Go Back   MustangForums.com > Ford Mustang Tech > V6 (1994-2004) Mustangs
Sign in using an external account
Register Forgot Password?
Search


V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
Sponsored by Optima Batteries


Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 12-27-2011, 03:57 PM   #1
DEADEYE7
 
Join Date: Feb 2009
Vehicle: 2001 FORD MUSTANG
Location: GA
Posts: 4
Default 2003 v6 engine misfire at high rpm or load

I have a 2003 v6 which started missing under load or when I rev car in neutral above 3000 rpms it starts cutting out. It has 105000 miles. It threw codes P0316 and P0301. I pulled plug on cylinder 1, and it was light tan and gaped about .060. Looked for obvious vacuum leaks , etc. Not sure where to begin to troubleshoot without throwing money at parts with all the different sensors. Last mustang I had was a 87 gt, which was easy to work on. Any ideas on where to start first? How do I check the coil pack? My guess is there first.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
DEADEYE7 is offline   Reply With Quote
Old 12-29-2011, 08:42 AM   #2
petrock
4th Gear Member
 
Join Date: Nov 2006
Vehicle: '98 3.8L Mustang Convertible
Location: CA
Posts: 1,580
Default

I'd start with the plugs & wires first. The vibration from the high RPM's may be wiggling something lose. Another thing to try is to drive the car to a dark & ventilated location and pop the hood. Then reproduce the problem while a buddy looks into the engine bay. Look all over the engine for any flashes of light (a.k.a. sparks). Something may be shorting and causing the misfire. If there is a spark, it will be fairly small and may or may not make a clicking noise. So the less ambient light you have around you the better.

If your handy with a multi-meter, you can contact your local AutoZone. They have a spec sheet for our coil packs which has the resistance levels for the primary & secondary coils that you can test yourself.

Good luck...
__________________
'98 3.8L Convertible (Red w/ White top)
petrock is offline   Reply With Quote
Old 01-05-2012, 06:12 PM   #3
lilpanther
 
Join Date: Jan 2012
Vehicle: 2002 Ford Mustang
Location: SC
Posts: 10
Default

I was having this issue last year and it ended up being my Cam shaft Synchronizer. I replaced the spark plugs, spark plug wires, coil pack, and the fuel filter and we finally figured out the cam shaft synchronizer was the culprit. And mine only had 55,000 miles on it when all of this happened.
lilpanther is offline   Reply With Quote
Old 01-06-2012, 07:05 PM   #4
mustangmike09
2nd Gear Member
 
mustangmike09's Avatar
 
Join Date: Jun 2009
Vehicle: 2004 Ford Mustang
Location: TX
Posts: 219
Default

coil pack is oen of the most common failures on these cars
__________________
Body Toning and Weight Loss and more
Please like my page if you want it see that this Does Work.
M.Wells It Works - Sulphur Springs, TX - Health Food Store, Fitness Center | Facebook
Can go straight to product browsing here:
https://mwells911.myitworks.com/Shop/Category/175
mustangmike09 is offline   Reply With Quote
Old 01-07-2012, 10:02 PM   #5
petrock
4th Gear Member
 
Join Date: Nov 2006
Vehicle: '98 3.8L Mustang Convertible
Location: CA
Posts: 1,580
Default

Quote:
Originally Posted by mustangmike09 View Post
coil pack is oen of the most common failures on these cars
It is also one of the most commonly misdiagnosed parts on these cars. Alot of people waste their time & money throwing parts at a problem instead of properly diagnosing it first, and the coil pack is one of the "go to" parts to replace when there is an ignition problem resulting in alot of perfectly good coil packs in the trash heap. Just sayin'...
__________________
'98 3.8L Convertible (Red w/ White top)
petrock is offline   Reply With Quote
Old 01-08-2012, 10:41 AM   #6
mustangmike09
2nd Gear Member
 
mustangmike09's Avatar
 
Join Date: Jun 2009
Vehicle: 2004 Ford Mustang
Location: TX
Posts: 219
Default

Quote:
Originally Posted by petrock View Post
It is also one of the most commonly misdiagnosed parts on these cars. Alot of people waste their time & money throwing parts at a problem instead of properly diagnosing it first, and the coil pack is one of the "go to" parts to replace when there is an ignition problem resulting in alot of perfectly good coil packs in the trash heap. Just sayin'...
Your right, but common sense tells someone to check other things first. But I do realise that is a rare trait these days. Mine just went out a couple months ago around 55k miles on the car.

I pulled my 6 month old spark plugs and they looked fine. So after reading and researching and using some common sense/knowledge, I bought a new set of wires and a new coil pack. I first put on the wires to test problem. No change. Then I changed to the new coil pack. Problem fixed. So I took the wires and cleaned the couple of grease spots off and took them back w/ no problems at all.
So in the end, I went through all of my steps and only spent money on a coil pack which is exactly what My problem is.


But **** if your having a missfire like problem, check your damn plugs first. Thats common sense.....
__________________
Body Toning and Weight Loss and more
Please like my page if you want it see that this Does Work.
M.Wells It Works - Sulphur Springs, TX - Health Food Store, Fitness Center | Facebook
Can go straight to product browsing here:
https://mwells911.myitworks.com/Shop/Category/175
mustangmike09 is offline   Reply With Quote
Old 08-19-2012, 05:01 PM   #7
llcccc
 
Join Date: Aug 2012
Vehicle: 2003 Ford mustang
Location: texas
Posts: 1
Default Mustang 2003 v6

Quote:
Originally Posted by mustangmike09 View Post
Your right, but common sense tells someone to check other things first. But I do realise that is a rare trait these days. Mine just went out a couple months ago around 55k miles on the car.

I pulled my 6 month old spark plugs and they looked fine. So after reading and researching and using some common sense/knowledge, I bought a new set of wires and a new coil pack. I first put on the wires to test problem. No change. Then I changed to the new coil pack. Problem fixed. So I took the wires and cleaned the couple of grease spots off and took them back w/ no problems at all.
So in the end, I went through all of my steps and only spent money on a coil pack which is exactly what My problem is.


But **** if your having a missfire like problem, check your damn plugs first. Thats common sense.....


I have mustang 2003 just bough two weeks ago have the same problem It run very good at idle but running extremely rough while accelerating (at 300 rpm) I allready replaced 6 plugs and plugs wire but still have same problem what Ideal you will have for me

Thanks alot
llcccc is offline   Reply With Quote
Old 08-21-2012, 05:48 PM   #8
varnco
1st Gear Member
 
Join Date: Aug 2011
Vehicle: 1969, Ford, Mustang
Location: az
Posts: 55
Default

Check your coil pack with an ohm meter.

Check the connections from the power connection across the other 3 connections. The ohms across all 3 should be very similar. If one is off, it could be a bad coil pack.

You could also do the same to check them across cylinders on the coil pack. They should all have about the same resistance.
varnco is offline   Reply With Quote
Old 03-22-2014, 07:09 PM   #9
jfk1966
 
jfk1966's Avatar
 
Join Date: Mar 2014
Vehicle: 2002, ford, mustang
Location: NJ
Posts: 1
Default

My 2002 Mustang convertible had misfire underload, checked the fuel injector with a noid light, checked the plug and wire, all were good. Had some spark with vehicle not under load - changed out the coil pack for about $60 - took less than 5 minutes - and the entire issue was resolved. Car runs like a champ now.
jfk1966 is offline   Reply With Quote
Old 03-26-2014, 01:14 PM   #10
ryanam4793
 
Join Date: Mar 2014
Vehicle: 2001 Mustang V6
Location: WI
Posts: 5
Default

I would bet on a bad ignition coil. Exact same problem I had. Easy fix can do it yourself in less than 30 mins.
ryanam4793 is offline   Reply With Quote
Old 03-26-2014, 01:14 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
2003, 2004, 38, 38l, 99, car, cut, cutting, high, load, makes, misfire, missfire, missing, mustang, rpm, v6

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

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 10:20 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup