75SHARK

Hi,


I have a '67 327/350 car that starts up great in the morning when it's cold, but it takes about 15-20 seconds of continuous cranking to start after the engine is warmed up. Once it's running the car runs great. Could it be some kind of a fuel evaporation issue?

It has the original Holley that was rebuilt a few years ago.

Thank you for any suggestions.


Rob

Frankie the Fink

Does the starter 'drag' when hot ? Or, does the starter work fine but the engine won't 'catch' and start up when hot unless you floor the gas pedal ?

75SHARK

No the starter motor is engaging fine. Flooring the gas makes it start a little quicker but not much.

Kerrmudgeon

Sounds like a fuel delivery problem. Take a look down the carb throat as you open the throttle. Is it squirting right away? Has the car been stored lately? You could try a shot of quickstart when it's warm to see if it fires right away, or see if the choke is partially closed when it's warm. That'll make it hard to start warm, and run rich.

The accelerator pump may not be working either.

Frankie the Fink

Outside chance that it's percolation if this occurs in fairly 'hot' environments. But if it occurs shortly after warm up you prob have something else going on. Kermudgeon may be on to something in his post.

You can always get a Harbor Freight infrared temp gun for about $23 and "shoot" the carb bowls the next time it happens. If the temps are approaching anything over 175* then you are on the edge of percolation.

54greg

My 66 327/37 has the same symptions. I have fought it for the last 8 years. Fuel Perk Here

Does it stink up the garage after a nice drive with gas fumes?

75SHARK

Thanks guys for the relpies. To answer some questions:


It is equally hard to start whether it's hot or cold outside. I drive it on nice days during the winter and it's equally hard to start.

And yes it does stink up the garage with fumes after a drive.

I'll go drive and warm it up today and then try the quikstart trick to see if it willl start any quicker that way. I'll also look to see if the choke is staying partly closed.



Rob

65tripleblack

Flooding due to heat soak/perc. Most Holleys do that these days.

Powershift

Larry

Kerrmudgeon

Only a very quick puff of that stuff....NO MORE!

75SHARK

It used to not and would start up quicker. I'll just give the carb a once over/tune and see if it improves. Not a real big deal. At least it eventually starts!

VaCat33

Rob

I had the same exact problem with my newly acquired 67, also an 327/350 with its original carb. I considered rebuilding but finally decided to switch out the carb for an aluminum Holley 670 Street Avenger. I know that might not be an option if you require originality, but I can honestly say, it totally eliminated the fumes, heat soak/perc and difficult warm starting.

I wrapped up the original carb carefully and perhaps I will revisit a rebuild someday.

Jim

Frankie the Fink

Depends on how much raw gas you have to dump into the intake to get the engine going when the problem occurs. Fuel washing down your cylinder walls over time dilutes the oil and is something to consider...

54greg

I also purchased a new street avenger. Did not solve my problem. Carb still gets hot, gas still perks

Willie'sVette

Man...did I hate my '65 350HP back in the late 60s for this very thing!...whenever I had to restart it, it was, "please start, please"

54greg

Thats really good to know! I thought it was just the changes made to the gas we buy

Donald #31176

One of the first remedies is to plug the intake crossover under the carb and wire open the exhaust flapper.

Westlotorn

pchalpin

I added a carb heat shield and a 1" phenolic spacer last summer. It was a big improvement.

75SHARK

Are you referring to the heat riser?