Carburetor/choke valves

Tiny
DANDEE50
  • MEMBER
  • 1985 CHEVROLET VAN
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Will not start but if I tie open bigger valves it starts and runs good.
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Friday, July 6th, 2018 AT 9:43 PM

13 Replies

Tiny
DANDEE50
  • MEMBER
Here is a picture.
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Friday, July 6th, 2018 AT 9:52 PM
Tiny
ASEMASTER6371
  • EXPERT
Good morning.

If you open the choke in the front or the butterfly, will it start?

You may have a bad choke pull off. You are allowing air into the system. The choke may be stuck closed causing a flooded condition.

Roy
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Friday, July 6th, 2018 AT 10:58 PM
Tiny
DANDEE50
  • MEMBER
If I remember right it is already open a little when I start it because I remember putting a little gas in it or spraying starting fluid in it to get it going. But with the back one open it no longer needs to be primed and it starts right away or as soon as I turn key. So they are both open when running.
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Tuesday, July 10th, 2018 AT 4:15 AM
Tiny
DANDEE50
  • MEMBER
So it is possible it might flood and backfire causing a fire? Is that what might happen? I still have not driven it yet.
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Tuesday, July 10th, 2018 AT 4:17 AM
Tiny
DANDEE50
  • MEMBER
And thank you for your reply.
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Tuesday, July 10th, 2018 AT 4:18 AM
Tiny
DANDEE50
  • MEMBER
Was trying to avoid getting a rebuilt one cause it is so expensive but maybe it is time to, to be safe.
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Tuesday, July 10th, 2018 AT 4:23 AM
Tiny
ASEMASTER6371
  • EXPERT
The rear should never be open unless you are at full throttle. The secondaries only open at 3/4 throttle or better.

You will need to either have the carburetor rebuilt or replaced.

Roy

https://www.rockauto.com/en/catalog/chevrolet,1985,g10,5.0l+305cid+v8,1044010,fuel+&+air,carburetor,5904
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+1
Tuesday, July 10th, 2018 AT 4:27 AM
Tiny
DANDEE50
  • MEMBER
I knew something was not right. Thanks man and thanks for link too. Have a great day.
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Tuesday, July 10th, 2018 AT 4:44 AM
Tiny
DANDEE50
  • MEMBER
Oh and I am pretty sure front ones do just that, that is open more the faster you go so that is the working right, correct?
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Tuesday, July 10th, 2018 AT 4:47 AM
Tiny
ASEMASTER6371
  • EXPERT
It should open fully within about two minutes.

Roy
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Tuesday, July 10th, 2018 AT 4:48 AM
Tiny
DANDEE50
  • MEMBER
Got it, thanks again.
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Tuesday, July 10th, 2018 AT 5:18 AM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Feel free to ask any follow up questions. We are glad to help.

Roy
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Tuesday, July 10th, 2018 AT 6:07 AM
Tiny
DANDEE50
  • MEMBER
Thanks Roy, wanted to mention, I do not know what the fuel filter in the carburetor has to do with any of this but I replaced it and when I put the hoses and air cleaner back on the front butterfly valves were open and rear closed and it started and is running good again. Could be some vacuum hoses were in wrong place and I put them back on in the right way. Strange! Anyway if it goes back to doing it again I might not need a mechanic, I might be needing a priest! Have a good one and thanks again.
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Saturday, July 14th, 2018 AT 8:09 PM

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