Home page

Cool! NEW FEATURE! Add "Your Corvette Story" today

C3 Engines

cold starting without choke (1/8)
 8/4/18 5:38am
NJAus
Former Member

Send Private Message

, - Australia

Vette(s):
Currently own a white 1969 427 Big Block Coupe C3 Corvette


Joined: 6/6/2018
Posts: 30

Hi All,

I was wondering what everyones procedure was to cold start their car without choke on a cold morning. Where I live a cold morning would be 46 degrees farenheit.

I pump twice and crank it for 5 secs, and repeat this procedure 3 times minimum until I get the car to fire up and stall, then one more pump it starts fine and about 30 secs of dancing on the throttle.

Should I be cranking it for longer after the first two pumps or keep cranking until it fires up after the initial pumping?

Will cranking it for longer drain my battery? I don't know if my current method is injecting to much fuel into the engine. Its definitely not flooding the engine as there is no overpowering fuel smell and the car does start.

Car is a 69 427. New starter, new plugs, recently rebuilt and tuned quadrajet. The choke coil was stretched so the choke mechanism was removed.

Thanks,

NJ
Our Sponsors help support C3VR
Sponsor Ad

Re: cold starting without choke (2/8)
 8/4/18 10:25pm
73shark
Standard Member
Send Private Message

Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 549

The easiest thing to do would be to get a new choke spring. The starter motor is not a continuous duty motor so it should never be run continuously longer than about 5 seconds or so without a cooling-off period. My experience with GM V8s is that they are very hard to start with no choke at all.

______________

1973 L-82 4 spd

Re: cold starting without choke (3/8)
 8/4/18 11:10pm
F4Gary
Standard Member
Send Private Message

Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.


Joined: 8/26/2006
Posts: 962

Fix the choke.

______________
Re: cold starting without choke (4/8)
 8/5/18 12:55pm
knotacare
Standard Member
Send Private Message

Newark, DE - USA

Vette(s):
1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1977 Yellow (1 of 51 ) L-48 4 spd, 99% original.


Joined: 7/26/2004
Posts: 461

I have a 68 w/ Gen VI 454 with no choke & prefer it that way. The reason being BB"s get so hot that starting one hot with a chock is  PIA.  I usually pump it 3 to 4 times  and it starts right up. When it starts you have to pump it a bit & keep the idle up to around 2k for 15 to 30 seconds or so. Then it's fine for the day because BB's retain heat much more than a SB. I also installed E3 spark plugs that make a difference. Make sure your carb isn't to lean & it's jetted correctly for you altitude.
Alan


|UPDATED|8/5/2018 9:55:59 AM (AZT)|/UPDATED|


______________
                                               
Re: cold starting without choke (5/8)
 8/6/18 4:22pm
art-corvette
Standard Member
Send Private Message

Joined: 8/16/2005
Posts: 241

for a cold start i need full(manual) choke   . i tried with no choke or even half choke but then i  have to keep cranking and cranking..pumping etc.took sometimes long time before getting started .........sometimes the carb got flooded because of that ....so for me full choke works best.

arthur
Re: cold starting without choke (6/8)
 9/11/18 5:12pm
NJAus
Former Member

Send Private Message

, - Australia

Vette(s):
Currently own a white 1969 427 Big Block Coupe C3 Corvette


Joined: 6/6/2018
Posts: 30

As an update, I had a multitude of problems causing issues including
1) Battery that had dropped a cell
2) Distributor not transferring voltage to the spark plugs (cap and rotor were not in good shape)
3) Spark plugs fouled
 
I also put in a new carburettor with electric choke. Choke is probably only set to 1/4 close. Could probably use a bit more closing but it's great improvement.
 
 
 
 
Re: cold starting without choke (7/8)
 9/11/18 8:56pm
73shark
Standard Member
Send Private Message

Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 549

My experience with carbureted Chevy V8s, both big blocks and small blocks, is that they start a lot better when cold with a fully closed choke and one pump. YMMV

______________

1973 L-82 4 spd

Re: cold starting without choke (8/8)
 9/11/18 10:34pm
NJAus
Former Member

Send Private Message

, - Australia

Vette(s):
Currently own a white 1969 427 Big Block Coupe C3 Corvette


Joined: 6/6/2018
Posts: 30

I will probably adjust it to fully closed