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  Ignition problem ?

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Author Topic:   Ignition problem ?
Robert K
Gearhead

Posts: 476
From: Nashville, TN
Registered: Apr 2000

posted 09-17-2001 01:43 PM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
When I rev past 4000 RPM's my car stumbles/bogs/vibrates (it's hard to describe). I'm still running points and condenser and wondered if a switch to a Pertronix system would possibly fix this problem. I checked the float level in the carb (Holley 4160) and it is fine.

Also, many months ago, I remembered seeing a post or link concerning a reinforcement for the drivers side motor mount that looked like it was made out of a turnbuckle. I want to put one on my car but now can't find the information. Does anyone remember this or know what I'm talking about ?

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67convertible 289/auto
65fastback 302/4sp

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RonnieT
Gearhead

Posts: 469
From: Port Allen, La. 70767
Registered: Jun 99

posted 09-17-2001 10:14 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
Robert,


It sounds like your points might be bouncing at higher rpm's, if this is the fact then the Pertronics wil help you out. Another problem could be running too much timing, if you have more than 38 or so degrees it can cause this problem.

Forgot to mention that I remember someone posting about t a turn buckle to hold the engine down, but I don't remember who it was.
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Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

[This message has been edited by RonnieT (edited 09-17-2001).]

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Fastback68
Gearhead

Posts: 1313
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 09-18-2001 12:45 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
Buckles holding the engine down also rings a bell with me. Wasn't that a trick employed in Shelbys?

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Robert K
Gearhead

Posts: 476
From: Nashville, TN
Registered: Apr 2000

posted 09-18-2001 08:22 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
I think I may have found the problem. I was looking at the vacuum advance assembly last night and decided to check it with my trusty mityvac hand pump. The rubber diaphram on the vacuum advance must be leaking because it won't hold any vacuum pressure. Which means I'm not getting any advance at all. I'm going to replace this assembly and I think I'm going to go ahead and make the change to the Pertronix system. I'll keep the points and condenser in my tool box 'just in case'.

I'm still looking for more info on the motor mount 'helper'. I guess a chain would do the same thing but the turnbuckle method looks so much better.

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67convertible 289/auto
65fastback 302/4sp

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SteveLaRiviere
Administrator

Posts: 30721
From: Saco, Maine
Registered: May 99

posted 09-18-2001 06:03 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I think these are what you are looking for:

https://mustangsandmore.com/ubb/Forum12/HTML/001247.html

https://mustangsandmore.com/ubb/Forum12/HTML/001104.html

https://mustangsandmore.com/ubb/Forum12/HTML/001104.html

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
PROUD TO BE AMERICAN!!!

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Robert K
Gearhead

Posts: 476
From: Nashville, TN
Registered: Apr 2000

posted 09-19-2001 09:22 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
Exactly what I was looking for !!
Thanks Steve !

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67convertible 289/auto
65fastback 302/4sp

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SteveLaRiviere
Administrator

Posts: 30721
From: Saco, Maine
Registered: May 99

posted 09-19-2001 04:10 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
My pleasure, buddy.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
PROUD TO BE AMERICAN!!!

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Robert K
Gearhead

Posts: 476
From: Nashville, TN
Registered: Apr 2000

posted 09-21-2001 08:37 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
Ok, I've put on a new vacuum assembly on the distributor and it has helped the problem but there is still something fishy going on at 4K RPM's. Actually the car idles fine but runs kind of jerky at slow speeds. At 4500, the tach needle was slightly erratic also.
So what do I do now ?
1. Install new points and condensor ?
2. Install a Pertronix ?
3. Install a new distributor ? I've got an Autolite on it right now (D04A I think) By the way, can anyone make any recommendations ?? I don't care about being stock. Alex ???


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67convertible 289/auto
65fastback 302/4sp

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