Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community 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 fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 10-05-2013, 06:36 PM
acarter92 acarter92 is offline
Freshman User
 
Join Date: Mar 2010
Posts: 37
acarter92 is starting off with a positive reputation.
Intermitten Spark on 87' 370

I have an 87' F600 with a 370...

Starting today (drove about 200 miles) it randomly will miss and loose power and then after anywhere from a few seconds or a few minutes it will go back to running normal. There is no in-between, it's either running great or missing really bad. This happened about a dozen times today on the highway doing about 2500 rpm... however it only did It while I was loaded (7 ton). It ran fine the whole way home empty. I couldn't find any consistency in the length of time it would act up or when it would start... but it was like someone flipped a switch.

When I got home I put a timing light on a few of the plug wires and they seem to spark intermittently even when it seems to be running well.

Any ideas? When it comes to this electrical crap I'm lost... but I feel like it has to be something like the coil or computer on the fender. Seems like if it were distributer or wire related it would do it all the time?

The truck has a brand new jasper motor with less than 1000 miles... has new plugs, wires, and the distributer seems to be fine and was replaced last year (before the new motor).

Thanks in advance...
Reply With Quote
  #2  
Old 10-08-2013, 04:35 AM
ArdWrknTrk's Avatar
ArdWrknTrk ArdWrknTrk is offline
<---Dog is my co-pilot
 
Join Date: Jan 2008
Location: EXTREME southwest CT
Posts: 18,321
ArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputationArdWrknTrk has a superb reputation
Is the coil really hot when this happens?
Like too hot to touch for more than a second?
If not, the coil is okay.

If the engine has a new distributor (and pickup) I would definitely say these are all the symptoms of a failing DuraSpark ignition module.

The module can be replaced in a couple of minutes.
Two electrical plugs and three screws holding it in place.

You can find anything from an AutoZone $35 cheapie to a $100+ genuine Motorcraft part.
I have a NAPA Echlin module in my truck now and it has been trouble free, so far.
__________________
Jim (AKA Princess Glitzhooter)
'87 F-250
460, 4V 0-80457s, Edelbrock Intake, Saginaw PS Pump, BW 1356 4x4, 4.10 10.25", 130A 3G Alt., PMGR starter, ZF-5, - Lil' Red
http://i246.photobucket.com/albums/gg117/donjamer/FTE%20Pics/blumax500-1-1.jpgFTE Fraternity of Blue Max
Reply With Quote
  #3  
Old 10-08-2013, 04:39 PM
acarter92 acarter92 is offline
Freshman User
 
Join Date: Mar 2010
Posts: 37
acarter92 is starting off with a positive reputation.
Quote:
Originally Posted by ArdWrknTrk View Post
Is the coil really hot when this happens?
Like too hot to touch for more than a second?
If not, the coil is okay.

If the engine has a new distributor (and pickup) I would definitely say these are all the symptoms of a failing DuraSpark ignition module.

The module can be replaced in a couple of minutes.
Two electrical plugs and three screws holding it in place.

You can find anything from an AutoZone $35 cheapie to a $100+ genuine Motorcraft part.
I have a NAPA Echlin module in my truck now and it has been trouble free, so far.
Thanks for the reply,

Yesterday after work I replaced the coil, distributer, cap, and ICM. It all only cost me about $80-$90 at advance-auto. Since it's not something I could diagnose very easily I figured I'd replace all the "suspects".

My next delivery is on Thursday so I'll find out then...

Austin
Reply With Quote
Old 10-08-2013, 04:39 PM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2 cylinders are flooding on speed density ??? help Foxhound^ 1987 - 1996 F150 & Larger F-Series Trucks 10 06-22-2014 01:07 AM
Bad fuel pump ? ? Chisel21 1987 - 1996 F150 & Larger F-Series Trucks 1 12-02-2012 05:15 PM
New spark plug wires causing missing and hesitation. jgirard 3.0L V6 3 06-19-2004 08:45 AM
1987 F150 Spark Knocks sometimes and runs rough kcomer 1987 - 1996 F150 & Larger F-Series Trucks 5 05-11-2003 01:27 PM
460 intermittent miss cobrajet Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 6 01-01-2003 07:42 PM



All times are GMT -5. The time now is 01:32 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
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. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup