No Start Weak Spark - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Australian Ford's Discussion > E-Series Falcons
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-01-2004, 09:22   #1 (permalink)
NB & NCII V8 Fairlanes
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 2,908
No Start Weak Spark

The NB (3.9 MPEFI) wouldn't start Thursday morning and my wife called the RAC who said their was no spark and it was the TFI module.

Well an inline spark tester (globe thingo that fits between plug and HT lead) shows that that there is a spark albeit a very weak one that can't jump even a small plug gap. I have tested both the TFI module and coil and found:

a) TFI module is OK although just in case I replaced it with a spare I had (from last time the RAC said I had a dud one) with no change. The resistances at each point on the old TFI module once removed were also to specs.
b) The coil itself test OK at the coil and the HT lead from the coil is OK but if I try and test the primary resistance at the TFI connector I get 1.7 K ohms instead of the .4 to .5 ohms the Ford Factory Manual says says. The wire between the coil and pin 4 of the TFI connector is also 1.7 K ohms so it seems there is a high resistance in this circuit which leaves me to suspect a fault in the harness, ECU or ignition switch.
b) The KOEO self diagnostics yields no fault codes.
c) The battery is fully charged.
d) A noide light placed in the low tension coil plug glows brightly when I try and start so it seem to be getting power OK.
e) The fuel pump and relay is working. The ECU relay also clicks so I assume it's working.
f) The injectors are getting power pulses (noide lights flash).
g) The small pink wire from the TFI with the white connector that sits on the ISC solenoid is not broken.

I have done all the electronic tests at the TFI and coil per both Gregory's and Ford factory manual and other than the high resistance in the primary circuit to the TFI connector and very weak spark everything checks out OK. I have't been able to the checks at the ECU and ignition key yet because it's raining and while my car is in the shed I can't open both doors to get at either. So while I am waiting for some fine weather I thought I would ask if anyone else had any ideas of the liklely cause.
__________________
Regards Blue
Aussiblue is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-04-2004, 07:55   #2 (permalink)
NB & NCII V8 Fairlanes
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 2,908
Re: No Start Weak Spark

I must stop working on my cars when I have had little sleep. It has dawned on me that despite the fact that the coil resistances check out OK it must be a dud if a noide light connected to the primary plug flashes brightly but there is no spark from the HT coil lead. I will buy a coil tomorrow and take the opportunity to reposition it somewhere where I don't need a trained octopus to reach it.
__________________
Regards Blue
Aussiblue is offline   Reply With Quote
Old 08-04-2004, 08:35   #3 (permalink)
Powered by HAD
 
AusXH's Avatar
 
Join Date: Jul 2001
Location: Central Coast NSW
Age: 32
Posts: 1,328
Re: No Start Weak Spark

Its almost a two man job to make it easy. One person holding the coil from underneith whilst the other using 3/8" sockets and extensions (they fit between the runners) simply undoes/does up the bolts. Its certainly not the best job to have to do.

Good luck and I hope it solves your problem.
__________________
PVTXR01
AusXH is offline   Reply With Quote
Old 08-05-2004, 06:37   #4 (permalink)
NB & NCII V8 Fairlanes
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 2,908
Re: No Start Weak Spark

Been there; taking the inlet manifold off was in the long run the easiest solution.
__________________
Regards Blue
Aussiblue is offline   Reply With Quote
Old 08-07-2004, 08:56   #5 (permalink)
NB & NCII V8 Fairlanes
 
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 2,908
Re: No Start Weak Spark

New coil fixed it but it wasn't a fun job.
__________________
Regards Blue
Aussiblue is offline   Reply With Quote
Old 08-07-2004, 21:28   #6 (permalink)
No longer around
 
MADNC_8's Avatar
 
Join Date: Jun 2002
Location: Geelong
Age: 34
Posts: 4,882
Re: No Start Weak Spark

i had to change a coil on an EA with an EF BBM manifold and that was hard enough, i could lonly imagine how hard it was with the EA-ED type manifold!
MADNC_8 is offline   Reply With Quote
Old 08-11-2004, 05:47   #7 (permalink)
NZ
feed me hey
 
Join Date: Jul 2002
Age: 65
Posts: 4,692
Re: No Start Weak Spark

Quote:
Originally Posted by MADNC_8
i had to change a coil on an EA with an EF BBM manifold and that was hard enough, i could lonly imagine how hard it was with the EA-ED type manifold!
did you change it or did you watch
__________________
Dot Aye You
NZ is offline   Reply With Quote
Old 08-11-2004, 05:51   #8 (permalink)
No longer around
 
MADNC_8's Avatar
 
Join Date: Jun 2002
Location: Geelong
Age: 34
Posts: 4,882
Re: No Start Weak Spark

no i changed teh coil, scott changed teh dizzy after i put it in wrong
MADNC_8 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Australian Ford's Discussion > E-Series Falcons



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cant start car and smoke out carby keysersozeCUST Inline 6 Tech 3 03-08-2004 23:30
Xb 351 wont start xespack Classic Falcons 4 05-20-2003 16:39
URGENT : CFI->MPI, no spark Sundeep Inline 6 Tech 5 05-06-2003 22:47
AU hard to start after left for long periods KenOath General Tech 5 04-09-2003 21:19
It won't start! HoonBoy Cleveland Tech 18 04-22-2002 07:20

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 14:53.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.