 2006
Posts: 9,811
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,811
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
Re: 2001 4.6 misfire on one cylinder [Re: Nick1994] #4584004
11/24/17 09:26 PM
11/24/17 09:26 PM
Joined: Aug 2008
Posts: 18,744
Ontario, Canada
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 18,744
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


'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4584009
11/24/17 09:36 PM
11/24/17 09:36 PM
Joined: Dec 2014
Posts: 488
MB - Manitoba
FastLane Online content
FastLane  Online Content
Joined: Dec 2014
Posts: 488
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 Mystic 25W40
Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4584056
11/24/17 10:30 PM
11/24/17 10:30 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'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.

Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4584095
11/24/17 11:34 PM
11/24/17 11:34 PM
Joined: Sep 2004
Posts: 7,533
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,533
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
Re: 2001 4.6 misfire on one cylinder [Re: Colt45ws] #4584148
11/25/17 04:05 AM
11/25/17 04:05 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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 ?

Re: 2001 4.6 misfire on one cylinder [Re: terry274] #4584215
11/25/17 08:09 AM
11/25/17 08:09 AM
Joined: Feb 2003
Posts: 7,442
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,442
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?


People who count on their fingers should maintain a discreet silence.
Re: 2001 4.6 misfire on one cylinder [Re: Cujet] #4584276
11/25/17 09:02 AM
11/25/17 09:02 AM
Joined: Aug 2010
Posts: 5,693
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,693
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?

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