Hard starting when engine is warmed up [Archive] - Chevelle Tech

: Hard starting when engine is warmed up


modracer
Jun 2nd, 10, 3:40 PM
I have a 1969 Chevelle with a 350 sb, It starts fine when it is cold, when it warms up after driving it and I turn it off and leave it sit for about a half an hour it won't start, I have to crank and crank to get it to start. It has a Edelbrock Performer Series carb. It is a 1406 600 cfm square flange.The choke is working the way it is suppose to. Could it be in the dist. It is a stock dist. Everything worked great until spring and I took it out and thats when it started doing this.

Lilracr
Jun 2nd, 10, 4:04 PM
It could be many things, but the first couple things I would check is the coil, module, and make sure the bowl is overflowing after you shut it off.

Bart42
Jun 2nd, 10, 4:58 PM
Could also be the starter. Heat from the exhaust manifold could be heat soaking the solenoid on the starter, so when it is hot it won't start and when it cools down it will start. This happened to me. Got one of those heat shields and put around the starter and fixed the problem. Car did not do this initially, but happened over time. I also had to change the starter since solenoid plastic had deteriorated due to the heat.

Buzzbomb
Jun 2nd, 10, 11:30 PM
Could also be the starter. Heat from the exhaust manifold could be heat soaking the solenoid on the starter, so when it is hot it won't start and when it cools down it will start. This happened to me. Got one of those heat shields and put around the starter and fixed the problem. Car did not do this initially, but happened over time. I also had to change the starter since solenoid plastic had deteriorated due to the heat.

Same issue here...My car "sounded" OK when cranking, but I don't think it was turning fast enough to kick it on- stock starter, BTW. I added a heat shield, problem solved. That being said, fuel percolation can cause this too, and Edelbrock carbs are famous for percolating fuel.

modracer
Jun 3rd, 10, 11:46 AM
How do you take care of the percolating problem? I called and talked to a tech. guy at edelbrock and he was very rude.

Buzzbomb
Jun 3rd, 10, 1:27 PM
How do you take care of the percolating problem? I called and talked to a tech. guy at edelbrock and he was very rude.

Thicker carb base gasket.

http://www.summitracing.com/parts/EDL-9266

68malibubbc
Jun 3rd, 10, 2:16 PM
In addition to any heat insulating gasket or spacer you might use, you can also use nylon washers under the carb stud nuts so there is no direct metal to metal contact.

Buzzbomb
Jun 3rd, 10, 5:35 PM
In addition to any heat insulating gasket or spacer you might use, you can also use nylon washers under the carb stud nuts so there is no direct metal to metal contact.

That's a great idea! That's why this board is so great..Learn something new every day..

richietables
Jun 3rd, 10, 7:56 PM
I'm going to check this out, too. Mine starts great when cold, but sits for more than 3-5 minutes and it takes some real cranking. Also an Edelbrock carb. Thanks, guys.:thumbsup:

modracer
Jun 4th, 10, 11:25 AM
I'am going to be putting in a mini starter so hope that helps out to. I ordered the gasket set from summit and going to be putting that on also. Thanx Jerry

richietables
Jun 4th, 10, 6:28 PM
Thicker carb base gasket.

http://www.summitracing.com/parts/EDL-9266

Picking this gasket up gave me a great excuse to drive down to Summit in Akron this morning. :D

It makes the warm starts a little easier.:thumbsup: Thanks for the tip.

Buzzbomb
Jun 4th, 10, 7:34 PM
Picking this gasket up gave me a great excuse to drive down to Summit in Akron this morning. :D

It makes the warm starts a little easier.:thumbsup: Thanks for the tip.

Glad it worked out! One thing that adds to this is the lousy gasoline we have today, but not much we can do about that. It seems like it starts bubbling when you just look at it crosseyed :eek:

Lucky Guy..Wish there was a Summit near me :)

richietables
Jun 4th, 10, 8:32 PM
I love living near Summit!:hurray:

modracer
Jun 11th, 10, 11:17 AM
Well I put in a new coil,module,the new gasket from Summit and a mini starter. I did all these when the engine was cold, I started it up and it fired right up. I took it for a long ride to get it warmed up and parked it in the garage, I shut it off and restarted it right away and it started right up. I went out about 1/2 an hour later and had to crank the heck out of it to get it started. Is there a chance that it could be a problem with the fuel pump? I'am just about at wits end with this thing. Like I said the people at Edelbrock are very rude and seems like they don't really care about the problem.

68malibubbc
Jun 11th, 10, 12:06 PM
I assume it cranks nice and fast with your new starter, even after sitting hot.

You said it used to work ok before you took it out. What is "it"? What did you change?

modracer
Jun 11th, 10, 2:14 PM
Like I said I replaced the module,coil, put in a new thicker carb. gasket for the percolating,and a new mini starter. It started right up after I did this when it was cold. I took it out for a 15 min. ride and brought it back. I left it sit for about a 1/2 an hour and when to start it and had to crank it over alot to get it to start. It spins over fast but doesn't start right away.

Buzzbomb
Jun 11th, 10, 7:49 PM
Are you getting any flooding? Percolation is one thing, but an incorrect float level is another. Are the throttle blades wet after you drive it and let it sit, any dripping in the carb bores?

When you start it, do you just start it as you would when it's cold, or do you hold the gas pedal halfway down as sometimes is necessary on a carbed car that might have excess fuel to get rid of (ie. flooding)? If it's your fuel PUMP, I would think it would more than likely cause excess gas to enter the carb. If it's not enough gas, you should at least be able to kick it on for 30 seconds or so until the float bowl runs dry. Easy to check the fuel pump, undo the line and see if if squirts a shot of gas the caliber of your finger into a container. If it does, it's working OK.

modracer
Jun 12th, 10, 2:00 PM
There is no dripping or anything wet, I tried just touching the gas pedal and it seems to start a little easier. I don't think the float level is off because of the fact that it starts right up when it is cold. I ran it and checked the carb. for any dripping and didn't see anything. I will try just touching the gas pedal for aw. Thanx Jerryile and see how that works. I'am going to go to Back To The Fifties Weekend here in St. Paul and maybe talk to a few people there and see what they think. I do appreicate all the response that I have gotten on here, Thanx Jerry