Classic Mustangs List Archive

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Mail From: Nancy Blair (email redacted)

Hi all, We are having a major problem with our Boss 302. It will start
and run as long as the key is in "start" position. As soon as we let
go, it dies! Checked and double checked all connections, power to coil,
etc. Suspected vaccuum leak so replaced intake manifold gaskets.
Plugged all other sources of vaccuum leaks. Checked the timing. All
cylinders fire when in "start", but as soon as key is released to "run"
it dies. Help! Desperate for any possible suggestions of something
we've missed! TIA


Robin & Nancy Blair
'70 Boss 302
Toledo, OH


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Mail From: Chris Tann (email redacted)

Hi,

> All
> cylinders fire when in "start", but as soon as key is released to "run"
> it dies. Help! Desperate for any possible suggestions of something
> we've missed! TIA

Possibly the ignition switch?

Chris.


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Mail From: Wal Marshall (email redacted)

Robin & Nancy Blair

> Hi all, We are having a major problem with our Boss 302. It will start
> and run as long as the key is in "start" position. As soon as we let
> go, it dies! Checked and double checked all connections, power to coil,
> etc. Suspected vaccuum leak so replaced intake manifold gaskets.
> Plugged all other sources of vaccuum leaks. Checked the timing. All
> cylinders fire when in "start", but as soon as key is released to "run"
> it dies. Help! Desperate for any possible suggestions of something
> we've missed! TIA

I'd go back to basics with this. Strongest option is a power failure to the
coil. Is there 12 V at the coil with the ignition on and engine stopped? If
so, then a possibility is that the Governor fitted to the Boss 302 is
malfunctioning and killing the ignition as soon as the engine is running.
The supply to the coil is via the governor box. Try disconnecting the
governor and feeding the coil via a lead straight from the battery (Just
temporarily because it will supply 12V to a coil designed for 8V) . If
that's OK I 'd consider replacing or bypassing the governor box.

Good luck

Wal Marshall
Wellington New Zealand
70 351C 4V Fastback


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Mail From: Ronald Cordes (email redacted)

Nancy,

Do you still have power to coil when in run position, If not then there
you go, did you already rule out electrical, (intake gaskets?...So soon)

Ron<----Hates previous owners


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Mail From: (email redacted) (email redacted)

Sounds like the solenoid. They are cheep, give it a try.

Paul Bradway
70 Mustang coupe
72 LTD convertible
Looking at a 67 gt fastback 390 4 speed [like I rely need a new project]

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