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Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367448 Thu Jul 02 2020 02:12 PM
Joined: Dec 2016
Posts: 14
L
Lawman Offline OP
New Guy
Yes, I ran the old gas near empty and put new in. All the bolts are tight, manifold and carb mountings. It does have power front discs (installed about 3 years ago) that vacuum hose is installed with hose clamps on both ends. Hose to PCV valve is snug on both ends. I’ve had the timing as high as 10 degrees while working this issue. For years it was set at 8 degrees (I thought it was 4, misreading the timing marks as 1 degree instead of 2). I moved it to six degree because Bartamos suggested that was spec and I wanted to base line the engine to solve the idle issue.

Lawman

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367451 Thu Jul 02 2020 02:32 PM
Joined: Dec 2016
Posts: 14
L
Lawman Offline OP
New Guy
Any chance a bad PCV could be the culprit?

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367515 Fri Jul 03 2020 01:03 AM
Joined: Mar 2010
Posts: 9,387
5
Master Gabster
Where ever you have a vacuum line, remove the vacuum line and put rubber caps on for testing purposes. This will eliminate the possibility of a vacuum leak from a faulty vacuum activated device.

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367592 Fri Jul 03 2020 06:00 PM
Joined: Dec 2016
Posts: 14
L
Lawman Offline OP
New Guy
Alright, I’m now convinced no adjustment I can make in timing, idle speed, or mixture will fix this problem. All the vacuums seem solid, all the carb screws, bolts and manifold bolts are tight. I think the gas supply is good and the pump is new. So, I’m going to take the Rochester off, clean and probably rebuild it. There must be something stopped up or flow restricted somewhere. Thanks for all your help everyone.

Lawman

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367597 Fri Jul 03 2020 06:38 PM
Joined: May 2005
Posts: 7,347
B
General Purpose
I don't expect you to do this. There are a few of us who could do this and have done this. BUT............if you could hook up a clean gas can on the passenger's floor and run the hose thru firewall to the fuel pump inlet, it would sure eliminate a lot of possibilities. It would point to pump or carb.


I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.


Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367726 Sat Jul 04 2020 05:04 PM
Joined: Dec 2016
Posts: 14
L
Lawman Offline OP
New Guy
Thanks, but I don’t see what that would accomplish. I’ve already replaced the fuel pump early in this effort because I noticed it had a little drip leak. So that is already new and seems to be pumping, I can see the gas pulsing through the glass in line filter just in front of the pump inlet. The tank itself is about 5 years old, all gas lines are new within the last year including the sending unit and it’s filter sock. I treated the gas with sea foam and ran the gas in the tank nearly empty and replaced with fresh from a different station a few days ago. It doesn’t feel like a fuel supply problem.

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367732 Sat Jul 04 2020 05:42 PM
Joined: Apr 2005
Posts: 8,909
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
As Carl says “It’s never the carburetor.......until it’s the carburetor “. It’s time to dig into that Rochester and see what’s happening.🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
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Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367805 Sun Jul 05 2020 02:14 AM
Joined: Mar 2004
Posts: 4,605
M
Shop Shark
Could there be an electrical problem where the coil is grounding out when you stop?

A simple test would be to connect a test light to the + terminal on the coil and to Ground...make the test leads long enough so the light is visible from the drivers seat and take it for a ride and see if the light goes out when you stop...

Grabbing straws here...

Mike B smile

Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367808 Sun Jul 05 2020 02:43 AM
Joined: Jun 2011
Posts: 3,597
Shop Shark
That was what I thought, but he didn't think so.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 66 Chevy 250 dies at stop signs and red lights....help
Lawman #1367828 Sun Jul 05 2020 01:00 PM
Joined: Mar 2019
Posts: 950
G
Shop Shark
Sounds like a likely possibility. Should definitely be checked.

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