If you’ve installed the Holley 670 Street Avenger on your Chevrolet and are facing some issues, you’re not alone. Many enthusiasts encounter challenges with this carburetor during installation and while tuning for optimal performance. In this post, we’ll break down some common problems and troubleshooting tips to help you get back on track.
Common Problems
Poor Fuel Economy: Many users report that their vehicle’s fuel economy drastically decreases after installing the 670 Street Avenger. Here are some possible causes:
Incorrect float level settings
The power valve may be opening too soon
The main jet may be too large
Engine Stalling or Rough Idle: If your engine stalls or has a rough idle, it could be due to:
Vacuum leaks around the carburetor
Incorrect idle mixture adjustments
Insufficient fuel delivery from the pump
Hard Starting After Installation: A common complaint is difficulty starting after installing the carburetor. Possible reasons include:
Improper choke settings
Fuel line issues
Possible flooding during startup
Troubleshooting Tips
Check Float Level: Use a sight glass or a clear tube to check the float level, ensuring it’s set according to Holley’s recommendations.
Adjust Idle Mixture: Start with the engine running and gradually adjust the mixture screws on both sides to achieve the best idle quality.
Inspect for Vacuum Leaks: Use carb cleaner or a smoke test to find vacuum leaks which could be causing unstable idle issues.
Seeking Advice
If you’re still having trouble after trying these solutions, don’t hesitate to ask for help. Please provide details about your setup (engine specs, other modifications, etc.) along with any symptoms you’re experiencing. The more information you provide, the better the community can assist you!
Conclusion
The Holley 670 Street Avenger is a great choice for many Chevy engines, but it can come with its quirks. By addressing common issues and reaching out for advice, you can optimize its performance and enjoy your ride. Let’s hear your experiences and any additional tips you might have!
One common problem with the Holley 670 is that it may be running too rich or lean. It could be worthwhile to check the jet sizes and adjust the floats accordingly.
I’ve tried adjusting the mixture screws, and it helped a bit with the idle, but the acceleration is still lacking. It feels like I’m dragging a trailer!
I’m having some real trouble with the jetting on my Holley 670. It backfires occasionally, so I think it might be too rich. Any tips on where to start adjusting the jets?
Have you checked the idle mixture settings? A good starting point is to turn them in until they lightly seat and then back them out 1.5 turns. That could help with the richness!
What kind of symptoms are you seeing with your tune? My friend had similar symptoms, and he just needed to adjust his idle speed. Sometimes it’s the little things!
I’m curious, what jets are you currently using? It really helps to know that, especially if you’re in a higher altitude area. Adjustments can vary significantly!
Honestly, the Holley 670 has its quirks, but once you find the sweet spot, it’s pretty solid! It just requires some patience during tuning. Keep at it!