Hard Start and Mis After driving for a while

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Jul 19, 2012 | 07:01 AM

driddick

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Instructor

Joined: Aug 2011

Posts: 114

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Hard Start and Mis After driving for a while

Ok.. The car ran perfect until a few months ago

I have a Gen6 454 roller.. approximately 2000 miles..When I start it up to drive it fires and runs fine..

when Its shut it off.. If I try to restart it starts and runs fine..

If it sits for a few minutes maybe 10 or so.. it spits through the carb.. hard to turn over.. eventually if I continually try to crank it it will fire but runs like crap..

after it cools down generally 4 plus hours it runs fine again.. last night it sat for 1.5 hours and ran terrible

It has a MSD 6al, MSD coil, and MSD distributor

I originally thought it was vapor lock but after getting it started I thought driving it for 5 minutes would clear it up but it still misses... the next day.. starts right up

I have not changed the plugs in the 10 months or so I have owned it...

It does have spark during the hard start.. takes a lot of cranking .. spitting through the carb.. even back fires through the pipes when it finally starts and I am driving...

any help is appreciated..

Last edited by driddick; Jul 19, 2012 at 07:03 AM.

Jul 19, 2012 | 09:02 AM

'75

Le Mans Master

Joined: Dec 2007

Posts: 6,422

Likes: 591

From: McHenry Illinois

Heat soak comes to mind, maybe the gas in the carb boiling and flooding after shut down. But I would think that would clear up and run ok shortly after it starts.

Aug 7, 2012 | 03:11 AM

golden50

Cruising

Joined: Aug 2012

Posts: 13

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From: Phoenix Arizona

vacume issues do it to my 80 hard starting the more you drive it the worse it gets idiling and eventually driving. look for a vacume leak or a loose plug wire

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