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Old 06-07-2006, 10:53 PM
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Engine Stalling and other gremlins

I have a 67 Mustang Coupe 289, Holley 570 street avenger carb, weiand Stealth manifold, 218 Duration cam, HiPo K exhaust manifold into 2" dual exhaust and a C-4 tranny. My problem right now is that when I put it into gear after it is warmed up the RPMs start to slowly decrease until it stalls unless I give it a little throttle or slip it into neutral RPMS come back up to 900. In addition to that my oil pressure starts to drop when the RPM's are below 700. I rebuilt the engine 4 years ago but only drove for about 5k miles before it sat for about 2 years I ran it every few weeks. The carb and intake have only been on the engine for about 600 miles. The carb's vacuum advance port is not pulling any vacuum at idle which may account for the stalling spent 3 hours trying to adjust it to get the vacuum to increase. Any suggestions or ideas are welcome I'm running out of them.

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Old 06-08-2006, 02:41 AM
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Wait... not pulling any vacuum? Where'd you get the carb? (Was it rebuilt and out of the box or did you pull it off of another car and never rebuild it or...?) Get the vacuum working. My '65 would stall under load, but there was alot more to it than that (interior of my C4 was trashed and things like that). Maybe Docvette will sign on soon and you'll get lucky!
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Old 06-08-2006, 07:03 AM
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Quote:
Originally Posted by PJMustang67
I have a 67 Mustang Coupe 289, Holley 570 street avenger carb, weiand Stealth manifold, 218 Duration cam, HiPo K exhaust manifold into 2" dual exhaust and a C-4 tranny. My problem right now is that when I put it into gear after it is warmed up the RPMs start to slowly decrease until it stalls unless I give it a little throttle or slip it into neutral RPMS come back up to 900. In addition to that my oil pressure starts to drop when the RPM's are below 700. I rebuilt the engine 4 years ago but only drove for about 5k miles before it sat for about 2 years I ran it every few weeks. The carb and intake have only been on the engine for about 600 miles. The carb's vacuum advance port is not pulling any vacuum at idle which may account for the stalling spent 3 hours trying to adjust it to get the vacuum to increase. Any suggestions or ideas are welcome I'm running out of them.
r u sure that its not ported (pulls vacuum on accel)??? put a guage on the port and rev the motor, if it pulls vacuum on accel, then ur on a ported vacuum. and its pretty common to have it hooked up that way... u can try running full vacuum and adjust ur timing from there... gl.
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Old 06-09-2006, 11:17 AM
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It's a brand new Holley out of the box. I have to run the RPM's fairly high before it pulls any vacuum. The port is the designated vacuum for the spark advance. I got through to Holley Tech they said to pull it off and back out a screw adjuster underneath the secondarys. Can't get to it while it's mounted. I"ll try that today. I also got a rod knocking I'm hoping it's just not torqued down enough. Get close to getting evrything right and something always comes up to keep you busy. Try doing heavy maintenance with a 3 and 7 year old running around. Until her legs get long enough I can't get her help with the car.
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Old 06-09-2006, 12:02 PM
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been there done that Holley street avenger is the worst carb I've seen
had a 670 after three power valves new bowl sights(the clear ones are for temp. us) and a rebuild i called the 1-800 # in the instructions the guy told me that the 670 flows air more like a 550 my response was how could you market the thing as a 670 then he would not answer told me to send him the carb(to Tennessee!!) on my dime and he would fix it!! never again ill rebuild an old Holley or get A B.G.
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