Search



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

Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

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 04-05-2007, 03:56 AM   #11
JMD
6th Gear Member
 
JMD's Avatar
 
Join Date: Jan 2007
Vehicle: 39 Ford
Location: AR
Posts: 5,468
Default RE: Engine stalls - intermittent

Quote:
ORIGINAL: Mach1972

OK, Drained the gas tank and no sign of rust or corrosion. Nothing on the "sock" either. What should I checknext?
Coil???

When the car is not running,,, do you have a strong spark????
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________
Building cars is EASY, building cars right is a mite bit harder.

JMD is offline   Reply With Quote
Old 04-05-2007, 10:43 AM   #12
Mach1972
 
Join Date: Apr 2007
Posts: 26
Default RE: Engine stalls - intermittent

How can you test the spark with the engine not running? Or, maybe I don't understand.
Mach1972 is offline   Reply With Quote
Old 04-05-2007, 10:52 AM   #13
andrewmp6
6th Gear Member
 
Join Date: Oct 2006
Location:
Posts: 8,162
Default RE: Engine stalls - intermittent

hes asking when it acts up is the spark normal or less id give it a tune up maybe rebuild the carb
andrewmp6 is offline   Reply With Quote
Old 04-05-2007, 12:58 PM   #14
Mach1972
 
Join Date: Apr 2007
Posts: 26
Default RE: Engine stalls - intermittent

It doesn't really "act up". It either runs great or dies, no in between.
Mach1972 is offline   Reply With Quote
Old 04-05-2007, 01:04 PM   #15
Hornblower
I ♥ Acer
 
Join Date: Dec 2002
Location: USA
Posts: 148
Default RE: Engine stalls - intermittent

It sounds like the engine is being starved for fuel. Somewhere in your fuel delivery system you have a problem. Either you have a blockage, or your fuel pump is about to go out on you.
Hornblower is offline   Reply With Quote
Old 04-05-2007, 01:57 PM   #16
JMD
6th Gear Member
 
JMD's Avatar
 
Join Date: Jan 2007
Vehicle: 39 Ford
Location: AR
Posts: 5,468
Default RE: Engine stalls - intermittent

Quote:
ORIGINAL: Hornblower

It sounds like the engine is being starved for fuel. Somewhere in your fuel delivery system you have a problem. Either you have a blockage, or your fuel pump is about to go out on you.
You need to narrow your problem down to a system, The hit or miss thing is not working.

Start with the basics of pre-computer diagnosis,

Ignition
Fuel
Timing

Check these out in a systematic manner. See if you have spark, pull a wire off of a plug, hold it close to a metalic object and have someone roll the engine over, if you have a good strongsparkwhen the engine is not "running" (wont run), then you can eliminate the ignition.

Again, when the car wont run, look down the carburator, and open the throttle a few times, if the carb is pumping fuel into the carburator (accelerator pump) then the carb is getting fuel to it, you have eliminated the fuel pump and linesas the problem. Even if the carburator is still suspect, the car should at least fire if the accelerator pump is dumping gas into the manifold. (do not try to start the car while looking into the carb)

Put a timing light on the car, if the timing is on, this can be eliminated.

By doing this, you can at least narrow your search down to a single system, either fuel or ignition.

It seems as if everyone is pointing you in the fuel direction, they may be right, and they may be wrong...... pretend like you are doing an internet search,,,, narrow your results, or, just keep changing parts helter skelter and fixing things that aint broke.

Also, if the car is running, and suddenly dies, without stuttering and such, I would say that it is not a fuel issue,,,,, if you are still in the changing parts mode, change the coil, they are cheap enough.
__________________
Building cars is EASY, building cars right is a mite bit harder.

JMD is offline   Reply With Quote
Old 04-05-2007, 02:24 PM   #17
Mach1972
 
Join Date: Apr 2007
Posts: 26
Default RE: Engine stalls - intermittent

Thanks JMD. Let me add that there is never an opportunity to check the spark the way you describe because the the engine will start right up every time after it dies (stalls).
Mach1972 is offline   Reply With Quote
Old 04-05-2007, 02:52 PM   #18
JMD
6th Gear Member
 
JMD's Avatar
 
Join Date: Jan 2007
Vehicle: 39 Ford
Location: AR
Posts: 5,468
Default RE: Engine stalls - intermittent

Quote:
ORIGINAL: Mach1972

Thanks JMD. Let me add that there is never an opportunity to check the spark the way you describe because the the engine will start right up every time after it dies (stalls).
If the car starts right away each time, then it may not be the coil, I was under the impression that it did not always start up right away, but I would still go through the procedure as described in my previous post.

If the car does start right away, the problem will be harder to diagnose. Also you might want to check for vacuum leaks as well.
__________________
Building cars is EASY, building cars right is a mite bit harder.

JMD is offline   Reply With Quote
Old 04-21-2007, 11:23 AM   #19
Mach1972
 
Join Date: Apr 2007
Posts: 26
Default RE: Engine stalls - intermittent

We think we have narrowed the problem down to the tach and coil.
When the car is running, the volt meter shows 11 - 12 volts at the coil. Compared to a buddies car at8 volts. According to the wiring diagram the (stock) tach is supposed to bring the voltage down to around 5 - 7 volts with some sort of resistancewhile engine is running. It does not appear to be doing this. Could the coil be "heating up" and causing the intermittent stalling/bucking? We're really scratching our heads, what do you guys think? Thanks, again.

[IMG]local://upfiles/65468/F3BA822AA6044A0294158403F1A2D625.jpg[/IMG]
Mach1972 is offline   Reply With Quote
Old 04-21-2007, 05:42 PM   #20
fastbackford351
Foghorn Leghorn
 
fastbackford351's Avatar
 
Join Date: Dec 2006
Vehicle: 1967 Fastback & 2002 GT Convertible
Location: Florida
Posts: 1,911
Default RE: Engine stalls - intermittent

I had a problem very similar to that when I first got my fastback.

It turned out that the accelerator linkage was pushing back against an ignition wire just enough to cause it to disconnect momentarily. It would start right back up, but under acceleration it would die again.

I finally found the splice and replaced the whole wire, end to end. No splices. No problem.
__________________
Government Warning:

Governments are extremely dangerous.
Death, imprisonment, theft of property
and loss of freedom will result from
giving them too much power.
fastbackford351 is offline   Reply With Quote
Old 04-21-2007, 05:42 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
1966, 351c, 68, 94, coil, dies, engine, gas, intermitent, intermittent, light, msd, mustang, pushing, stall, stalling, stalls

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
HELP! Sudden Acceleration !!! fredm54 2005 - 2014 Mustangs 64 05-26-2014 08:35 PM
94 computer problems 94mustang94 5.0L (1979-1995) Mustang 26 02-16-2009 10:17 PM
Ignition or not??? adr3naline Classic Mustangs (Tech) 12 03-12-2008 01:54 PM
Rough idle. Stalls. Rough climbing RPM. HELP! DrZOOM 5.0L (1979-1995) Mustang 12 05-11-2007 12:48 AM

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 02:30 AM.

© Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, 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