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I parked my 71 C10 in good running order for 2 weeks while I went on vacation, it started first time on my return and idled fine, but when I took it out for a run and gave it some Gas it started bogging and miss fireing, when I floor the Gas pedal it picks up but still is not perfect. I replaced the fuel lines from the pump to the carb...no change, I then found that the Trans modulator was blowing Trans fluid up the vacum hose to the engine so I replaced that...still no change, I removed all the plugs and cleaned them they were prety clean when they came out...but no change. It's been a week now and it is still the same. How can a Truck that was running so well a couple of weeks ago go so wrong on it's own? any help will be greatly apreciated.

Submitted: 454 days and 11 hours ago.

Category: Chevy

Value: $12

Status: AWAITING CUSTOMER ACTION

1971 Chevrolet Cheyenne C10 454

Already Tried:
Fuel line and filter change.
Transmision Modulator.
Spark Plug remove and clean.

Posted by Dave Nova 454 days and 5 hours ago.

Answer

Probably a piece of debris in the carburetor main jet. Which carburetor do you have?

453 days and 23 hours ago.

Reply

View Full Image
" alt="graphic" width="70" height="30" />Holley Performance carb, always frightened to touch carbs incase I mess things up more.

Edited by XXXXXXXXXXX on 8/25/2008 at 6:00 AM

Posted by Dave Nova 453 days and 14 hours ago.

Answer

Remove the float bowl on the end of the carburetor. The main jet is in the metering block at the bottom. Look for any debris in the jet. Clean jet and bowl with carburetor cleaner spray and reassemble.

453 days and 14 hours ago.

Reply

Thankyou, but which bit is the float bowl in the pic?

Accepted Answer

Here is some literature from Holley that will help you identify parts on your carburetor.

http://www.holley.com/data/TechService/Technical/Carburetor%20Tech%20Info.pdf

Accepts:
Expert:	Dave Nova
Pos. Feedback:	99.2 %
Answered:	8/25/2008

ASE Certified Technician

20+ years experience. ASE Master and Advanced Level L1 Certification.GM World Class Certification

453 days and 14 hours ago.

Reply

Thanks Dave for your help, I will try what you have suggested if this dosen't resolve it then I expect i'll be back for your help again.
Nigel.

Posted by Dave Nova 453 days and 12 hours ago.

Answer

You are welcome. Let me know if I can help any further.

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1971 Chevrolet Cheyenne C10 454 Already Tried: Fuel line and filter change. Transmision Modulator. Spark Plug remove and clean.

Answer

Probably a piece of debris in the carburetor main jet. Which carburetor do you have?

Reply

View Full Image " alt="graphic" width="70" height="30" />Holley Performance carb, always frightened to touch carbs incase I mess things up more.Edited by XXXXXXXXXXX on 8/25/2008 at 6:00 AM

Answer

Remove the float bowl on the end of the carburetor. The main jet is in the metering block at the bottom. Look for any debris in the jet. Clean jet and bowl with carburetor cleaner spray and reassemble.

Reply

Thankyou, but which bit is the float bowl in the pic?

Accepted Answer

Here is some literature from Holley that will help you identify parts on your carburetor. http://www.holley.com/data/TechService/Technical/Carburetor%20Tech%20Info.pdf

Reply

Thanks Dave for your help, I will try what you have suggested if this dosen't resolve it then I expect i'll be back for your help again.Nigel.

Answer

You are welcome. Let me know if I can help any further.

Related Chevy Questions

1971 Chevrolet Cheyenne C10 454

Already Tried:
Fuel line and filter change.
Transmision Modulator.
Spark Plug remove and clean.

View Full Image
" alt="graphic" width="70" height="30" />Holley Performance carb, always frightened to touch carbs incase I mess things up more.

Edited by XXXXXXXXXXX on 8/25/2008 at 6:00 AM

Here is some literature from Holley that will help you identify parts on your carburetor.

http://www.holley.com/data/TechService/Technical/Carburetor%20Tech%20Info.pdf

Thanks Dave for your help, I will try what you have suggested if this dosen't resolve it then I expect i'll be back for your help again.
Nigel.