Cylinder misfire question - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > Engine / Drivetrain Talk > 8 Cylinder Engines
Log In 

Cylinder misfire question

Thread Tools Search this Thread
Old 08-08-2014, 09:43 PM   #1
Junior Member
Join Date: Aug 2014
Posts: 2
Thanks: 0
Thanked 1 Time in 1 Post
Default Cylinder misfire question

I have a 1997 Ford Crown Victoria with a 4.6L V8. I know this is an F150 forum but this is a common motor in F150s and after trolling for a while you guys seem pretty knowledgeable so I thought I would throw out my problem and hope for some answers.

Check engine light code showed a cylinder 1 misfire. Partially pulled the plug wires from the passenger side coil pack and all are sparking. Also checked them at the plugs and getting spark. Cleared the check engine light and a 1/2 hour later got another check engine light. This one showed a cylinder 3 misfire. Same passenger coil pack. All still sparking after checking again.

I swapped the coil packs, cleared the code and went for a drive. Check engine light came on, had the code checked and got a cylinder misfire on #3. The misfire did not 'follow the coil pack'.

Originally had a misfire on #1, then #3, swapped coil packs and got an misfire on #3, again. Car only has 58,000 miles and is in very good condition. My next thought is to replace the plug wires. Seems odd to get misfires on different cylinders.

Any insight would be most appreciated.
lakedawgs is offline   Reply With Quote
Join F150 Forum

Join Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that is a great community to join. Best of all it's totally free!

Join Today! - Click Here JOIN FOR FREE

Old 08-11-2014, 07:08 PM   #2
Junior Member
Join Date: Aug 2014
Posts: 2
Thanks: 0
Thanked 1 Time in 1 Post

Ohm tested the coil packs.

Primary passenger side is 2.0 and 2.0, driver side 2.0 and 2.0, should be .3-1.0 Ohms.
Secondary passenger side is 13.85K and 13.37K, driver side 13.35K and 12.65K, should be 6.5K-11.5K Ohms.

I'm thinking this proves the coil packs are bad.
lakedawgs is offline   Reply With Quote
The Following User Says Thank You to lakedawgs For This Useful Post:
curtisking316 (02-06-2016)
Old 09-05-2014, 08:27 AM   #3
Junior Member
Join Date: May 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts

My truck done that and it was a bad ground to the frame on passenger side

Last edited by crazy35752; 09-05-2014 at 08:32 AM.
crazy35752 is offline   Reply With Quote
Old 12-02-2014, 12:17 PM   #4
Senior Member
Join Date: Jan 2011
Posts: 696
Thanks: 0
Thanked 6 Times in 6 Posts

Depending on how accurate your multimeter is and how much internal resistance it has, the primary windings could be normal, but I'd say your secondaries are way out. New coils should at least help. Did you maybe swap the #1 and #3 spark plugs when you took them out to check for spark? That could explain the seemingly random jump of the misfire.
joshtowal is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8) carp104 2004 - 2008 Ford F150 39 08-09-2016 06:32 PM
misfire codes need help '05 FX4 mtulett1 2004 - 2008 Ford F150 5 10-05-2015 11:05 AM
level lift - spacer size vs actual lift question 02fx4dude 2015 - Present Ford F150 10 09-14-2015 07:37 PM
Misfire Issues 2005 F150 FX4 155K 73zeak 2004 - 2008 Ford F150 0 09-13-2015 12:48 PM
Extended gas tank. Getemshug 2015 - Present Ford F150 1 09-02-2015 08:25 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 06:06 PM.

Copyright 2006 - 20011
This site is in no way affiliated with the Ford Motor Company.