Question about starting
Thread Starter
Instructor
Joined: May 2019
Posts: 153
Likes: 15
From: CT
Question about starting
Hello! On my 79 L82 I have an issue with starting.
I pump the gas once, then twice, and on the third one I hold it down and release slowly. I crank the car over for about 3 seconds and the car fires right up. The only issue is I need to feather the gas pedal in order to keep it idling until the car is warmed up. Once it is warmed up, it idles fine, no need to feather the gas pedal. It also high idles (until it is warmed up) and I hit the gas to bring the rpms down to idling rpms. After the initial warmup (while feathering the gas) if I turn car off then restart the car just fine with not feathering the gas pedal and it fires right up. After the initial warm up, it starts just fine throughout the day with no problems at all.
I have an original, rebuilt roch carb and it seems to only be an issue on cold startup. I have to feather the gas pedal, after pumping 3 times, in order for it to warm up. Also, during this time period I have very strong fuel smells coming from the exhaust which stinks up the garage. Any ideas or help? Thank you!
I pump the gas once, then twice, and on the third one I hold it down and release slowly. I crank the car over for about 3 seconds and the car fires right up. The only issue is I need to feather the gas pedal in order to keep it idling until the car is warmed up. Once it is warmed up, it idles fine, no need to feather the gas pedal. It also high idles (until it is warmed up) and I hit the gas to bring the rpms down to idling rpms. After the initial warmup (while feathering the gas) if I turn car off then restart the car just fine with not feathering the gas pedal and it fires right up. After the initial warm up, it starts just fine throughout the day with no problems at all.
I have an original, rebuilt roch carb and it seems to only be an issue on cold startup. I have to feather the gas pedal, after pumping 3 times, in order for it to warm up. Also, during this time period I have very strong fuel smells coming from the exhaust which stinks up the garage. Any ideas or help? Thank you!
Le Mans Master
Joined: Jun 2019
Posts: 7,658
Likes: 2,470
From: Indiana
Hello! On my 79 L82 I have an issue with starting.
I pump the gas once, then twice, and on the third one I hold it down and release slowly. I crank the car over for about 3 seconds and the car fires right up. The only issue is I need to feather the gas pedal in order to keep it idling until the car is warmed up. Once it is warmed up, it idles fine, no need to feather the gas pedal. It also high idles (until it is warmed up) and I hit the gas to bring the rpms down to idling rpms. After the initial warmup (while feathering the gas) if I turn car off then restart the car just fine with not feathering the gas pedal and it fires right up. After the initial warm up, it starts just fine throughout the day with no problems at all.
I have an original, rebuilt roch carb and it seems to only be an issue on cold startup. I have to feather the gas pedal, after pumping 3 times, in order for it to warm up. Also, during this time period I have very strong fuel smells coming from the exhaust which stinks up the garage. Any ideas or help? Thank you!
I pump the gas once, then twice, and on the third one I hold it down and release slowly. I crank the car over for about 3 seconds and the car fires right up. The only issue is I need to feather the gas pedal in order to keep it idling until the car is warmed up. Once it is warmed up, it idles fine, no need to feather the gas pedal. It also high idles (until it is warmed up) and I hit the gas to bring the rpms down to idling rpms. After the initial warmup (while feathering the gas) if I turn car off then restart the car just fine with not feathering the gas pedal and it fires right up. After the initial warm up, it starts just fine throughout the day with no problems at all.
I have an original, rebuilt roch carb and it seems to only be an issue on cold startup. I have to feather the gas pedal, after pumping 3 times, in order for it to warm up. Also, during this time period I have very strong fuel smells coming from the exhaust which stinks up the garage. Any ideas or help? Thank you!
releasing pedal slowly IMO does nothing..
Last edited by interpon; Mar 12, 2021 at 01:53 PM.
Thread Starter
Instructor
Joined: May 2019
Posts: 153
Likes: 15
From: CT
Choke seems to work. I pump the pedal once to set the choke and it opens slightly (maybe 1/4 of an inch). After the first pump (to set the choke) I pump it again to give it a squirt of gas. After that I have to feather the gas to keep it going until it is warmed up. Once the vette is warm, after high idle, I can turn it off and on throughout the day without feathering the gas. Thank you for your responses!
Thread Starter
Instructor
Joined: May 2019
Posts: 153
Likes: 15
From: CT
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
The choke pulloff should crack the choke open 1/4" as measured from the forward, lower edge of the choke plate to the airhorn wall, but set it to whatever spec you need to make the engine idle reliably by itself upon cold start. This should have been set and tested by the carb builder.
Lars
Lars
