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Discussion Starter · #1 ·
Hey guys I think I need to fine tune this engine ....and I need help ...car starts no problem and runs good at idle ... But when I attempt rev it pops in carb and stutters to rev up or accept fuel ...what's going on here
 

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Dirtdolla said:
Hey guys I think I need to fine tune this engine ....and I need help ...car starts no problem and runs good at idle ... But when I attempt rev it pops in carb and stutters to rev up or accept fuel ...what's going on here
Does the accelerator pump deliver a shot of fuel the instant the throttle is opened?
 

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Discussion Starter · #4 ·
Not a new carb but intake was removed ....never took carb off intake just took apart as one ...cobalt ...yes to your question or to me it is from what I can see ...like maybe a lil too much I'm thinking I guess I should back down on idle throttle and play with air/fuel mix .....question I got is ...what piece of diagnostic equipment can I buy to properly diagnose
 

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WFO
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Dirtdolla said:
Not a new carb but intake was removed ....never took carb off intake just took apart as one ...cobalt ...yes to your question or to me it is from what I can see ...like maybe a lil too much I'm thinking I guess I should back down on idle throttle and play with air/fuel mix .....question I got is ...what piece of diagnostic equipment can I buy to properly diagnose
I suppose a wide band air/fuel meter might help diagnose and tune it, but the cost is high.

Before going that route, I would try more or less accelerator pump shot to see if that showed me anything. You will need to use different accelerator cams and possibly shooters to tune the accelerator pump circuit. More on that HERE.

If that didn't cure it, I would be sure the advance curve and the initial timing is enough for the engine- too little initial advance (retarded timing) will cause the engine to pop back through the carb.

What is the carb number? What do the plugs look like?
 
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