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Engine suddenly quits running #3148364
06/03/23 09:44 AM
06/03/23 09:44 AM
Joined: Jan 2003
Posts: 5,587
Detroit area
6PAX Offline OP
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6PAX  Offline OP
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Detroit area
Several times in the last couple of weeks I have started my engine (340) and left it idling for a bit when it suddenly just dies out. I don't mean a gradual shutting down but rather like someone flipped an on/off switch. When I try to restart it it is stubborn but will eventually restart although in yesterday's episode I had to use starting fluid. I pulled the plugs and most of them were wet. I suspect something is wrong with the carb such as a stuck float as I can also smell gas. I tried tapping on the float bowls with a rubber mallet but I'm not sure if it changed anything. When it is actually idling, it runs and idles fine. Does this sound like the result of a stuck float? Carb is a Holley 770 Street Avenger.

Re: Engine suddenly quits running [Re: 6PAX] #3148384
06/03/23 11:58 AM
06/03/23 11:58 AM
Joined: Oct 2010
Posts: 2,394
Ambridge, Pa.
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rickraw Offline
top fuel
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Ambridge, Pa.
Watch the boosters and see if they start dripping, if may have bad needle n seats. Check the float level with it idleing.

Re: Engine suddenly quits running [Re: rickraw] #3148399
06/03/23 01:23 PM
06/03/23 01:23 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
I Win
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Bend,OR USA
Originally Posted by rickraw
Watch the boosters and see if they start dripping, if may have bad needle n seats. Check the float level with it idleing.
iagree scope
If that isn't it look for an electrical connection causing that problem ,they are called high joints or high resistance opens, not conducting well all the time scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Engine suddenly quits running [Re: Cab_Burge] #3148411
06/03/23 02:08 PM
06/03/23 02:08 PM
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
slantzilla Offline
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slantzilla  Offline
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Park Forest, IL
If the floats were high it would load up before it dies. Sounds more electrical to me. Maybe pickup coil in the distributor.


"Everybody funny, now you funny too."
Re: Engine suddenly quits running [Re: slantzilla] #3148431
06/03/23 03:11 PM
06/03/23 03:11 PM
Joined: Sep 2003
Posts: 19,243
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

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north of coder
look close at the connections on the coil itself.
i chased a problem similar to this one time, and it turned out the wire at the terminal connection [i forget if it was the + or - wire] was broken on the bottom, just being connected by only a few strands of wire to the terminal.
beer

Re: Engine suddenly quits running [Re: moparx] #3148444
06/03/23 03:51 PM
06/03/23 03:51 PM
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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CMcAllister Offline
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Fulton County, PA
Distributor pickup. Ignition control box.

Assuming electronic ignition since no info was provided in OP.


If the results don't match the theory, change the theory.
Re: Engine suddenly quits running [Re: 6PAX] #3148460
06/03/23 05:08 PM
06/03/23 05:08 PM
Joined: Mar 2005
Posts: 546
Stuart FL
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mercman1 Offline
mopar
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Joined: Mar 2005
Posts: 546
Stuart FL
Vaporlocking? Electric or mechanical fuel pump?

Re: Engine suddenly quits running [Re: CMcAllister] #3148487
06/03/23 08:20 PM
06/03/23 08:20 PM
Joined: Jan 2003
Posts: 5,587
Detroit area
6PAX Offline OP
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6PAX  Offline OP
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Posts: 5,587
Detroit area
"Distributor pickup. Ignition control box.

Assuming electronic ignition since no info was provided in OP."

Yes, MP electronic ignition.


"Vaporlocking? Electric or mechanical fuel pump?"

Mechanical fuel pump.

Re: Engine suddenly quits running [Re: 6PAX] #3148494
06/03/23 09:13 PM
06/03/23 09:13 PM
Joined: Jun 2014
Posts: 3,105
Md.
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carnut68 Offline
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Md.
Ballast resister?


America First!
Re: Engine suddenly quits running [Re: carnut68] #3148611
06/04/23 02:06 PM
06/04/23 02:06 PM
Joined: Sep 2003
Posts: 19,243
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

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Posts: 19,243
north of coder
as it's the MP system, does it have the orange or chrome box ?
at one time, the orange box seemed to have all sorts of problems. i don't know if the ones sold today have those problems sorted out or not.
beer

Re: Engine suddenly quits running [Re: moparx] #3148646
06/04/23 05:07 PM
06/04/23 05:07 PM
Joined: May 2016
Posts: 629
Ct
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Wirenut Offline
mopar
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Ct
I have had two autometer tachs do this . Started with the sudden shut off while idling then started backfiring on the return road , but ran great during a pass . Disconnected power and signal and symptoms went away.

Re: Engine suddenly quits running [Re: 6PAX] #3148651
06/04/23 05:23 PM
06/04/23 05:23 PM
Joined: Jan 2003
Posts: 5,435
So Cal
Sinitro Offline
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Sinitro  Offline
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Posts: 5,435
So Cal
There has been an issue with the Holley 770 Avenger carburetors..
Everything can be running fine, shut it down and then it wouldn't start even after several minutes of turning the engine over...
Acting like no spark or no fuel??
This happened on a friends RoadRunner 383 with the 770 Avenger.
I pulled the air cleaner and found that the choke blade was all the way closed even though the engine was warm.
Next I pushed hard on the choke blade back to reopen, hit the key the engine fired rite up..
I installed the Avenger many years back and never had this happen before, the RoadRunner always started rite up..
Don't know why the choke blade was forced closed but this happened a couple of months ago and everything has been fine since...

Juts my $0.02... wink

Re: Engine suddenly quits running [Re: Wirenut] #3148883
06/05/23 01:44 PM
06/05/23 01:44 PM
Joined: Sep 2003
Posts: 19,243
north of coder
moparx Online content
"Butt Crack Bob"
moparx  Online Content
"Butt Crack Bob"

Joined: Sep 2003
Posts: 19,243
north of coder
Originally Posted by Wirenut
I have had two autometer tachs do this . Started with the sudden shut off while idling then started backfiring on the return road , but ran great during a pass . Disconnected power and signal and symptoms went away.





since you mentioned this, i just remembered i have a buddy that had the exact same thing happen last year to his race jeep. he had an autometer tach as well.........
beer







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