Engine stalls when put into gear

72Nova383 · #1 (**permalink**) 07-21-2004, 01:23 PM

Hello, first time post here. Done some serches on this subject but im still having some problems. I have a 383 and just put a Holly 670 Street Avenger on it. It has been running great right out of the box. All of sudden like last week its started to idle rough in nuetral and when i put it into drive it stalls. I have checked most of my hoses and ive been looking for a vacume leak but cant seem to find one. Also i have not touched the carb at all just bolted it on. I have looked at the plugs and they seem to be white. any ideas. thanks

Todd

**poncho62** · #2 (**permalink**) 07-21-2004, 01:28 PM

If you had a backfire, you may have blown the power valve in the Holley.

Also, check your float levels.

72Nova383 · #3 (**permalink**) 07-21-2004, 01:30 PM

ok thanks, never has backfired.

**poncho62** · #4 (**permalink**) 07-21-2004, 01:31 PM

Sounds carb related...........................

72Nova383 · #5 (**permalink**) 07-21-2004, 01:52 PM

Would temp outside have anything to do with?? When i put the carb on last month it was cooler outside in the 90's stiill. Now its in the 100's to 113 yesterday.

**poncho62** · #6 (**permalink**) 07-21-2004, 01:53 PM

Could be....Holleys are notorious for temp and weather related changes.

72Nova383 · #7 (**permalink**) 07-21-2004, 11:17 PM

IM going to check my vacuum with a gauge, what should the vacuum pressure be? Also i took it out tonight and it doesnt seem like it had the power it used to have when i got on it before. Could that be a blown power valve? i checked the float bowls and they seem to be alright. thanks for the help.

JamesRS · #8 (**permalink**) 07-22-2004, 12:39 PM

The 670 Avengers have a power valve blowout protection on them. I don't think that is where you problem is. I would double check the vacuum lines, and the idle mixture screws. (get a can of carb cleaner and spray it around the base of the carb while it is running, if the idle smooths out, then it's a vacuum leak)

Another thing, the gas out here in the desert in terribly dirty. If you didn't put a new fuel filter in front of the carb you might have gotten some dirt in one of the idle passages.

Suggestion, turn the idle mixture screws in until they stop, counting the turns as you go. Then back them all the way out and remove the screws. Spray some carb cleaner into the idle screw holes until you see it coming out in the carb venturi area. Do this on both sides, then reinsert the idle screws all the way back in, and back them out the number of turns you counted when you first screwed them in. This should clean out any junk that may have gotten into your idle passages and keep the idle mixture right where it was when you started.

72Nova383 · #9 (**permalink**) 07-22-2004, 01:06 PM

Thanks JamesRS!...good to see someone else from the desert on here. I have a new fuel filter but the gas could be dirty i added octane booster to the 91 octane gas i have in there, could that have something to it? So what else goes on here in the desert as far a hotrodding?

JamesRS · #10 (**permalink**) 07-22-2004, 02:13 PM

Hiya 72Nova383, Good to see another desert dweller. As far as the Desert goes...... COOLING. Today is a perfect example. 113 @ Noon...ouch. I ran a 160 degree thermostat in my Firebird, but sometimes it's was still a challenge to keep it cool. I had a 4 core radiator with electric fans on it and it would still get hot on the hot and humid days out here. The only other issue I ran into was the fuel thing. I change my fuel filters about every year, and they are very dirty when I do. I've had two of them plug up because of the junk in the gas. Other then that the only other thing you have to watch out for is police......hehe.

Speed limits are just suggestions aren't they?

72Nova383 · #11 (**permalink**) 07-22-2004, 03:47 PM

Cool, thanks for the info, ya i run a 160 thermostat and im up at 180-210 which is pretty cool for the desert i think. IS there any speed shops down here?? I only know of the one on Country Club down by the Bermuda Dunes Airport. Where are you located in the desert? im in Indio/La Quinta down 48 ave. see ya..

JamesRS · #12 (**permalink**) 07-22-2004, 05:24 PM

There used to be one out in Thousand palms, but they shut down. I don't know of any others. I'm in Cathedral city off of 30th. L8r.....

72Nova383 · #13 (**permalink**) 07-22-2004, 07:40 PM

Hey James, i just did what you said with the carb spray and idle mixture screws. Didnt seem to change, but when i sprayed the carb cleaner around the base of the carb it did smooth out, i could see it and hear it. So now im off to determine where it might be coming from. Any ideas? i have most of the lines on the carb blocked off. One goes to the vacuum advance and the other is to a pcv valve in the valve cover.

tresi · #14 (**permalink**) 07-22-2004, 08:33 PM

Quote:

Originally posted by 72Nova383
Hey James, i just did what you said with the carb spray and idle mixture screws. Didnt seem to change, but when i sprayed the carb cleaner around the base of the carb it did smooth out, i could see it and hear it. So now im off to determine where it might be coming from. Any ideas? i have most of the lines on the carb blocked off. One goes to the vacuum advance and the other is to a pcv valve in the valve cover.

You've got a vacuum leak.

71 c-10 · #15 (**permalink**) 07-22-2004, 09:25 PM

where ever you sprayed it when it evened out is where the leak is... i would guess a base plate gasket.

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