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
Sign in using an external account
Register Forgot Password?


Cylinder misfire question

Reply
 
 
 
 
Thread Tools Search this Thread
Old 08-08-2014, 09:43 PM   #1
Junior Member
 
Join Date: Aug 2014
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
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
lakedawgs is offline   Reply With Quote
Join F150 Forum

Join F150Forum.com 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 F150Forum.com is a great community to join. Best of all it's totally free!

Join F150Forum.com 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 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

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
lakedawgs is offline   Reply With Quote
Old 09-05-2014, 08:27 AM   #3
Junior Member
 
Join Date: May 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

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
Feedback Score: 0 reviews
Default

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
Old 12-02-2014, 12:17 PM
 
 
 
Reply


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 10:40 PM.


Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.