JohnTaurus
Full Access Member
- Joined
- Mar 25, 2020
- Posts
- 152
- Reaction score
- 158
- Location
- Mississippi
- First Name
- John
- Truck Year
- 1974
- Truck Model
- C10 Custom
- Engine Size
- 250 CID Inline 6
Hey guys, first off, let me say that I hate carburetors. It was my only hangup about buying this truck, and sure enough, its proving to be just as troublesome as those I've had on imports and Fords.
This is not the factory carburetor. It came from O'Reilly auto parts and they couldn't give me much info on it. My cousin bought it, and he was there, but they really had nothing for it. Carburetor is not old, maybe 1-2 years.
Issues:
Will not start in the morning without a shot of gas down it's throat. Fuel pump replaced yesterday with Delphi unit, no help. Fuel filter inspected and cleaned as well.
Now, it doesnt like starting warm without pumping the throttle, where as before, it would bust off quickly and idle great after having been shut off for an hour or more, all without touching the throttle. It sat less than 10 minutes and didnt start.
It seems to idle up at 1500-2000 rpms after driving (like coming to a stop at the end of a road). I have to punch the throttle and then it idles down to 1000. Just like my old Mercury, but it was normal operating when doing a cold start. It would idle high for a bit, then you kick the gas pedal and it would idle down to normal and was ready to drive. This carburetor is doing it when the truck is at normal operating temperature, after having been driven 20 miles or more! I have replaced the throttle cable, which was old, cracked and was sticking way up after being driven. Although it doesn't stick at nearly as high RPM, I still have to stab the pedal so I'm not running 2000 RPM waiting at an intersection.
It also "diesel's out" and sometimes it makes this loud SHHHH noise just as it finally does go dead. This afternoon when it did that, there was visible smoke as though it had been blown out.
I am obviously quite the novice when it comes to carburetors. Probably 90% of my car history has been with EFI Systems from the 80s-up, and it seems that every carburetor-eqquipped vehicle I buy, it's a persistent problem. The best was my 1983 Mercury Zephyr, and of the 10s of thousands of miles I put on it, it only had an issue in high elevations and low temperatures. But, still, never had that problem in an old 90s Ford Tempo or Honda Accord with EFI.
All that said, I believe this carburetor is a piece of s#¡t. Any insight would be greatly appreciated, guys. And, if a new carburetor is required (I can not afford an EFI setup right now, and do not wish to park the truck in the meantime), please suggest one for me, within a reasonable price range.
Truck details:
1974 Chevrolet C10
250 c.i./4.1L Inline 6
electronic distributor and alternator conversion done by previous owners
3 speed manual
Aftermarket carburetor, probably the cheapest one O'Reilly's had.
Just in case it matters, truck was sold new and still resides in Mississippi, so nothing to do with California-specific emissions equipment.
I will take pictures of the carburetor if need be. Maybe some vacuum hose is wrong. I'm honestly clueless about this stuff (to do with carburetors and so on).
This is not the factory carburetor. It came from O'Reilly auto parts and they couldn't give me much info on it. My cousin bought it, and he was there, but they really had nothing for it. Carburetor is not old, maybe 1-2 years.
Issues:
Will not start in the morning without a shot of gas down it's throat. Fuel pump replaced yesterday with Delphi unit, no help. Fuel filter inspected and cleaned as well.
Now, it doesnt like starting warm without pumping the throttle, where as before, it would bust off quickly and idle great after having been shut off for an hour or more, all without touching the throttle. It sat less than 10 minutes and didnt start.
It seems to idle up at 1500-2000 rpms after driving (like coming to a stop at the end of a road). I have to punch the throttle and then it idles down to 1000. Just like my old Mercury, but it was normal operating when doing a cold start. It would idle high for a bit, then you kick the gas pedal and it would idle down to normal and was ready to drive. This carburetor is doing it when the truck is at normal operating temperature, after having been driven 20 miles or more! I have replaced the throttle cable, which was old, cracked and was sticking way up after being driven. Although it doesn't stick at nearly as high RPM, I still have to stab the pedal so I'm not running 2000 RPM waiting at an intersection.
It also "diesel's out" and sometimes it makes this loud SHHHH noise just as it finally does go dead. This afternoon when it did that, there was visible smoke as though it had been blown out.
I am obviously quite the novice when it comes to carburetors. Probably 90% of my car history has been with EFI Systems from the 80s-up, and it seems that every carburetor-eqquipped vehicle I buy, it's a persistent problem. The best was my 1983 Mercury Zephyr, and of the 10s of thousands of miles I put on it, it only had an issue in high elevations and low temperatures. But, still, never had that problem in an old 90s Ford Tempo or Honda Accord with EFI.
All that said, I believe this carburetor is a piece of s#¡t. Any insight would be greatly appreciated, guys. And, if a new carburetor is required (I can not afford an EFI setup right now, and do not wish to park the truck in the meantime), please suggest one for me, within a reasonable price range.
Truck details:
1974 Chevrolet C10
250 c.i./4.1L Inline 6
electronic distributor and alternator conversion done by previous owners
3 speed manual
Aftermarket carburetor, probably the cheapest one O'Reilly's had.
Just in case it matters, truck was sold new and still resides in Mississippi, so nothing to do with California-specific emissions equipment.
I will take pictures of the carburetor if need be. Maybe some vacuum hose is wrong. I'm honestly clueless about this stuff (to do with carburetors and so on).
