3tc sputters and dies

Webers, Cam selection and Ignition upgrades.

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3tc sputters and dies

Postby mycrors4 » Mon May 08, 2017 4:55 am

hey guys
so here's the problem im having
i had the stock carb with all the emissions crap

car wouldnt idle. sputtered and died. i could get it to idle if i raised idle to around 1500-1700rpm but it would still sputter. it would immediately dies if i went past 3k then let off gas

decided to remove the stock aisan since it has 40 million vacuum lines going to 40 million different ports

installed a brand new weber 32/36
car does the same thing
if i tune to idle around 850rpm the car sputters and dies

RPMS jump between 200rpms up/down

when i hit the pedal, the car hesitates as if it's not getting fuel then eventually itll pick up rpms again

when driving around above 2500rpm, the car drives fine. drives great actually.
its only when i let off throttle and get back on it that itll hesitate a little but if i smash the pedal doesnt hesitate at all

plugs/wires all new
couldnt find any vacuum leaks yet
timing has never been touched. picked up a timing gun and will be checking it as soon as i can
also picked up some new vacuum hoses to replace the old ones

the car does get fuel when cranking.

any idea on what it could be?

engine compression tests at 150/140/150/140 cylinder 1-4 respectively
valve seals are leaky
not sure if leaky valve seals would case such a major issue like this.

everything else overall seems fine

im completely stumped
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Re: 3tc sputters and dies

Postby BOBLOOK » Tue May 09, 2017 6:01 am

Is car this ignition electronic ? or point ?
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Re: 3tc sputters and dies

Postby mycrors4 » Tue May 09, 2017 5:56 pm

BOBLOOK wrote:Is car this ignition electronic ? or point ?

original ignition
small ignition module with a dizzy that's working good
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Re: 3tc sputters and dies

Postby BOBLOOK » Wed May 10, 2017 4:54 pm

This question was posted on fb 3tc right ?

It might be some sorcery on the car :lol: :lol: :lol: :lol: just kidding try to sage clean it jajaja
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Re: 3tc sputters and dies

Postby mycrors4 » Thu May 11, 2017 3:26 am

BOBLOOK wrote:This question was posted on fb 3tc right ?

It might be some sorcery on the car :lol: :lol: :lol: :lol: just kidding try to sage clean it jajaja

yea i posted it there haha

i figured it out
there was a vacuum leak between the breather plate under the carb adapter and the manifold

removed the breather plate, cut the studs shorter to fit, throw a filter on the valve cover breather and as of now i have it idling around 900rpm without accessories
stumbles a little bit in 2nd gear between 2k and 3k rpm if i dont give it enough throttle but it's no big deal. just gotta tune a bit more
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