I'm currently running a 4A-C motor with a 32/36 DGAV Weber, recently there have been issues under acceleration, when full throttle is used, or the rev's exceed 4,000rpm (generally when the second valve opens) the engine loses power and seems to stop firing on all cylinders.

 

Anyone have any idea what's wrong?

 

Thanks.

Stewart.

Checked the timing?

Points?

The leads and plugs?

sounds sort of like the secondary circuit in the carb is blocked and its not getting fuel through.

 

Is it fine when you''re just using the primary circuit?

Checked the timing?

Points?

The leads and plugs?

 

Well actually, I just swapped out the plugs and points and re-timed it myself.

Do you think I timed it wrong?

sounds sort of like the secondary circuit in the carb is blocked and its not getting fuel through.

 

Is it fine when you''re just using the primary circuit?

 

It occasionally mis-fires when cruising, but only under heavy acceleration does it get really bad.

New Symptom:

 

The problem is getting worse, loss of power and mis-firing happens at all levels of accelleration, not just heavy acceleration.

plug leads!!!

i have a AE82 also with a 4AC which is doing the same thing, drives fine when not using the secondaries but stand on it in any gear at any speed and it hesitates but if i slowly squeeze the throttle on as the engine speed increases its fine. going to take a closer look at mine this weekend

plug leads!!!

 

Might have to invest in some :/

my problem is sorted, found the dizzy had been fully retarded

my problem is sorted, found the dizzy had been fully retarded

 

Retarded as in broken? Or retarded as in Late Timing?

Retarded as in broken? Or retarded as in Late Timing?

 

I had a RWD 4A-C in a AE84.

Have you ever changed the timing belt? I did. The engine would cough at low end then almost boost up to about 4000rpm then just fizz out again. Couldn't get it right. Eventually the the valves burned out and she died. Turned out I was 1 tooth retarded on the belt....

I had a RWD 4A-C in a AE84.

Have you ever changed the timing belt? I did. The engine would cough at low end then almost boost up to about 4000rpm then just fizz out again. Couldn't get it right. Eventually the the valves burned out and she died. Turned out I was 1 tooth retarded on the belt....

 

Thanks, I'll check that too.

Retarded as in broken? Or retarded as in Late Timing?

 

 

late timing, dizzy was hard against the stop. pulled it to about the center and went for a quick drive and heard a very small ping and backed it off and now its all sweet

Looks like LowVp was right, the points had closed up and the Dizzy was retarded by about 5 degrees.

All fixed now.

Thanks to everyone who helped.

 

Stewart.

Edited April 26, 201016 yr by Gecko71