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In this Discussion
- fst64_v8pwr September 2010
- jamesahager September 2010
- Oldcar_Mechanic September 2010
carb issue?
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I have a 66 chevelle with an early 70's 350, 4150 holley carb. I am having an issue when I accelerate. the engine seems sluggish and wants to die until it gets to 2500 rpms. After that it runs great. I have replaced the fuel pump and gas lines and tried adjusting the fuel mixture and timing. Nothing seems to work. Any suggestions?
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You don't say how it all started. Does it run the same in neutral or just under a load?
The first thing that comes to mind is maybe a plugged exhaust. Put a vauum gauge on the engine and accelerate. The vacuum will initially drop and recover to a repsectable reading if all is OK. If you have a plugged exhaust, the vacuum will stay low as long as you hold the throtle.
Keep us posted
Ron -
Now that you mention it, I put on new headers and exhaust and it doesnt idle as well as it used to. In addition to feeling sluggish, my gen light would come on and stall out the car. After finding multiple shorts in the wiring (fixed) and changing the alternator it seemed to fix that issue. I was hoping they were related because it was a pain in the rear, but I guess not. I'll throw a vacuum gage on and keep you posted. Thanks for the advice
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old car mechanic,
I just performed a vacuum test on the exhaust and it came back good. Readings were normal and when throttle was held down and released the gage jumped right back to correct position. This thing is driving me crazy. Im open to any and all ideas -
Another thought.
You don't say if you bought the car this way or if this happened after installing things like the carb.
You may be over carbureted.
If you have the specs on the carb, I would call someone like Summit or contact Holley directly and ask the experts.
You say the new alternator has help the running of the car. If you have point ignition, a low battery will give you terrible performance. Is the battery fully charged?
Ron -
Final Diagnosis. I am an Idiot. I have slightly higher than basic knowledge of cars and since I just got it 2 years ago, I am still learning since this is my first car with a carb. When I timed it, I never took off the vacuum hose to the distributor. Retimed it and some minor tweeking of the carb and it runs like a gem. Problem solved. Thanks again for the tips oldcar mechanic.
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I'm glad you got your problem resolved.
Sometimes it's the litle things that make the difference.
Ron -
happy you found out the problem so you didnt get price gouged by mechanics!
