Whats wrong with my Carbs?, wants to stall leaving the traffic light. |
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Whats wrong with my Carbs?, wants to stall leaving the traffic light. |
HansJan |
Mar 25 2017, 09:12 PM
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#1
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Member Group: Members Posts: 394 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
Hello,
Not having much luck with the Search function. The car: 1972, with 103mm cylinders (2.3l), aftermarket cam and larger valves with double springs. Fuel supply: Dual EMPI HPMX 44 Carburetors, Jets: .55 Idle, 1.55 main, Air 1.75. History: After car-fire engine was out, heads taken off and some studs and springs replaced. Changed to quieter exhaust. Had trouble with dialing in the carburetors and changed the jets to the recommendations from EMPI (see above). It runs a lot better now. Remaining complaint; The car runs pretty good (especially above 2,800) RPM. However; It takes me a while to leave after each stop (stop signs traffic lights etc) because the car want to stall. When I push the accelerator to quickly the RPM dips down, and car will die. Only when I ease on the paddle very gently, it will increase in RPM, and I can lift clutch at above 1,500 RPM. Anyone here understands this issue? |
stugray |
Mar 27 2017, 11:51 AM
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#2
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
My most recent weber challenges:
1 - My accel pump diaphragms did not match. One was barely pumping. I found a way to measure how much came out each and found them to be WAY off. Replaced both and it made a world of difference. 2 - If using pump gas (in the US) with ethanol: This WILL clog your jets. As the gas sits in the bowls the ethanol absorbs water, then the gas and ethanol evaporates leaving the water in the bowls to corrode the aluminum. This leads to white powdery deposits in the bowls which will clog the jets. FILTERS do NOT help. (the ethanol destroys the diaphragms in most of our fuel pressure regulators too - they will only last about 1 year in ethanol) 3 - Intake manifold leaks. Sometimes they would leak when hot, but not cold. Do the WD40, starting fluid, or water spray test AFTER the engine has warmed up. see if you can make the engine stumble spraying around the manifold bases, carb bases, and throttle shafts. |
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