Engine cut out at 3000RPM

bsull

Club Member
Hi,
Having an issue where the car will cut out at around 3000 RPM. Not splutter out, the engine/electrics completely cut out when driving. Problem occurs only when driving.

Timing is set 14 BTDC (at idle); carbs are balanced and correct, cylinder compression (195psi across all 6), fuel pressure 5 psi (when standing - can't tell what it is when driving). Temperature normal. It seems like a potential electrical issue to me? when going from 2000-3000 rpm the engine is definitely not giving correct power.

72' 240z, L28 non turbo

Any suggestions appreciated,
Thanks
Brett
 

jonbills

Membership Secretary
Site Administrator
Do you have a points distributor or electronic?
If points, check the gap.
If thats not it, I'd get a timing light and see what advance there is at 3k, and if the firing is regular & stable. And even check if the spark disappears at 3k
 

bsull

Club Member
Thanks Jon -
Distributor is electronic.
Timing (vacuum hose off carb) - was 42 degrees at 2500 RPM. Very Occasionally would lose spark 1 when testing. Car would not cut out at 3000 RPM when standing still, only when driving under load.
I'll run some tests on alternator perhaps.
 

jonbills

Membership Secretary
Site Administrator
42 is a fair bit too much. Might well be the problem.
You should reset it to a max of 34 or 35 which will occur between 3 and 3.5k.
 
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