Engine stalls - intermittent
04-04-2007, 01:01 PM
#1
Thread Starter
Join Date: Apr 2007
Posts: 26
Engine stalls - intermittent
I have a 1972 Mach 1 (351C/FMX). I was driving around town a couple weeks ago and out of the blue, my engine dies. It restarted easily and the died again upon acceleration. I limped it home after many restarts and began to try to diagnose. Since then, my mechanic friend and I have tried to find the problem. It will run fine for a mile test drive without even a hiccup, next time I can't even get it out my driveway. It idles fine. Since it is intermittent, it's been impossible to pinpoint the problem. We have done the following so far:
Changed pertronix back to points
New ignition switch (discovered old one had some melted wires)
Went through and reapaired all wiring in engine and dash wiring harness
No water in fuel although at one point the gas looked a dark gold color in the glass fuel filter instead of the light yellow
Meter tested all electronics including coil
New points, condenser, plugs, cap, rotor, wires
All (stock) accessories work fine
Any input would be GREATLY APPRECIATED
(I'm losing sleep over this one) THANKS!
Changed pertronix back to points
New ignition switch (discovered old one had some melted wires)
Went through and reapaired all wiring in engine and dash wiring harness
No water in fuel although at one point the gas looked a dark gold color in the glass fuel filter instead of the light yellow
Meter tested all electronics including coil
New points, condenser, plugs, cap, rotor, wires
All (stock) accessories work fine
Any input would be GREATLY APPRECIATED
(I'm losing sleep over this one) THANKS!
04-04-2007, 01:24 PM
#2
3rd Gear Member
Join Date: Jul 2005
Location: Sugar Land, Texas
Posts: 566
RE: Engine stalls - intermittent
Seems like the problem of the week in this forum has been carb issues. If I were to guess, possible rust build up in gas tank which got into the carb causing intermittent blockage. Do you have the original gas tank and sending unit? Fuel line might be a little dirty as well....check the carb and rebuild...keep us posted on your progress...
04-04-2007, 02:40 PM
#3
Thread Starter
Join Date: Apr 2007
Posts: 26
RE: Engine stalls - intermittent
My mechanic took the top of the carb off (Carter 625 AFB) and found a small amount of residue in the bottom of thebowl(s), somewhat grainy, but VERY fine in texture. It had a blueish/green tint to it. What could THIS be? Could it be the cause?
Thanks.
Thanks.
04-04-2007, 04:32 PM
#7
6th Gear Member
Join Date: Jan 2007
Location: AR
Posts: 5,469
RE: Engine stalls - intermittent
ORIGINAL: Mach1972
I have a 1972 Mach 1 (351C/FMX). I was driving around town a couple weeks ago and out of the blue, my engine dies. It restarted easily and the died again upon acceleration. I limped it home after many restarts and began to try to diagnose. Since then, my mechanic friend and I have tried to find the problem. It will run fine for a mile test drive without even a hiccup, next time I can't even get it out my driveway. It idles fine. Since it is intermittent, it's been impossible to pinpoint the problem. We have done the following so far:
Changed pertronix back to points
New ignition switch (discovered old one had some melted wires)
Went through and reapaired all wiring in engine and dash wiring harness
No water in fuel although at one point the gas looked a dark gold color in the glass fuel filter instead of the light yellow
Meter tested all electronics including coil
New points, condenser, plugs, cap, rotor, wires
All (stock) accessories work fine
Any input would be GREATLY APPRECIATED
(I'm losing sleep over this one) THANKS!
I have a 1972 Mach 1 (351C/FMX). I was driving around town a couple weeks ago and out of the blue, my engine dies. It restarted easily and the died again upon acceleration. I limped it home after many restarts and began to try to diagnose. Since then, my mechanic friend and I have tried to find the problem. It will run fine for a mile test drive without even a hiccup, next time I can't even get it out my driveway. It idles fine. Since it is intermittent, it's been impossible to pinpoint the problem. We have done the following so far:
Changed pertronix back to points
New ignition switch (discovered old one had some melted wires)
Went through and reapaired all wiring in engine and dash wiring harness
No water in fuel although at one point the gas looked a dark gold color in the glass fuel filter instead of the light yellow
Meter tested all electronics including coil
New points, condenser, plugs, cap, rotor, wires
All (stock) accessories work fine
Any input would be GREATLY APPRECIATED
(I'm losing sleep over this one) THANKS!
A clue to a defective coil might be some of the fluid leaking through the seams, but it can be defective without leaking.
My brother in law had to replace an MSD coil after being on his car for only about 2 months. The issue was intermitant for a while, then the car stopped running all together.
In addition, if you are metering a coil as to the voltage passing through the coil, it may read "ok" while still being shorted out internally. In order to meter the coil, resistance, (ohms), will need to be checked and verified while it is malfunctioning. Unfortunatly, I have no idea what level of resistance a coil is supposed toimpose, but it is certainly much more than "0".
04-04-2007, 05:22 PM
#8
4th Gear Member
Join Date: Jun 2006
Location: Eke, Belgium
Posts: 1,264
RE: Engine stalls - intermittent
I am thinking rust intank, as he talks fuel colour and stuff in fuel bowl of carb. So i would be tempted to think about changing the gas tank, pretty easierly done and not too expensive and is not a bad idea anyways.
04-05-2007, 03:35 AM
#10
2nd Gear Member
Join Date: Dec 2006
Location:
Posts: 432
RE: Engine stalls - intermittent
have same issue,,just got last rid of rubber fuel line stuff with fuel injector rubber lines ( they have a wierd blue rubber coating inside) acid bath for my tank right off the bat,,but you never know
