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Author Topic:   ignition woes
cobravenom71
Gearhead

Posts: 856
From: Kissimee, Fl USA
Registered: Aug 2002

posted 08-23-2003 08:04 AM     Click Here to See the Profile for cobravenom71   Click Here to Email cobravenom71     Edit/Delete Message   Reply w/Quote
My 79 Mk-V had been running very poorly for a few weeks and after replacing all other tune-up parts, a new coil seemed to make it run perfect again.
I switched back and forth between the new and old coil a couple of times and the difference was clearly obvious.
It runs perfectly now except for one annoying glitch that it never did before: When idling in gear ( like at a stop light), after a few seconds, it starts to run real rough, nd if left alone will eventually stall. Putting it in neutral and blipping the gas a little helps for a few seconds, but it just rfuses to idle correctly.
Is it possible that the replacement coil does not put out enough 'juice' at low rpm? It is a typical aftermarket replacement from 'Auto-Zone'($9.00).It is a little shorter and smaller in diameter than the stock one.(I had to shim the new one with cardboard to get it to fit snugly in the bracket.)
The car runs perfectly during all other driving conditions. The carb is clean and well adjusted, and all tune up parts are either brand new or relatively new:
Cap & rotor ( brass) new
plugs new
wires less than a year

Timimg is adjusted correctly and the vacuum advance is working correctly.

I'm stumped. Any ideas?

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1971 'J' code 429 Mach 1
1976 'Starsky & Hutch' Torino (460)
1973 Grande
1973 Mach
1973 Convertible

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SteveLaRiviere
Administrator

Posts: 39232
From: Saco, Maine
Registered: May 99

posted 08-23-2003 02:20 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
You may be right. Are your spark plugs getting sooty?

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150

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cobravenom71
Gearhead

Posts: 856
From: Kissimee, Fl USA
Registered: Aug 2002

posted 08-23-2003 04:35 PM     Click Here to See the Profile for cobravenom71   Click Here to Email cobravenom71     Edit/Delete Message   Reply w/Quote
Well, when I say that the plugs are new, what I mean is that the plugs were new a couple of weeks before I put the new coil in. The car continued to run very poorly for a week or two with the new plugs but before I put the new coil in.
So now I'm thinking that maybe the 'new' plugs were somewhat fouled in those couple of weeks before the new coil came on the scene.
I am going to pull them tommorow and take a look-see.
Thanks for your help so far.

------------------
1971 'J' code 429 Mach 1
1976 'Starsky & Hutch' Torino (460)
1973 Grande
1973 Mach
1973 Convertible

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SteveLaRiviere
Administrator

Posts: 39232
From: Saco, Maine
Registered: May 99

posted 09-03-2003 09:28 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Another idea: Is your replacement coil an electronic ignition or points type?

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'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150

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